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[SimplifyLibCalls] Propagate fast math flags while optimizing pow(). 

llvm-svn: 291577
This commit is contained in:
Davide Italiano 2017-01-10 18:02:05 +00:00
parent 44bfe03da9
commit f8711f093e
2 changed files with 32 additions and 29 deletions
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5
llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
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@ -1139,6 +1139,10 @@ Value *LibCallSimplifier::optimizePow(CallInst *CI, IRBuilder<> &B) {
!V.isInteger())
return nullptr;
// Propagate fast math flags.
IRBuilder<>::FastMathFlagGuard Guard(B);
B.setFastMathFlags(CI->getFastMathFlags());
// We will memoize intermediate products of the Addition Chain.
Value *InnerChain[33] = {nullptr};
InnerChain[1] = Op1;
@ -1149,7 +1153,6 @@ Value *LibCallSimplifier::optimizePow(CallInst *CI, IRBuilder<> &B) {
bool ignored;
V.convert(APFloat::IEEEdouble(), APFloat::rmTowardZero, &ignored);
// TODO: Should the new instructions propagate the 'fast' flag of the pow()?
Value *FMul = getPow(InnerChain, V.convertToDouble(), B);
// For negative exponents simply compute the reciprocal.
if (Op2C->isNegative())

56
llvm/test/Transforms/InstCombine/pow-4.ll
View File

@ -10,8 +10,8 @@ declare float @llvm.pow.f32(float, float)
define float @test_simplify_4f(float %x) {
; CHECK-LABEL: @test_simplify_4f(
; CHECK-NOT: pow
; CHECK-NEXT: %1 = fmul float %x, %x
; CHECK-NEXT: %2 = fmul float %1, %1
; CHECK-NEXT: %1 = fmul fast float %x, %x
; CHECK-NEXT: %2 = fmul fast float %1, %1
; CHECK-NEXT: ret float %2
%1 = call fast float @llvm.pow.f32(float %x, float 4.000000e+00)
ret float %1
@ -21,8 +21,8 @@ define float @test_simplify_4f(float %x) {
define double @test_simplify_3(double %x) {
; CHECK-LABEL: @test_simplify_3(
; CHECK-NOT: pow
; CHECK-NEXT: %1 = fmul double %x, %x
; CHECK-NEXT: %2 = fmul double %1, %x
; CHECK-NEXT: %1 = fmul fast double %x, %x
; CHECK-NEXT: %2 = fmul fast double %1, %x
; CHECK-NEXT: ret double %2
%1 = call fast double @llvm.pow.f64(double %x, double 3.000000e+00)
ret double %1
@ -32,8 +32,8 @@ define double @test_simplify_3(double %x) {
define double @test_simplify_4(double %x) {
; CHECK-LABEL: @test_simplify_4(
; CHECK-NOT: pow
; CHECK-NEXT: %1 = fmul double %x, %x
; CHECK-NEXT: %2 = fmul double %1, %1
; CHECK-NEXT: %1 = fmul fast double %x, %x
; CHECK-NEXT: %2 = fmul fast double %1, %1
; CHECK-NEXT: ret double %2
%1 = call fast double @llvm.pow.f64(double %x, double 4.000000e+00)
ret double %1
@ -43,11 +43,11 @@ define double @test_simplify_4(double %x) {
define double @test_simplify_15(double %x) {
; CHECK-LABEL: @test_simplify_15(
; CHECK-NOT: pow
; CHECK-NEXT: %1 = fmul double %x, %x
; CHECK-NEXT: %2 = fmul double %1, %x
; CHECK-NEXT: %3 = fmul double %2, %2
; CHECK-NEXT: %4 = fmul double %3, %3
; CHECK-NEXT: %5 = fmul double %2, %4
; CHECK-NEXT: %1 = fmul fast double %x, %x
; CHECK-NEXT: %2 = fmul fast double %1, %x
; CHECK-NEXT: %3 = fmul fast double %2, %2
; CHECK-NEXT: %4 = fmul fast double %3, %3
; CHECK-NEXT: %5 = fmul fast double %2, %4
; CHECK-NEXT: ret double %5
%1 = call fast double @llvm.pow.f64(double %x, double 1.500000e+01)
ret double %1
@ -57,11 +57,11 @@ define double @test_simplify_15(double %x) {
define double @test_simplify_neg_7(double %x) {
; CHECK-LABEL: @test_simplify_neg_7(
; CHECK-NOT: pow
; CHECK-NEXT: %1 = fmul double %x, %x
; CHECK-NEXT: %2 = fmul double %1, %x
; CHECK-NEXT: %3 = fmul double %1, %2
; CHECK-NEXT: %4 = fmul double %1, %3
; CHECK-NEXT: %5 = fdiv double 1.000000e+00, %4
; CHECK-NEXT: %1 = fmul fast double %x, %x
; CHECK-NEXT: %2 = fmul fast double %1, %1
; CHECK-NEXT: %3 = fmul fast double %2, %x
; CHECK-NEXT: %4 = fmul fast double %1, %3
; CHECK-NEXT: %5 = fdiv fast double 1.000000e+00, %4
; CHECK-NEXT: ret double %5
%1 = call fast double @llvm.pow.f64(double %x, double -7.000000e+00)
ret double %1
@ -71,13 +71,13 @@ define double @test_simplify_neg_7(double %x) {
define double @test_simplify_neg_19(double %x) {
; CHECK-LABEL: @test_simplify_neg_19(
; CHECK-NOT: pow
; CHECK-NEXT: %1 = fmul double %x, %x
; CHECK-NEXT: %2 = fmul double %1, %1
; CHECK-NEXT: %3 = fmul double %2, %2
; CHECK-NEXT: %4 = fmul double %3, %3
; CHECK-NEXT: %5 = fmul double %1, %4
; CHECK-NEXT: %6 = fmul double %5, %x
; CHECK-NEXT: %7 = fdiv double 1.000000e+00, %6
; CHECK-NEXT: %1 = fmul fast double %x, %x
; CHECK-NEXT: %2 = fmul fast double %1, %1
; CHECK-NEXT: %3 = fmul fast double %2, %2
; CHECK-NEXT: %4 = fmul fast double %3, %3
; CHECK-NEXT: %5 = fmul fast double %1, %4
; CHECK-NEXT: %6 = fmul fast double %5, %x
; CHECK-NEXT: %7 = fdiv fast double 1.000000e+00, %6
; CHECK-NEXT: ret double %7
%1 = call fast double @llvm.pow.f64(double %x, double -1.900000e+01)
ret double %1
@ -97,11 +97,11 @@ define double @test_simplify_11_23(double %x) {
define double @test_simplify_32(double %x) {
; CHECK-LABEL: @test_simplify_32(
; CHECK-NOT: pow
; CHECK-NEXT: %1 = fmul double %x, %x
; CHECK-NEXT: %2 = fmul double %1, %1
; CHECK-NEXT: %3 = fmul double %2, %2
; CHECK-NEXT: %4 = fmul double %3, %3
; CHECK-NEXT: %5 = fmul double %4, %4
; CHECK-NEXT: %1 = fmul fast double %x, %x
; CHECK-NEXT: %2 = fmul fast double %1, %1
; CHECK-NEXT: %3 = fmul fast double %2, %2
; CHECK-NEXT: %4 = fmul fast double %3, %3
; CHECK-NEXT: %5 = fmul fast double %4, %4
; CHECK-NEXT: ret double %5
%1 = call fast double @llvm.pow.f64(double %x, double 3.200000e+01)
ret double %1