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mul256x256_256.wasm32.wat
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mul256x256_256.wasm32.wat
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(module
(memory 1)
(export "test" (func $test))
;; a = 0xaf6ed231c2b3174026b9fd3c903cde23dca5f06a04da8d06355a814a872d1782
;; b = 0x8ab8a663f6ba95916fbee2af731a6cc455ed5388343c8d226bc7232f315c2561
;; out_expected = 0x5ddcdd124d5f7664eedd3c724d9502470144bbfdd2c467a49e2f0f591133b242
(data (;0;) (i32.const 64) "\82\17\2d\87\4a\81\5a\35\06\8d\da\04\6a\f0\a5\dc\23\de\3c\90\3c\fd\b9\26\40\17\b3\c2\31\d2\6e\af")
(data (;0;) (i32.const 96) "\61\25\5c\31\2f\23\c7\6b\22\8d\3c\34\88\53\ed\55\c4\6c\1a\73\af\e2\be\6f\91\95\ba\f6\63\a6\b8\8a")
(func $test (result i64)
(local i64) ;; this local is returned to show which limb failed
i64.const 0
i64.const 64
i64.const 96
call $mul256x256_256
;; compare output to expected
block
;; test limb 0
(i32.ne (i32.load (i32.const 0)) (i32.const 288600642))
br_if 0
(local.set 0 (i64.add (i64.const 1)(local.get 0))) ;;increment
;; test limb 1
(i32.ne (i32.load (i32.const 4)) (i32.const 2653884249))
br_if 0
(local.set 0 (i64.add (i64.const 1)(local.get 0))) ;;increment
;; test limb 2
(i32.ne (i32.load (i32.const 8)) (i32.const 3536086948))
br_if 0
(local.set 0 (i64.add (i64.const 1)(local.get 0))) ;;increment
;; test limb 3
(i32.ne (i32.load (i32.const 12)) (i32.const 21281789))
br_if 0
(local.set 0 (i64.add (i64.const 1)(local.get 0))) ;;increment
;; test limb 4
(i32.ne (i32.load (i32.const 16)) (i32.const 1301611079))
br_if 0
(local.set 0 (i64.add (i64.const 1)(local.get 0))) ;;increment
;; test limb 5
(i32.ne (i32.load (i32.const 20)) (i32.const 4007476338))
br_if 0
(local.set 0 (i64.add (i64.const 1)(local.get 0))) ;;increment
;; test limb 6
(i32.ne (i32.load (i32.const 24)) (i32.const 1298101860))
br_if 0
(local.set 0 (i64.add (i64.const 1)(local.get 0))) ;;increment
;; test limb 7
(i32.ne (i32.load (i32.const 28)) (i32.const 1574755602))
br_if 0
(local.set 0 (i64.add (i64.const 1)(local.get 0))) ;;increment
end
local.get 0 ;;return index where failed, or num_limbs if it passed
;;(i64.load (i32.const 0))
;;(i64.and (i64.load (i32.const 8)) (i64.const 0xffffffff)) ;; lower 32-bits
)
(func $mul256x256_256 (param i64 i64 i64)
(local i64 i64 i64 i64 i64 i64 i64 i64 i64 i64 i64)
;; bring a,b into locals 6-13
(i64.load (i32.wrap/i64 (i64.add (local.get 1) (i64.const 0)))) (local.set 6)
(i64.load (i32.wrap/i64 (i64.add (local.get 1) (i64.const 8)))) (local.set 7)
(i64.load (i32.wrap/i64 (i64.add (local.get 1) (i64.const 16)))) (local.set 8)
(i64.load (i32.wrap/i64 (i64.add (local.get 1) (i64.const 24)))) (local.set 9)
(i64.load (i32.wrap/i64 (i64.add (local.get 2) (i64.const 0)))) (local.set 10)
(i64.load (i32.wrap/i64 (i64.add (local.get 2) (i64.const 8)))) (local.set 11)
(i64.load (i32.wrap/i64 (i64.add (local.get 2) (i64.const 16)))) (local.set 12)
(i64.load (i32.wrap/i64 (i64.add (local.get 2) (i64.const 24)))) (local.set 13)
;; zero things
(local.set 1 (i64.const 0))
(local.set 2 (i64.const 0))
;; done initializing, now let's compute something
;; a0*b0 + carry
;; a0*b0
(local.set 5 (local.get 6)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; write result for this limb, prepare for next limb
(i32.store (i32.wrap/i64 (i64.add (local.get 0) (i64.const 0))) (i32.wrap/i64 (local.get 1)) ) ;; write result for this 32-bit limb
(i64.shr_u (local.get 1) (i64.const 32)) (local.set 1) ;; the upper 32-bits is carry
(i64.shl (local.get 2) (i64.const 32)) (local.set 2) ;; overflow is in upper 32-bits
(i64.add (local.get 1) (local.get 2)) (local.set 1) ;; add overflow of carry
(local.set 2 (i64.const 0)) ;; re-init overflow to zero
;; a0*b1 + a1*b0 + carry
;; a0*b1
(local.set 5 (local.get 6)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a1*b0
(local.set 5 (local.get 6)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; write result for this limb, prepare for next limb
(i32.store (i32.wrap/i64 (i64.add (local.get 0) (i64.const 4))) (i32.wrap/i64 (local.get 1)) ) ;; write result for this 32-bit limb
(i64.shr_u (local.get 1) (i64.const 32)) (local.set 1) ;; the upper 32-bits is carry
(i64.shl (local.get 2) (i64.const 32)) (local.set 2) ;; overflow is in upper 32-bits
(i64.add (local.get 1) (local.get 2)) (local.set 1) ;; add overflow of carry
(local.set 2 (i64.const 0)) ;; re-init overflow to zero
;; a0*b2 + a1*b1 + a2*b0 + carry
;; a0*b2
(local.set 5 (local.get 6)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a1*b1
(local.set 5 (local.get 6)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a2*b0
(local.set 5 (local.get 7)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; write result for this limb, prepare for next limb
(i32.store (i32.wrap/i64 (i64.add (local.get 0) (i64.const 8))) (i32.wrap/i64 (local.get 1)) ) ;; write result for this 32-bit limb
(i64.shr_u (local.get 1) (i64.const 32)) (local.set 1) ;; the upper 32-bits is carry
(i64.shl (local.get 2) (i64.const 32)) (local.set 2) ;; overflow is in upper 32-bits
(i64.add (local.get 1) (local.get 2)) (local.set 1) ;; add overflow of carry
(local.set 2 (i64.const 0)) ;; re-init overflow to zero
;; a0*b3 + a1*b2 + a2*b1 + a3*b0 + carry
;; a0*b3
(local.set 5 (local.get 6)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a1*b2
(local.set 5 (local.get 6)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a2*b1
(local.set 5 (local.get 7)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a3*b0
(local.set 5 (local.get 7)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; write result for this limb, prepare for next limb
(i32.store (i32.wrap/i64 (i64.add (local.get 0) (i64.const 12))) (i32.wrap/i64 (local.get 1)) ) ;; write result for this 32-bit limb
(i64.shr_u (local.get 1) (i64.const 32)) (local.set 1) ;; the upper 32-bits is carry
(i64.shl (local.get 2) (i64.const 32)) (local.set 2) ;; overflow is in upper 32-bits
(i64.add (local.get 1) (local.get 2)) (local.set 1) ;; add overflow of carry
(local.set 2 (i64.const 0)) ;; re-init overflow to zero
;; a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0 + carry
;; a0*b4
(local.set 5 (local.get 6)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 12)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a1*b3
(local.set 5 (local.get 6)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a2*b2
(local.set 5 (local.get 7)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a3*b1
(local.set 5 (local.get 7)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a4*b0
(local.set 5 (local.get 8)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; write result for this limb, prepare for next limb
(i32.store (i32.wrap/i64 (i64.add (local.get 0) (i64.const 16))) (i32.wrap/i64 (local.get 1)) ) ;; write result for this 32-bit limb
(i64.shr_u (local.get 1) (i64.const 32)) (local.set 1) ;; the upper 32-bits is carry
(i64.shl (local.get 2) (i64.const 32)) (local.set 2) ;; overflow is in upper 32-bits
(i64.add (local.get 1) (local.get 2)) (local.set 1) ;; add overflow of carry
(local.set 2 (i64.const 0)) ;; re-init overflow to zero
;; a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0 + carry
;; a0*b5
(local.set 5 (local.get 6)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 12)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a1*b4
(local.set 5 (local.get 6)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 12)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a2*b3
(local.set 5 (local.get 7)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a3*b2
(local.set 5 (local.get 7)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a4*b1
(local.set 5 (local.get 8)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a5*b0
(local.set 5 (local.get 8)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; write result for this limb, prepare for next limb
(i32.store (i32.wrap/i64 (i64.add (local.get 0) (i64.const 20))) (i32.wrap/i64 (local.get 1)) ) ;; write result for this 32-bit limb
(i64.shr_u (local.get 1) (i64.const 32)) (local.set 1) ;; the upper 32-bits is carry
(i64.shl (local.get 2) (i64.const 32)) (local.set 2) ;; overflow is in upper 32-bits
(i64.add (local.get 1) (local.get 2)) (local.set 1) ;; add overflow of carry
(local.set 2 (i64.const 0)) ;; re-init overflow to zero
;; a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0 + carry
;; a0*b6
(local.set 5 (local.get 6)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 13)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a1*b5
(local.set 5 (local.get 6)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 12)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a2*b4
(local.set 5 (local.get 7)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 12)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a3*b3
(local.set 5 (local.get 7)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a4*b2
(local.set 5 (local.get 8)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a5*b1
(local.set 5 (local.get 8)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a6*b0
(local.set 5 (local.get 9)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; write result for this limb, prepare for next limb
(i32.store (i32.wrap/i64 (i64.add (local.get 0) (i64.const 24))) (i32.wrap/i64 (local.get 1)) ) ;; write result for this 32-bit limb
(i64.shr_u (local.get 1) (i64.const 32)) (local.set 1) ;; the upper 32-bits is carry
(i64.shl (local.get 2) (i64.const 32)) (local.set 2) ;; overflow is in upper 32-bits
(i64.add (local.get 1) (local.get 2)) (local.set 1) ;; add overflow of carry
(local.set 2 (i64.const 0)) ;; re-init overflow to zero
;; a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0 + carry
;; a0*b7
(local.set 5 (local.get 6)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 13)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a1*b6
(local.set 5 (local.get 6)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 13)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a2*b5
(local.set 5 (local.get 7)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 12)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a3*b4
(local.set 5 (local.get 7)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 12)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a4*b3
(local.set 5 (local.get 8)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a5*b2
(local.set 5 (local.get 8)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 11)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a6*b1
(local.set 5 (local.get 9)) ;; bring a to workspace
(i32.wrap/i64 (local.get 5)) (i64.extend_i32_u) (local.set 5) ;; get lower 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i64.shr_u (local.get 4) (i64.const 32)) (local.set 4) ;; get upper 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; a7*b0
(local.set 5 (local.get 9)) ;; bring a to workspace
(i64.shr_u (local.get 5) (i64.const 32)) (local.set 5) ;; get upper 32-bits
(local.set 4 (local.get 10)) ;; bring b to workspace
(i32.wrap/i64 (local.get 4)) (i64.extend_i32_u) (local.set 4) ;; get lower 32-bits
(i64.mul (local.get 4) (local.get 5)) (local.set 4) ;; multiply
(local.set 3 (local.get 4)) ;; remove dependancy from local 4
(i64.add (local.get 3) (local.get 1)) (local.set 1) ;; add to accumulator t1
(i64.gt_u (local.get 3) (local.get 1)) (local.set 3 (i64.extend_i32_u)) ;; compare l1 and t3
(i64.add (local.get 2) (local.get 3)) (local.set 2) ;; add to overflow, even if add zero
;; write result for this limb, prepare for next limb
(i32.store (i32.wrap/i64 (i64.add (local.get 0) (i64.const 28))) (i32.wrap/i64 (local.get 1)) ) ;; write result for this 32-bit limb
(i64.shr_u (local.get 1) (i64.const 32)) (local.set 1) ;; the upper 32-bits is carry
(i64.shl (local.get 2) (i64.const 32)) (local.set 2) ;; overflow is in upper 32-bits
(i64.add (local.get 1) (local.get 2)) (local.set 1) ;; add overflow of carry
(local.set 2 (i64.const 0)) ;; re-init overflow to zero
)
)