forked from OSchip/llvm-project
84 lines
2.8 KiB
LLVM
84 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-- -mattr=+sse4.1 | FileCheck %s
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; Test that when we don't -enable-unsafe-fp-math, we don't do the optimization
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; -0 - (A - B) to (B - A) because A==B, -0 != 0
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define float @negfp(float %a, float %b) nounwind {
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; CHECK-LABEL: negfp:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushl %eax
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; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
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; CHECK-NEXT: subss {{[0-9]+}}(%esp), %xmm0
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; CHECK-NEXT: xorps {{\.LCPI.*}}, %xmm0
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; CHECK-NEXT: movss %xmm0, (%esp)
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; CHECK-NEXT: flds (%esp)
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; CHECK-NEXT: popl %eax
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; CHECK-NEXT: retl
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entry:
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%sub = fsub float %a, %b ; <float> [#uses=1]
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%neg = fsub float -0.000000e+00, %sub ; <float> [#uses=1]
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ret float %neg
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}
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; This may infinite loop if isNegatibleForFree and getNegatedExpression are conflicted.
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define double @negation_propagation(double* %arg, double %arg1, double %arg2) nounwind {
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; CHECK-LABEL: negation_propagation:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushl %ebp
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; CHECK-NEXT: movl %esp, %ebp
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; CHECK-NEXT: andl $-8, %esp
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; CHECK-NEXT: subl $8, %esp
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; CHECK-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero
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; CHECK-NEXT: divsd 12(%ebp), %xmm0
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; CHECK-NEXT: movsd {{.*#+}} xmm1 = mem[0],zero
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; CHECK-NEXT: mulsd %xmm0, %xmm1
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; CHECK-NEXT: movapd %xmm0, %xmm2
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; CHECK-NEXT: mulsd %xmm0, %xmm2
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; CHECK-NEXT: mulsd %xmm0, %xmm2
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; CHECK-NEXT: subsd %xmm2, %xmm1
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; CHECK-NEXT: movsd %xmm1, (%esp)
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; CHECK-NEXT: fldl (%esp)
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; CHECK-NEXT: movl %ebp, %esp
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; CHECK-NEXT: popl %ebp
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; CHECK-NEXT: retl
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%t = fdiv double 1.0, %arg1
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%t7 = fmul double %t, %arg2
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%t10 = fneg double %t7
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%t11 = fmul double %t, %t
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%t13 = fsub double %t11, %t
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%t14 = fneg double %t
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%t15 = fmul double %t, %t14
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%t16 = fmul double %t, %t15
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%t18 = fadd double %t16, %t7
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ret double %t18
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}
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; This would crash because the negated expression for %sub4
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; creates a new use of %sub1 and that alters the negated cost
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define float @fdiv_extra_use_changes_cost(float %a0, float %a1, float %a2) nounwind {
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; CHECK-LABEL: fdiv_extra_use_changes_cost:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushl %eax
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; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
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; CHECK-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
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; CHECK-NEXT: subss {{[0-9]+}}(%esp), %xmm1
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; CHECK-NEXT: movaps %xmm1, %xmm2
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; CHECK-NEXT: mulss %xmm0, %xmm2
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; CHECK-NEXT: subss %xmm1, %xmm0
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; CHECK-NEXT: divss %xmm2, %xmm0
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; CHECK-NEXT: movss %xmm0, (%esp)
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; CHECK-NEXT: flds (%esp)
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; CHECK-NEXT: popl %eax
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; CHECK-NEXT: retl
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%sub1 = fsub fast float %a0, %a1
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%mul2 = fmul fast float %sub1, %a2
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%neg = fneg fast float %a0
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%add3 = fadd fast float %a1, %neg
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%sub4 = fadd fast float %add3, %a2
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%div5 = fdiv fast float %sub4, %mul2
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ret float %div5
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}
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