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asm_amd64p32.s
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "go_asm.h"
#include "go_tls.h"
#include "funcdata.h"
#include "textflag.h"
TEXT runtime·rt0_go(SB),NOSPLIT,$0
// copy arguments forward on an even stack
MOVL argc+0(FP), AX
MOVL argv+4(FP), BX
MOVL SP, CX
SUBL $128, SP // plenty of scratch
ANDL $~15, CX
MOVL CX, SP
MOVL AX, 16(SP)
MOVL BX, 24(SP)
// create istack out of the given (operating system) stack.
MOVL $runtime·g0(SB), DI
LEAL (-64*1024+104)(SP), BX
MOVL BX, g_stackguard0(DI)
MOVL BX, g_stackguard1(DI)
MOVL BX, (g_stack+stack_lo)(DI)
MOVL SP, (g_stack+stack_hi)(DI)
// find out information about the processor we're on
MOVQ $0, AX
CPUID
CMPQ AX, $0
JE nocpuinfo
MOVQ $1, AX
CPUID
MOVL CX, runtime·cpuid_ecx(SB)
MOVL DX, runtime·cpuid_edx(SB)
nocpuinfo:
needtls:
LEAL runtime·tls0(SB), DI
CALL runtime·settls(SB)
// store through it, to make sure it works
get_tls(BX)
MOVQ $0x123, g(BX)
MOVQ runtime·tls0(SB), AX
CMPQ AX, $0x123
JEQ 2(PC)
MOVL AX, 0 // abort
ok:
// set the per-goroutine and per-mach "registers"
get_tls(BX)
LEAL runtime·g0(SB), CX
MOVL CX, g(BX)
LEAL runtime·m0(SB), AX
// save m->g0 = g0
MOVL CX, m_g0(AX)
// save m0 to g0->m
MOVL AX, g_m(CX)
CLD // convention is D is always left cleared
CALL runtime·check(SB)
MOVL 16(SP), AX // copy argc
MOVL AX, 0(SP)
MOVL 24(SP), AX // copy argv
MOVL AX, 4(SP)
CALL runtime·args(SB)
CALL runtime·osinit(SB)
CALL runtime·schedinit(SB)
// create a new goroutine to start program
MOVL $runtime·mainPC(SB), AX // entry
MOVL $0, 0(SP)
MOVL AX, 4(SP)
CALL runtime·newproc(SB)
// start this M
CALL runtime·mstart(SB)
MOVL $0xf1, 0xf1 // crash
RET
DATA runtime·mainPC+0(SB)/4,$runtime·main(SB)
GLOBL runtime·mainPC(SB),RODATA,$4
TEXT runtime·breakpoint(SB),NOSPLIT,$0-0
INT $3
RET
TEXT runtime·asminit(SB),NOSPLIT,$0-0
// No per-thread init.
RET
/*
* go-routine
*/
// void gosave(Gobuf*)
// save state in Gobuf; setjmp
TEXT runtime·gosave(SB), NOSPLIT, $0-4
MOVL buf+0(FP), AX // gobuf
LEAL buf+0(FP), BX // caller's SP
MOVL BX, gobuf_sp(AX)
MOVL 0(SP), BX // caller's PC
MOVL BX, gobuf_pc(AX)
MOVL $0, gobuf_ctxt(AX)
MOVQ $0, gobuf_ret(AX)
get_tls(CX)
MOVL g(CX), BX
MOVL BX, gobuf_g(AX)
RET
// void gogo(Gobuf*)
// restore state from Gobuf; longjmp
TEXT runtime·gogo(SB), NOSPLIT, $0-4
MOVL buf+0(FP), BX // gobuf
MOVL gobuf_g(BX), DX
MOVL 0(DX), CX // make sure g != nil
get_tls(CX)
MOVL DX, g(CX)
MOVL gobuf_sp(BX), SP // restore SP
MOVL gobuf_ctxt(BX), DX
MOVQ gobuf_ret(BX), AX
MOVL $0, gobuf_sp(BX) // clear to help garbage collector
MOVQ $0, gobuf_ret(BX)
MOVL $0, gobuf_ctxt(BX)
MOVL gobuf_pc(BX), BX
JMP BX
// func mcall(fn func(*g))
// Switch to m->g0's stack, call fn(g).
// Fn must never return. It should gogo(&g->sched)
// to keep running g.
TEXT runtime·mcall(SB), NOSPLIT, $0-4
MOVL fn+0(FP), DI
get_tls(CX)
MOVL g(CX), AX // save state in g->sched
MOVL 0(SP), BX // caller's PC
MOVL BX, (g_sched+gobuf_pc)(AX)
LEAL fn+0(FP), BX // caller's SP
MOVL BX, (g_sched+gobuf_sp)(AX)
MOVL AX, (g_sched+gobuf_g)(AX)
// switch to m->g0 & its stack, call fn
MOVL g(CX), BX
MOVL g_m(BX), BX
MOVL m_g0(BX), SI
CMPL SI, AX // if g == m->g0 call badmcall
JNE 3(PC)
MOVL $runtime·badmcall(SB), AX
JMP AX
MOVL SI, g(CX) // g = m->g0
MOVL (g_sched+gobuf_sp)(SI), SP // sp = m->g0->sched.sp
PUSHQ AX
MOVL DI, DX
MOVL 0(DI), DI
CALL DI
POPQ AX
MOVL $runtime·badmcall2(SB), AX
JMP AX
RET
// systemstack_switch is a dummy routine that systemstack leaves at the bottom
// of the G stack. We need to distinguish the routine that
// lives at the bottom of the G stack from the one that lives
// at the top of the system stack because the one at the top of
// the system stack terminates the stack walk (see topofstack()).
TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0
RET
// func systemstack(fn func())
TEXT runtime·systemstack(SB), NOSPLIT, $0-4
MOVL fn+0(FP), DI // DI = fn
get_tls(CX)
MOVL g(CX), AX // AX = g
MOVL g_m(AX), BX // BX = m
MOVL m_gsignal(BX), DX // DX = gsignal
CMPL AX, DX
JEQ noswitch
MOVL m_g0(BX), DX // DX = g0
CMPL AX, DX
JEQ noswitch
MOVL m_curg(BX), R8
CMPL AX, R8
JEQ switch
// Not g0, not curg. Must be gsignal, but that's not allowed.
// Hide call from linker nosplit analysis.
MOVL $runtime·badsystemstack(SB), AX
CALL AX
switch:
// save our state in g->sched. Pretend to
// be systemstack_switch if the G stack is scanned.
MOVL $runtime·systemstack_switch(SB), SI
MOVL SI, (g_sched+gobuf_pc)(AX)
MOVL SP, (g_sched+gobuf_sp)(AX)
MOVL AX, (g_sched+gobuf_g)(AX)
// switch to g0
MOVL DX, g(CX)
MOVL (g_sched+gobuf_sp)(DX), SP
// call target function
MOVL DI, DX
MOVL 0(DI), DI
CALL DI
// switch back to g
get_tls(CX)
MOVL g(CX), AX
MOVL g_m(AX), BX
MOVL m_curg(BX), AX
MOVL AX, g(CX)
MOVL (g_sched+gobuf_sp)(AX), SP
MOVL $0, (g_sched+gobuf_sp)(AX)
RET
noswitch:
// already on m stack, just call directly
MOVL DI, DX
MOVL 0(DI), DI
CALL DI
RET
/*
* support for morestack
*/
// Called during function prolog when more stack is needed.
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must
// record an argument size. For that purpose, it has no arguments.
TEXT runtime·morestack(SB),NOSPLIT,$0-0
get_tls(CX)
MOVL g(CX), BX
MOVL g_m(BX), BX
// Cannot grow scheduler stack (m->g0).
MOVL m_g0(BX), SI
CMPL g(CX), SI
JNE 2(PC)
MOVL 0, AX
// Cannot grow signal stack (m->gsignal).
MOVL m_gsignal(BX), SI
CMPL g(CX), SI
JNE 2(PC)
MOVL 0, AX
// Called from f.
// Set m->morebuf to f's caller.
MOVL 8(SP), AX // f's caller's PC
MOVL AX, (m_morebuf+gobuf_pc)(BX)
LEAL 16(SP), AX // f's caller's SP
MOVL AX, (m_morebuf+gobuf_sp)(BX)
get_tls(CX)
MOVL g(CX), SI
MOVL SI, (m_morebuf+gobuf_g)(BX)
// Set g->sched to context in f.
MOVL 0(SP), AX // f's PC
MOVL AX, (g_sched+gobuf_pc)(SI)
MOVL SI, (g_sched+gobuf_g)(SI)
LEAL 8(SP), AX // f's SP
MOVL AX, (g_sched+gobuf_sp)(SI)
MOVL DX, (g_sched+gobuf_ctxt)(SI)
// Call newstack on m->g0's stack.
MOVL m_g0(BX), BX
MOVL BX, g(CX)
MOVL (g_sched+gobuf_sp)(BX), SP
CALL runtime·newstack(SB)
MOVL $0, 0x1003 // crash if newstack returns
RET
// morestack trampolines
TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0
MOVL $0, DX
JMP runtime·morestack(SB)
TEXT runtime·stackBarrier(SB),NOSPLIT,$0
// We came here via a RET to an overwritten return PC.
// AX may be live. Other registers are available.
// Get the original return PC, g.stkbar[g.stkbarPos].savedLRVal.
get_tls(CX)
MOVL g(CX), CX
MOVL (g_stkbar+slice_array)(CX), DX
MOVL g_stkbarPos(CX), BX
IMULL $stkbar__size, BX // Too big for SIB.
ADDL DX, BX
MOVL stkbar_savedLRVal(BX), BX
// Record that this stack barrier was hit.
ADDL $1, g_stkbarPos(CX)
// Jump to the original return PC.
JMP BX
// reflectcall: call a function with the given argument list
// func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32).
// we don't have variable-sized frames, so we use a small number
// of constant-sized-frame functions to encode a few bits of size in the pc.
// Caution: ugly multiline assembly macros in your future!
#define DISPATCH(NAME,MAXSIZE) \
CMPL CX, $MAXSIZE; \
JA 3(PC); \
MOVL $NAME(SB), AX; \
JMP AX
// Note: can't just "JMP NAME(SB)" - bad inlining results.
TEXT reflect·call(SB), NOSPLIT, $0-0
JMP ·reflectcall(SB)
TEXT ·reflectcall(SB), NOSPLIT, $0-20
MOVLQZX argsize+12(FP), CX
DISPATCH(runtime·call16, 16)
DISPATCH(runtime·call32, 32)
DISPATCH(runtime·call64, 64)
DISPATCH(runtime·call128, 128)
DISPATCH(runtime·call256, 256)
DISPATCH(runtime·call512, 512)
DISPATCH(runtime·call1024, 1024)
DISPATCH(runtime·call2048, 2048)
DISPATCH(runtime·call4096, 4096)
DISPATCH(runtime·call8192, 8192)
DISPATCH(runtime·call16384, 16384)
DISPATCH(runtime·call32768, 32768)
DISPATCH(runtime·call65536, 65536)
DISPATCH(runtime·call131072, 131072)
DISPATCH(runtime·call262144, 262144)
DISPATCH(runtime·call524288, 524288)
DISPATCH(runtime·call1048576, 1048576)
DISPATCH(runtime·call2097152, 2097152)
DISPATCH(runtime·call4194304, 4194304)
DISPATCH(runtime·call8388608, 8388608)
DISPATCH(runtime·call16777216, 16777216)
DISPATCH(runtime·call33554432, 33554432)
DISPATCH(runtime·call67108864, 67108864)
DISPATCH(runtime·call134217728, 134217728)
DISPATCH(runtime·call268435456, 268435456)
DISPATCH(runtime·call536870912, 536870912)
DISPATCH(runtime·call1073741824, 1073741824)
MOVL $runtime·badreflectcall(SB), AX
JMP AX
#define CALLFN(NAME,MAXSIZE) \
TEXT NAME(SB), WRAPPER, $MAXSIZE-20; \
NO_LOCAL_POINTERS; \
/* copy arguments to stack */ \
MOVL argptr+8(FP), SI; \
MOVL argsize+12(FP), CX; \
MOVL SP, DI; \
REP;MOVSB; \
/* call function */ \
MOVL f+4(FP), DX; \
MOVL (DX), AX; \
CALL AX; \
/* copy return values back */ \
MOVL argptr+8(FP), DI; \
MOVL argsize+12(FP), CX; \
MOVL retoffset+16(FP), BX; \
MOVL SP, SI; \
ADDL BX, DI; \
ADDL BX, SI; \
SUBL BX, CX; \
REP;MOVSB; \
/* execute write barrier updates */ \
MOVL argtype+0(FP), DX; \
MOVL argptr+8(FP), DI; \
MOVL argsize+12(FP), CX; \
MOVL retoffset+16(FP), BX; \
MOVL DX, 0(SP); \
MOVL DI, 4(SP); \
MOVL CX, 8(SP); \
MOVL BX, 12(SP); \
CALL runtime·callwritebarrier(SB); \
RET
CALLFN(·call16, 16)
CALLFN(·call32, 32)
CALLFN(·call64, 64)
CALLFN(·call128, 128)
CALLFN(·call256, 256)
CALLFN(·call512, 512)
CALLFN(·call1024, 1024)
CALLFN(·call2048, 2048)
CALLFN(·call4096, 4096)
CALLFN(·call8192, 8192)
CALLFN(·call16384, 16384)
CALLFN(·call32768, 32768)
CALLFN(·call65536, 65536)
CALLFN(·call131072, 131072)
CALLFN(·call262144, 262144)
CALLFN(·call524288, 524288)
CALLFN(·call1048576, 1048576)
CALLFN(·call2097152, 2097152)
CALLFN(·call4194304, 4194304)
CALLFN(·call8388608, 8388608)
CALLFN(·call16777216, 16777216)
CALLFN(·call33554432, 33554432)
CALLFN(·call67108864, 67108864)
CALLFN(·call134217728, 134217728)
CALLFN(·call268435456, 268435456)
CALLFN(·call536870912, 536870912)
CALLFN(·call1073741824, 1073741824)
// bool cas(int32 *val, int32 old, int32 new)
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
TEXT runtime·cas(SB), NOSPLIT, $0-17
MOVL ptr+0(FP), BX
MOVL old+4(FP), AX
MOVL new+8(FP), CX
LOCK
CMPXCHGL CX, 0(BX)
SETEQ ret+16(FP)
RET
TEXT runtime·casuintptr(SB), NOSPLIT, $0-17
JMP runtime·cas(SB)
TEXT runtime·atomicloaduintptr(SB), NOSPLIT, $0-12
JMP runtime·atomicload(SB)
TEXT runtime·atomicloaduint(SB), NOSPLIT, $0-12
JMP runtime·atomicload(SB)
TEXT runtime·atomicstoreuintptr(SB), NOSPLIT, $0-12
JMP runtime·atomicstore(SB)
// bool runtime·cas64(uint64 *val, uint64 old, uint64 new)
// Atomically:
// if(*val == *old){
// *val = new;
// return 1;
// } else {
// return 0;
// }
TEXT runtime·cas64(SB), NOSPLIT, $0-25
MOVL ptr+0(FP), BX
MOVQ old+8(FP), AX
MOVQ new+16(FP), CX
LOCK
CMPXCHGQ CX, 0(BX)
SETEQ ret+24(FP)
RET
// bool casp(void **val, void *old, void *new)
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
TEXT runtime·casp1(SB), NOSPLIT, $0-17
MOVL ptr+0(FP), BX
MOVL old+4(FP), AX
MOVL new+8(FP), CX
LOCK
CMPXCHGL CX, 0(BX)
SETEQ ret+16(FP)
RET
// uint32 xadd(uint32 volatile *val, int32 delta)
// Atomically:
// *val += delta;
// return *val;
TEXT runtime·xadd(SB), NOSPLIT, $0-12
MOVL ptr+0(FP), BX
MOVL delta+4(FP), AX
MOVL AX, CX
LOCK
XADDL AX, 0(BX)
ADDL CX, AX
MOVL AX, ret+8(FP)
RET
TEXT runtime·xadd64(SB), NOSPLIT, $0-24
MOVL ptr+0(FP), BX
MOVQ delta+8(FP), AX
MOVQ AX, CX
LOCK
XADDQ AX, 0(BX)
ADDQ CX, AX
MOVQ AX, ret+16(FP)
RET
TEXT runtime·xadduintptr(SB), NOSPLIT, $0-12
JMP runtime·xadd(SB)
TEXT runtime·xchg(SB), NOSPLIT, $0-12
MOVL ptr+0(FP), BX
MOVL new+4(FP), AX
XCHGL AX, 0(BX)
MOVL AX, ret+8(FP)
RET
TEXT runtime·xchg64(SB), NOSPLIT, $0-24
MOVL ptr+0(FP), BX
MOVQ new+8(FP), AX
XCHGQ AX, 0(BX)
MOVQ AX, ret+16(FP)
RET
TEXT runtime·xchguintptr(SB), NOSPLIT, $0-12
JMP runtime·xchg(SB)
TEXT runtime·procyield(SB),NOSPLIT,$0-0
MOVL cycles+0(FP), AX
again:
PAUSE
SUBL $1, AX
JNZ again
RET
TEXT runtime·atomicstorep1(SB), NOSPLIT, $0-8
MOVL ptr+0(FP), BX
MOVL val+4(FP), AX
XCHGL AX, 0(BX)
RET
TEXT runtime·atomicstore(SB), NOSPLIT, $0-8
MOVL ptr+0(FP), BX
MOVL val+4(FP), AX
XCHGL AX, 0(BX)
RET
TEXT runtime·atomicstore64(SB), NOSPLIT, $0-16
MOVL ptr+0(FP), BX
MOVQ val+8(FP), AX
XCHGQ AX, 0(BX)
RET
// void runtime·atomicor8(byte volatile*, byte);
TEXT runtime·atomicor8(SB), NOSPLIT, $0-5
MOVL ptr+0(FP), BX
MOVB val+4(FP), AX
LOCK
ORB AX, 0(BX)
RET
// void runtime·atomicand8(byte volatile*, byte);
TEXT runtime·atomicand8(SB), NOSPLIT, $0-5
MOVL ptr+0(FP), BX
MOVB val+4(FP), AX
LOCK
ANDB AX, 0(BX)
RET
TEXT ·publicationBarrier(SB),NOSPLIT,$0-0
// Stores are already ordered on x86, so this is just a
// compile barrier.
RET
// void jmpdefer(fn, sp);
// called from deferreturn.
// 1. pop the caller
// 2. sub 5 bytes from the callers return
// 3. jmp to the argument
TEXT runtime·jmpdefer(SB), NOSPLIT, $0-8
MOVL fv+0(FP), DX
MOVL argp+4(FP), BX
LEAL -8(BX), SP // caller sp after CALL
SUBL $5, (SP) // return to CALL again
MOVL 0(DX), BX
JMP BX // but first run the deferred function
// func asmcgocall(fn, arg unsafe.Pointer) int32
// Not implemented.
TEXT runtime·asmcgocall(SB),NOSPLIT,$0-12
MOVL 0, AX
RET
// cgocallback(void (*fn)(void*), void *frame, uintptr framesize)
// Not implemented.
TEXT runtime·cgocallback(SB),NOSPLIT,$0-12
MOVL 0, AX
RET
// cgocallback_gofunc(FuncVal*, void *frame, uintptr framesize)
// Not implemented.
TEXT ·cgocallback_gofunc(SB),NOSPLIT,$0-12
MOVL 0, AX
RET
// void setg(G*); set g. for use by needm.
// Not implemented.
TEXT runtime·setg(SB), NOSPLIT, $0-4
MOVL 0, AX
RET
// check that SP is in range [g->stack.lo, g->stack.hi)
TEXT runtime·stackcheck(SB), NOSPLIT, $0-0
get_tls(CX)
MOVL g(CX), AX
CMPL (g_stack+stack_hi)(AX), SP
JHI 2(PC)
MOVL 0, AX
CMPL SP, (g_stack+stack_lo)(AX)
JHI 2(PC)
MOVL 0, AX
RET
TEXT runtime·memclr(SB),NOSPLIT,$0-8
MOVL ptr+0(FP), DI
MOVL n+4(FP), CX
MOVQ CX, BX
ANDQ $7, BX
SHRQ $3, CX
MOVQ $0, AX
CLD
REP
STOSQ
MOVQ BX, CX
REP
STOSB
RET
TEXT runtime·getcallerpc(SB),NOSPLIT,$8-12
MOVL argp+0(FP),AX // addr of first arg
MOVL -8(AX),AX // get calling pc
CMPL AX, runtime·stackBarrierPC(SB)
JNE nobar
// Get original return PC.
CALL runtime·nextBarrierPC(SB)
MOVL 0(SP), AX
nobar:
MOVL AX, ret+8(FP)
RET
TEXT runtime·setcallerpc(SB),NOSPLIT,$8-8
MOVL argp+0(FP),AX // addr of first arg
MOVL pc+4(FP), BX // pc to set
MOVL -8(AX), CX
CMPL CX, runtime·stackBarrierPC(SB)
JEQ setbar
MOVQ BX, -8(AX) // set calling pc
RET
setbar:
// Set the stack barrier return PC.
MOVL BX, 0(SP)
CALL runtime·setNextBarrierPC(SB)
RET
TEXT runtime·getcallersp(SB),NOSPLIT,$0-12
MOVL argp+0(FP), AX
MOVL AX, ret+8(FP)
RET
// int64 runtime·cputicks(void)
TEXT runtime·cputicks(SB),NOSPLIT,$0-0
RDTSC
SHLQ $32, DX
ADDQ DX, AX
MOVQ AX, ret+0(FP)
RET
// memhash_varlen(p unsafe.Pointer, h seed) uintptr
// redirects to memhash(p, h, size) using the size
// stored in the closure.
TEXT runtime·memhash_varlen(SB),NOSPLIT,$24-12
GO_ARGS
NO_LOCAL_POINTERS
MOVL p+0(FP), AX
MOVL h+4(FP), BX
MOVL 4(DX), CX
MOVL AX, 0(SP)
MOVL BX, 4(SP)
MOVL CX, 8(SP)
CALL runtime·memhash(SB)
MOVL 16(SP), AX
MOVL AX, ret+8(FP)
RET
// hash function using AES hardware instructions
// For now, our one amd64p32 system (NaCl) does not
// support using AES instructions, so have not bothered to
// write the implementations. Can copy and adjust the ones
// in asm_amd64.s when the time comes.
TEXT runtime·aeshash(SB),NOSPLIT,$0-20
MOVL AX, ret+16(FP)
RET
TEXT runtime·aeshashstr(SB),NOSPLIT,$0-20
MOVL AX, ret+16(FP)
RET
TEXT runtime·aeshash32(SB),NOSPLIT,$0-20
MOVL AX, ret+16(FP)
RET
TEXT runtime·aeshash64(SB),NOSPLIT,$0-20
MOVL AX, ret+16(FP)
RET
TEXT runtime·memeq(SB),NOSPLIT,$0-17
MOVL a+0(FP), SI
MOVL b+4(FP), DI
MOVL size+8(FP), BX
CALL runtime·memeqbody(SB)
MOVB AX, ret+16(FP)
RET
// memequal_varlen(a, b unsafe.Pointer) bool
TEXT runtime·memequal_varlen(SB),NOSPLIT,$0-9
MOVL a+0(FP), SI
MOVL b+4(FP), DI
CMPL SI, DI
JEQ eq
MOVL 4(DX), BX // compiler stores size at offset 4 in the closure
CALL runtime·memeqbody(SB)
MOVB AX, ret+8(FP)
RET
eq:
MOVB $1, ret+8(FP)
RET
// eqstring tests whether two strings are equal.
// The compiler guarantees that strings passed
// to eqstring have equal length.
// See runtime_test.go:eqstring_generic for
// equivalent Go code.
TEXT runtime·eqstring(SB),NOSPLIT,$0-17
MOVL s1str+0(FP), SI
MOVL s2str+8(FP), DI
CMPL SI, DI
JEQ same
MOVL s1len+4(FP), BX
CALL runtime·memeqbody(SB)
MOVB AX, v+16(FP)
RET
same:
MOVB $1, v+16(FP)
RET
// a in SI
// b in DI
// count in BX
TEXT runtime·memeqbody(SB),NOSPLIT,$0-0
XORQ AX, AX
CMPQ BX, $8
JB small
// 64 bytes at a time using xmm registers
hugeloop:
CMPQ BX, $64
JB bigloop
MOVOU (SI), X0
MOVOU (DI), X1
MOVOU 16(SI), X2
MOVOU 16(DI), X3
MOVOU 32(SI), X4
MOVOU 32(DI), X5
MOVOU 48(SI), X6
MOVOU 48(DI), X7
PCMPEQB X1, X0
PCMPEQB X3, X2
PCMPEQB X5, X4
PCMPEQB X7, X6
PAND X2, X0
PAND X6, X4
PAND X4, X0
PMOVMSKB X0, DX
ADDQ $64, SI
ADDQ $64, DI
SUBQ $64, BX
CMPL DX, $0xffff
JEQ hugeloop
RET
// 8 bytes at a time using 64-bit register
bigloop:
CMPQ BX, $8
JBE leftover
MOVQ (SI), CX
MOVQ (DI), DX
ADDQ $8, SI
ADDQ $8, DI
SUBQ $8, BX
CMPQ CX, DX
JEQ bigloop
RET
// remaining 0-8 bytes
leftover:
ADDQ BX, SI
ADDQ BX, DI
MOVQ -8(SI), CX
MOVQ -8(DI), DX
CMPQ CX, DX
SETEQ AX
RET
small:
CMPQ BX, $0
JEQ equal
LEAQ 0(BX*8), CX
NEGQ CX
CMPB SI, $0xf8
JA si_high
// load at SI won't cross a page boundary.
MOVQ (SI), SI
JMP si_finish
si_high:
// address ends in 11111xxx. Load up to bytes we want, move to correct position.
MOVQ BX, DX
ADDQ SI, DX
MOVQ -8(DX), SI
SHRQ CX, SI
si_finish:
// same for DI.
CMPB DI, $0xf8
JA di_high
MOVQ (DI), DI
JMP di_finish
di_high:
MOVQ BX, DX
ADDQ DI, DX
MOVQ -8(DX), DI
SHRQ CX, DI
di_finish:
SUBQ SI, DI
SHLQ CX, DI
equal:
SETEQ AX
RET
TEXT runtime·cmpstring(SB),NOSPLIT,$0-20
MOVL s1_base+0(FP), SI
MOVL s1_len+4(FP), BX
MOVL s2_base+8(FP), DI
MOVL s2_len+12(FP), DX
CALL runtime·cmpbody(SB)
MOVL AX, ret+16(FP)
RET
TEXT bytes·Compare(SB),NOSPLIT,$0-28
MOVL s1+0(FP), SI
MOVL s1+4(FP), BX
MOVL s2+12(FP), DI
MOVL s2+16(FP), DX
CALL runtime·cmpbody(SB)
MOVL AX, res+24(FP)
RET
// input:
// SI = a
// DI = b
// BX = alen
// DX = blen
// output:
// AX = 1/0/-1
TEXT runtime·cmpbody(SB),NOSPLIT,$0-0
CMPQ SI, DI
JEQ allsame
CMPQ BX, DX
MOVQ DX, R8
CMOVQLT BX, R8 // R8 = min(alen, blen) = # of bytes to compare
CMPQ R8, $8
JB small
loop:
CMPQ R8, $16
JBE _0through16
MOVOU (SI), X0
MOVOU (DI), X1
PCMPEQB X0, X1
PMOVMSKB X1, AX
XORQ $0xffff, AX // convert EQ to NE
JNE diff16 // branch if at least one byte is not equal
ADDQ $16, SI
ADDQ $16, DI
SUBQ $16, R8
JMP loop
// AX = bit mask of differences
diff16:
BSFQ AX, BX // index of first byte that differs
XORQ AX, AX
ADDQ BX, SI
MOVB (SI), CX
ADDQ BX, DI
CMPB CX, (DI)
SETHI AX
LEAQ -1(AX*2), AX // convert 1/0 to +1/-1
RET
// 0 through 16 bytes left, alen>=8, blen>=8
_0through16:
CMPQ R8, $8
JBE _0through8
MOVQ (SI), AX
MOVQ (DI), CX
CMPQ AX, CX
JNE diff8
_0through8:
ADDQ R8, SI
ADDQ R8, DI
MOVQ -8(SI), AX
MOVQ -8(DI), CX
CMPQ AX, CX
JEQ allsame
// AX and CX contain parts of a and b that differ.
diff8:
BSWAPQ AX // reverse order of bytes
BSWAPQ CX
XORQ AX, CX
BSRQ CX, CX // index of highest bit difference
SHRQ CX, AX // move a's bit to bottom
ANDQ $1, AX // mask bit
LEAQ -1(AX*2), AX // 1/0 => +1/-1
RET
// 0-7 bytes in common
small:
LEAQ (R8*8), CX // bytes left -> bits left
NEGQ CX // - bits lift (== 64 - bits left mod 64)
JEQ allsame
// load bytes of a into high bytes of AX
CMPB SI, $0xf8
JA si_high
MOVQ (SI), SI
JMP si_finish
si_high:
ADDQ R8, SI
MOVQ -8(SI), SI
SHRQ CX, SI
si_finish:
SHLQ CX, SI
// load bytes of b in to high bytes of BX
CMPB DI, $0xf8
JA di_high
MOVQ (DI), DI
JMP di_finish
di_high:
ADDQ R8, DI
MOVQ -8(DI), DI
SHRQ CX, DI
di_finish:
SHLQ CX, DI
BSWAPQ SI // reverse order of bytes
BSWAPQ DI
XORQ SI, DI // find bit differences
JEQ allsame
BSRQ DI, CX // index of highest bit difference
SHRQ CX, SI // move a's bit to bottom
ANDQ $1, SI // mask bit
LEAQ -1(SI*2), AX // 1/0 => +1/-1
RET
allsame:
XORQ AX, AX
XORQ CX, CX
CMPQ BX, DX
SETGT AX // 1 if alen > blen
SETEQ CX // 1 if alen == blen
LEAQ -1(CX)(AX*2), AX // 1,0,-1 result
RET
TEXT bytes·IndexByte(SB),NOSPLIT,$0-20
MOVL s+0(FP), SI
MOVL s_len+4(FP), BX
MOVB c+12(FP), AL
CALL runtime·indexbytebody(SB)
MOVL AX, ret+16(FP)
RET
TEXT strings·IndexByte(SB),NOSPLIT,$0-20
MOVL s+0(FP), SI
MOVL s_len+4(FP), BX
MOVB c+8(FP), AL
CALL runtime·indexbytebody(SB)
MOVL AX, ret+16(FP)
RET