[DAG] Add baseline test coverage for #161036#168278
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Baseline tests from llvm#161651 that were reverted in llvm#167854 Still missing test coverage for the ffmpeg regression failures
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@llvm/pr-subscribers-backend-x86 @llvm/pr-subscribers-backend-aarch64 Author: Simon Pilgrim (RKSimon) ChangesBaseline tests from #161651 that were reverted in #167854 Still missing test coverage for the ffmpeg regression failures Full diff: https://github.com/llvm/llvm-project/pull/168278.diff 2 Files Affected:
diff --git a/llvm/test/CodeGen/AArch64/umin-sub-to-usubo-select-combine.ll b/llvm/test/CodeGen/AArch64/umin-sub-to-usubo-select-combine.ll
new file mode 100644
index 0000000000000..d5f516fb3aa27
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/umin-sub-to-usubo-select-combine.ll
@@ -0,0 +1,158 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc < %s -mtriple=aarch64 | FileCheck %s
+
+; GitHub issue #161036
+
+; Positive test : umin(sub(a,b),a) with scalar types should be folded
+define i64 @underflow_compare_fold_i64(i64 %a, i64 %b) {
+; CHECK-LABEL: underflow_compare_fold_i64:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub x8, x0, x1
+; CHECK-NEXT: cmp x8, x0
+; CHECK-NEXT: csel x0, x8, x0, lo
+; CHECK-NEXT: ret
+ %sub = sub i64 %a, %b
+ %cond = tail call i64 @llvm.umin.i64(i64 %sub, i64 %a)
+ ret i64 %cond
+}
+
+; Positive test : umin(a,sub(a,b)) with scalar types should be folded
+define i64 @underflow_compare_fold_i64_commute(i64 %a, i64 %b) {
+; CHECK-LABEL: underflow_compare_fold_i64_commute:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub x8, x0, x1
+; CHECK-NEXT: cmp x0, x8
+; CHECK-NEXT: csel x0, x0, x8, lo
+; CHECK-NEXT: ret
+ %sub = sub i64 %a, %b
+ %cond = tail call i64 @llvm.umin.i64(i64 %a, i64 %sub)
+ ret i64 %cond
+}
+
+; Positive test : multi-use is OK since the sub instruction still runs once
+define i64 @underflow_compare_fold_i64_multi_use(i64 %a, i64 %b, ptr addrspace(1) %ptr) {
+; CHECK-LABEL: underflow_compare_fold_i64_multi_use:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub x8, x0, x1
+; CHECK-NEXT: cmp x8, x0
+; CHECK-NEXT: str x8, [x2]
+; CHECK-NEXT: csel x0, x8, x0, lo
+; CHECK-NEXT: ret
+ %sub = sub i64 %a, %b
+ store i64 %sub, ptr addrspace(1) %ptr
+ %cond = call i64 @llvm.umin.i64(i64 %sub, i64 %a)
+ ret i64 %cond
+}
+
+; Positive test : i32
+define i32 @underflow_compare_fold_i32(i32 %a, i32 %b) {
+; CHECK-LABEL: underflow_compare_fold_i32:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub w8, w0, w1
+; CHECK-NEXT: cmp w8, w0
+; CHECK-NEXT: csel w0, w8, w0, lo
+; CHECK-NEXT: ret
+ %sub = sub i32 %a, %b
+ %cond = tail call i32 @llvm.umin.i32(i32 %sub, i32 %a)
+ ret i32 %cond
+}
+
+; Positive test : i32
+define i32 @underflow_compare_fold_i32_commute(i32 %a, i32 %b) {
+; CHECK-LABEL: underflow_compare_fold_i32_commute:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub w8, w0, w1
+; CHECK-NEXT: cmp w0, w8
+; CHECK-NEXT: csel w0, w0, w8, lo
+; CHECK-NEXT: ret
+ %sub = sub i32 %a, %b
+ %cond = tail call i32 @llvm.umin.i32(i32 %a, i32 %sub)
+ ret i32 %cond
+}
+
+; Positive test : i32
+define i32 @underflow_compare_fold_i32_multi_use(i32 %a, i32 %b, ptr addrspace(1) %ptr) {
+; CHECK-LABEL: underflow_compare_fold_i32_multi_use:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub w8, w0, w1
+; CHECK-NEXT: cmp w8, w0
+; CHECK-NEXT: str w8, [x2]
+; CHECK-NEXT: csel w0, w8, w0, lo
+; CHECK-NEXT: ret
+ %sub = sub i32 %a, %b
+ store i32 %sub, ptr addrspace(1) %ptr
+ %cond = call i32 @llvm.umin.i32(i32 %sub, i32 %a)
+ ret i32 %cond
+}
+
+; Negative test : i16
+define i16 @underflow_compare_fold_i16(i16 %a, i16 %b) {
+; CHECK-LABEL: underflow_compare_fold_i16:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub w8, w0, w1
+; CHECK-NEXT: and w9, w0, #0xffff
+; CHECK-NEXT: and w8, w8, #0xffff
+; CHECK-NEXT: cmp w8, w9
+; CHECK-NEXT: csel w0, w8, w9, lo
+; CHECK-NEXT: ret
+ %sub = sub i16 %a, %b
+ %cond = tail call i16 @llvm.umin.i16(i16 %sub, i16 %a)
+ ret i16 %cond
+}
+
+; Negative test : i16
+define i16 @underflow_compare_fold_i16_commute(i16 %a, i16 %b) {
+; CHECK-LABEL: underflow_compare_fold_i16_commute:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub w8, w0, w1
+; CHECK-NEXT: and w9, w0, #0xffff
+; CHECK-NEXT: and w8, w8, #0xffff
+; CHECK-NEXT: cmp w9, w8
+; CHECK-NEXT: csel w0, w9, w8, lo
+; CHECK-NEXT: ret
+ %sub = sub i16 %a, %b
+ %cond = tail call i16 @llvm.umin.i16(i16 %a, i16 %sub)
+ ret i16 %cond
+}
+
+; Negative test : i16
+define i16 @underflow_compare_fold_i16_multi_use(i16 %a, i16 %b, ptr addrspace(1) %ptr) {
+; CHECK-LABEL: underflow_compare_fold_i16_multi_use:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub w8, w0, w1
+; CHECK-NEXT: and w9, w0, #0xffff
+; CHECK-NEXT: and w10, w8, #0xffff
+; CHECK-NEXT: strh w8, [x2]
+; CHECK-NEXT: cmp w10, w9
+; CHECK-NEXT: csel w0, w10, w9, lo
+; CHECK-NEXT: ret
+ %sub = sub i16 %a, %b
+ store i16 %sub, ptr addrspace(1) %ptr
+ %cond = call i16 @llvm.umin.i16(i16 %sub, i16 %a)
+ ret i16 %cond
+}
+
+; Negative test, vector types : umin(sub(a,b),a) but with vectors
+define <16 x i8> @underflow_compare_dontfold_vectors(<16 x i8> %a, <16 x i8> %b) {
+; CHECK-LABEL: underflow_compare_dontfold_vectors:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sub v1.16b, v0.16b, v1.16b
+; CHECK-NEXT: umin v0.16b, v1.16b, v0.16b
+; CHECK-NEXT: ret
+ %sub = sub <16 x i8> %a, %b
+ %cond = tail call <16 x i8> @llvm.umin.v16i8(<16 x i8> %sub, <16 x i8> %a)
+ ret <16 x i8> %cond
+}
+
+; Negative test, pattern mismatch : umin(add(a,b),a)
+define i64 @umin_add(i64 %a, i64 %b) {
+; CHECK-LABEL: umin_add:
+; CHECK: // %bb.0:
+; CHECK-NEXT: add x8, x0, x1
+; CHECK-NEXT: cmp x8, x0
+; CHECK-NEXT: csel x0, x8, x0, lo
+; CHECK-NEXT: ret
+ %add = add i64 %a, %b
+ %cond = tail call i64 @llvm.umin.i64(i64 %add, i64 %a)
+ ret i64 %cond
+}
diff --git a/llvm/test/CodeGen/X86/umin-sub-to-usubo-select-combine.ll b/llvm/test/CodeGen/X86/umin-sub-to-usubo-select-combine.ll
new file mode 100644
index 0000000000000..6739be52d47f6
--- /dev/null
+++ b/llvm/test/CodeGen/X86/umin-sub-to-usubo-select-combine.ll
@@ -0,0 +1,166 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc < %s -mtriple=x86_64 | FileCheck %s
+
+; GitHub issue #161036
+
+; Positive test : umin(sub(a,b),a) with scalar types should be folded
+define i64 @underflow_compare_fold_i64(i64 %a, i64 %b) {
+; CHECK-LABEL: underflow_compare_fold_i64:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movq %rdi, %rax
+; CHECK-NEXT: subq %rsi, %rax
+; CHECK-NEXT: cmpq %rdi, %rax
+; CHECK-NEXT: cmovaeq %rdi, %rax
+; CHECK-NEXT: retq
+ %sub = sub i64 %a, %b
+ %cond = tail call i64 @llvm.umin.i64(i64 %sub, i64 %a)
+ ret i64 %cond
+}
+
+; Positive test : umin(a,sub(a,b)) with scalar types should be folded
+define i64 @underflow_compare_fold_i64_commute(i64 %a, i64 %b) {
+; CHECK-LABEL: underflow_compare_fold_i64_commute:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movq %rdi, %rax
+; CHECK-NEXT: subq %rsi, %rax
+; CHECK-NEXT: cmpq %rax, %rdi
+; CHECK-NEXT: cmovbq %rdi, %rax
+; CHECK-NEXT: retq
+ %sub = sub i64 %a, %b
+ %cond = tail call i64 @llvm.umin.i64(i64 %a, i64 %sub)
+ ret i64 %cond
+}
+
+; Positive test : multi-use is OK since the sub instruction still runs once
+define i64 @underflow_compare_fold_i64_multi_use(i64 %a, i64 %b, ptr addrspace(1) %ptr) {
+; CHECK-LABEL: underflow_compare_fold_i64_multi_use:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movq %rdi, %rax
+; CHECK-NEXT: subq %rsi, %rax
+; CHECK-NEXT: movq %rax, (%rdx)
+; CHECK-NEXT: cmpq %rdi, %rax
+; CHECK-NEXT: cmovaeq %rdi, %rax
+; CHECK-NEXT: retq
+ %sub = sub i64 %a, %b
+ store i64 %sub, ptr addrspace(1) %ptr
+ %cond = call i64 @llvm.umin.i64(i64 %sub, i64 %a)
+ ret i64 %cond
+}
+
+; Positive test : i32
+define i32 @underflow_compare_fold_i32(i32 %a, i32 %b) {
+; CHECK-LABEL: underflow_compare_fold_i32:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movl %edi, %eax
+; CHECK-NEXT: subl %esi, %eax
+; CHECK-NEXT: cmpl %edi, %eax
+; CHECK-NEXT: cmovael %edi, %eax
+; CHECK-NEXT: retq
+ %sub = sub i32 %a, %b
+ %cond = tail call i32 @llvm.umin.i32(i32 %sub, i32 %a)
+ ret i32 %cond
+}
+
+; Positive test : i32
+define i32 @underflow_compare_fold_i32_commute(i32 %a, i32 %b) {
+; CHECK-LABEL: underflow_compare_fold_i32_commute:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movl %edi, %eax
+; CHECK-NEXT: subl %esi, %eax
+; CHECK-NEXT: cmpl %eax, %edi
+; CHECK-NEXT: cmovbl %edi, %eax
+; CHECK-NEXT: retq
+ %sub = sub i32 %a, %b
+ %cond = tail call i32 @llvm.umin.i32(i32 %a, i32 %sub)
+ ret i32 %cond
+}
+
+; Positive test : i32
+define i32 @underflow_compare_fold_i32_multi_use(i32 %a, i32 %b, ptr addrspace(1) %ptr) {
+; CHECK-LABEL: underflow_compare_fold_i32_multi_use:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movl %edi, %eax
+; CHECK-NEXT: subl %esi, %eax
+; CHECK-NEXT: movl %eax, (%rdx)
+; CHECK-NEXT: cmpl %edi, %eax
+; CHECK-NEXT: cmovael %edi, %eax
+; CHECK-NEXT: retq
+ %sub = sub i32 %a, %b
+ store i32 %sub, ptr addrspace(1) %ptr
+ %cond = call i32 @llvm.umin.i32(i32 %sub, i32 %a)
+ ret i32 %cond
+}
+
+; Positive test : i16
+define i16 @underflow_compare_fold_i16(i16 %a, i16 %b) {
+; CHECK-LABEL: underflow_compare_fold_i16:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movl %edi, %eax
+; CHECK-NEXT: subl %esi, %eax
+; CHECK-NEXT: cmpw %di, %ax
+; CHECK-NEXT: cmovael %edi, %eax
+; CHECK-NEXT: # kill: def $ax killed $ax killed $eax
+; CHECK-NEXT: retq
+ %sub = sub i16 %a, %b
+ %cond = tail call i16 @llvm.umin.i16(i16 %sub, i16 %a)
+ ret i16 %cond
+}
+
+; Positive test : i16
+define i16 @underflow_compare_fold_i16_commute(i16 %a, i16 %b) {
+; CHECK-LABEL: underflow_compare_fold_i16_commute:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movl %edi, %eax
+; CHECK-NEXT: subl %esi, %eax
+; CHECK-NEXT: cmpw %ax, %di
+; CHECK-NEXT: cmovbl %edi, %eax
+; CHECK-NEXT: # kill: def $ax killed $ax killed $eax
+; CHECK-NEXT: retq
+ %sub = sub i16 %a, %b
+ %cond = tail call i16 @llvm.umin.i16(i16 %a, i16 %sub)
+ ret i16 %cond
+}
+
+; Positive test : i16
+define i16 @underflow_compare_fold_i16_multi_use(i16 %a, i16 %b, ptr addrspace(1) %ptr) {
+; CHECK-LABEL: underflow_compare_fold_i16_multi_use:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movl %edi, %eax
+; CHECK-NEXT: subl %esi, %eax
+; CHECK-NEXT: movw %ax, (%rdx)
+; CHECK-NEXT: cmpw %di, %ax
+; CHECK-NEXT: cmovael %edi, %eax
+; CHECK-NEXT: # kill: def $ax killed $ax killed $eax
+; CHECK-NEXT: retq
+ %sub = sub i16 %a, %b
+ store i16 %sub, ptr addrspace(1) %ptr
+ %cond = call i16 @llvm.umin.i16(i16 %sub, i16 %a)
+ ret i16 %cond
+}
+
+
+; Negative test, vector types : umin(sub(a,b),a) but with vectors
+define <16 x i8> @underflow_compare_dontfold_vectors(<16 x i8> %a, <16 x i8> %b) {
+; CHECK-LABEL: underflow_compare_dontfold_vectors:
+; CHECK: # %bb.0:
+; CHECK-NEXT: movdqa %xmm0, %xmm2
+; CHECK-NEXT: psubb %xmm1, %xmm2
+; CHECK-NEXT: pminub %xmm2, %xmm0
+; CHECK-NEXT: retq
+ %sub = sub <16 x i8> %a, %b
+ %cond = tail call <16 x i8> @llvm.umin.v16i8(<16 x i8> %sub, <16 x i8> %a)
+ ret <16 x i8> %cond
+}
+
+; Negative test, pattern mismatch : umin(add(a,b),a)
+define i64 @umin_add(i64 %a, i64 %b) {
+; CHECK-LABEL: umin_add:
+; CHECK: # %bb.0:
+; CHECK-NEXT: leaq (%rsi,%rdi), %rax
+; CHECK-NEXT: cmpq %rdi, %rax
+; CHECK-NEXT: cmovaeq %rdi, %rax
+; CHECK-NEXT: retq
+ %add = add i64 %a, %b
+ %cond = tail call i64 @llvm.umin.i64(i64 %add, i64 %a)
+ ret i64 %cond
+}
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/59/builds/27395 Here is the relevant piece of the build log for the reference |
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Nov 26, 2025
Baseline tests from llvm#161651 that were reverted in llvm#167854 Still missing test coverage for the ffmpeg regression failures
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Baseline tests from #161651 that were reverted in #167854
Still missing test coverage for the ffmpeg regression failures