014c000f6a
This started by noticing that scalar and vector types were producing different results with div ops in PR36305: https://bugs.llvm.org/show_bug.cgi?id=36305 ...but the problem is bigger. I couldn't keep it straight without a table, so I'm attaching that as a PDF to the review. The x86 tests in undef-ops.ll correspond to that table. Green means that instsimplify and the DAG agree on the result for all types. Red means the DAG was returning undef when IR was not. Yellow means the DAG was returning a non-undef result when IR returned undef. This patch assumes that we're currently doing the right thing in IR. Note: I couldn't find any problems with lowering vector constants as the code comments were warning, but those comments were written long ago in rL36413 . Differential Revision: https://reviews.llvm.org/D43141 llvm-svn: 324941
41 lines
1.2 KiB
LLVM
41 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-darwin | FileCheck %s
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; CHECK-LABEL: LCPI0_0:
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; CHECK-NEXT: .long 4286578688
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; CHECK-LABEL: LCPI0_1:
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; CHECK-NEXT: .long 2139095040
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define x86_fp80 @foo(x86_fp80 %a) {
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; CHECK-LABEL: foo:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: fldt {{[0-9]+}}(%rsp)
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; CHECK-NEXT: fstpt -{{[0-9]+}}(%rsp)
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; CHECK-NEXT: testb $-128, -{{[0-9]+}}(%rsp)
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; CHECK-NEXT: flds {{.*}}(%rip)
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; CHECK-NEXT: flds {{.*}}(%rip)
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; CHECK-NEXT: fcmovne %st(1), %st(0)
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; CHECK-NEXT: fstp %st(1)
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; CHECK-NEXT: retq
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%1 = tail call x86_fp80 @copysignl(x86_fp80 0xK7FFF8000000000000000, x86_fp80 %a) nounwind readnone
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ret x86_fp80 %1
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}
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declare x86_fp80 @copysignl(x86_fp80, x86_fp80) nounwind readnone
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; This would crash:
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; https://llvm.org/bugs/show_bug.cgi?id=26070
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define float @pr26070() {
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; CHECK-LABEL: pr26070:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
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; CHECK-NEXT: shufps {{.*#+}} xmm0 = xmm0[0,0,0,0]
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; CHECK-NEXT: retq
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%c = call float @copysignf(float 1.0, float undef) readnone
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ret float %c
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}
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declare float @copysignf(float, float)
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