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[InstSimplify] Missed optimization in math expression: squashing exp(log), log(exp)
Summary: This patch enables folding following expressions under -ffast-math flag: exp(log(x)) -> x, exp2(log2(x)) -> x, log(exp(x)) -> x, log2(exp2(x)) -> x Reviewers: spatel, hfinkel, davide Reviewed By: spatel, hfinkel, davide Subscribers: scanon, llvm-commits Differential Revision: https://reviews.llvm.org/D41381 llvm-svn: 321710
This commit is contained in:
Dmitry Venikov
parent
2d5456f029
commit
5d983d0524
@ -4493,28 +4493,55 @@ static Value *SimplifyIntrinsic(Function *F, IterTy ArgBegin, IterTy ArgEnd,
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}
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}
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Value *IIOperand = *ArgBegin;
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Value *X;
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switch (IID) {
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case Intrinsic::fabs: {
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if (SignBitMustBeZero(*ArgBegin, Q.TLI))
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return *ArgBegin;
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if (SignBitMustBeZero(IIOperand, Q.TLI))
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return IIOperand;
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return nullptr;
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}
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case Intrinsic::bswap: {
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Value *IIOperand = *ArgBegin;
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Value *X = nullptr;
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// bswap(bswap(x)) -> x
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if (match(IIOperand, m_BSwap(m_Value(X))))
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return X;
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return nullptr;
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}
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case Intrinsic::bitreverse: {
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Value *IIOperand = *ArgBegin;
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Value *X = nullptr;
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// bitreverse(bitreverse(x)) -> x
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if (match(IIOperand, m_BitReverse(m_Value(X))))
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return X;
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return nullptr;
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}
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case Intrinsic::exp: {
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// exp(log(x)) -> x
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if (Q.CxtI->isFast() &&
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match(IIOperand, m_Intrinsic<Intrinsic::log>(m_Value(X))))
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return X;
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return nullptr;
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}
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case Intrinsic::exp2: {
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// exp2(log2(x)) -> x
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if (Q.CxtI->isFast() &&
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match(IIOperand, m_Intrinsic<Intrinsic::log2>(m_Value(X))))
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return X;
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return nullptr;
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}
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case Intrinsic::log: {
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// log(exp(x)) -> x
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if (Q.CxtI->isFast() &&
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match(IIOperand, m_Intrinsic<Intrinsic::exp>(m_Value(X))))
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return X;
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return nullptr;
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}
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case Intrinsic::log2: {
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// log2(exp2(x)) -> x
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if (Q.CxtI->isFast() &&
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match(IIOperand, m_Intrinsic<Intrinsic::exp2>(m_Value(X)))) {
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return X;
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}
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return nullptr;
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}
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default:
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return nullptr;
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}
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71
test/Transforms/InstSimplify/exp-intrinsic.ll
Normal file
71
test/Transforms/InstSimplify/exp-intrinsic.ll
Normal file
@ -0,0 +1,71 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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declare double @llvm.exp.f64(double)
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declare double @llvm.log.f64(double)
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define double @exp_log(double %a) {
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; CHECK-LABEL: @exp_log(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.log.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.exp.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call double @llvm.log.f64(double %a)
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%2 = call double @llvm.exp.f64(double %1)
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ret double %2
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}
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define double @exp_log_fast(double %a) {
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; CHECK-LABEL: @exp_log_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.log.f64(double %a)
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%2 = call fast double @llvm.exp.f64(double %1)
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ret double %2
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}
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define double @exp_fast_log_strict(double %a) {
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; CHECK-LABEL: @exp_fast_log_strict(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call double @llvm.log.f64(double %a)
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%2 = call fast double @llvm.exp.f64(double %1)
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ret double %2
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}
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define double @exp_strict_log_fast(double %a) {
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; CHECK-LABEL: @exp_strict_log_fast(
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; CHECK-NEXT: [[TMP1:%.*]] = call fast double @llvm.log.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.exp.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call fast double @llvm.log.f64(double %a)
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%2 = call double @llvm.exp.f64(double %1)
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ret double %2
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}
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define double @exp_log_exp_log(double %a) {
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; CHECK-LABEL: @exp_log_exp_log(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.log.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.exp.f64(double [[TMP1]])
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; CHECK-NEXT: [[TMP3:%.*]] = call double @llvm.log.f64(double [[TMP2]])
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; CHECK-NEXT: [[TMP4:%.*]] = call double @llvm.exp.f64(double [[TMP3]])
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; CHECK-NEXT: ret double [[TMP4]]
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;
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%1 = call double @llvm.log.f64(double %a)
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%2 = call double @llvm.exp.f64(double %1)
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%3 = call double @llvm.log.f64(double %2)
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%4 = call double @llvm.exp.f64(double %3)
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ret double %4
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}
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define double @exp_log_exp_log_fast(double %a) {
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; CHECK-LABEL: @exp_log_exp_log_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.log.f64(double %a)
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%2 = call fast double @llvm.exp.f64(double %1)
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%3 = call fast double @llvm.log.f64(double %2)
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%4 = call fast double @llvm.exp.f64(double %3)
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ret double %4
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}
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71
test/Transforms/InstSimplify/exp2-intrinsic.ll
Normal file
71
test/Transforms/InstSimplify/exp2-intrinsic.ll
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@ -0,0 +1,71 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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declare double @llvm.exp2.f64(double)
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declare double @llvm.log2.f64(double)
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define double @exp2_log2(double %a) {
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; CHECK-LABEL: @exp2_log2(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.log2.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.exp2.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call double @llvm.log2.f64(double %a)
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%2 = call double @llvm.exp2.f64(double %1)
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ret double %2
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}
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define double @exp2_log2_fast(double %a) {
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; CHECK-LABEL: @exp2_log2_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.log2.f64(double %a)
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%2 = call fast double @llvm.exp2.f64(double %1)
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ret double %2
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}
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define double @exp2_fast_log2_strict(double %a) {
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; CHECK-LABEL: @exp2_fast_log2_strict(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call double @llvm.log2.f64(double %a)
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%2 = call fast double @llvm.exp2.f64(double %1)
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ret double %2
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}
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define double @exp2_strict_log2_fast(double %a) {
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; CHECK-LABEL: @exp2_strict_log2_fast(
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; CHECK-NEXT: [[TMP1:%.*]] = call fast double @llvm.log2.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.exp2.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call fast double @llvm.log2.f64(double %a)
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%2 = call double @llvm.exp2.f64(double %1)
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ret double %2
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}
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define double @exp2_log2_exp2_log2(double %a) {
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; CHECK-LABEL: @exp2_log2_exp2_log2(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.log2.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.exp2.f64(double [[TMP1]])
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; CHECK-NEXT: [[TMP3:%.*]] = call double @llvm.log2.f64(double [[TMP2]])
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; CHECK-NEXT: [[TMP4:%.*]] = call double @llvm.exp2.f64(double [[TMP3]])
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; CHECK-NEXT: ret double [[TMP4]]
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;
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%1 = call double @llvm.log2.f64(double %a)
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%2 = call double @llvm.exp2.f64(double %1)
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%3 = call double @llvm.log2.f64(double %2)
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%4 = call double @llvm.exp2.f64(double %3)
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ret double %4
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}
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define double @exp2_log2_exp2_log2_fast(double %a) {
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; CHECK-LABEL: @exp2_log2_exp2_log2_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.log2.f64(double %a)
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%2 = call fast double @llvm.exp2.f64(double %1)
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%3 = call fast double @llvm.log2.f64(double %2)
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%4 = call fast double @llvm.exp2.f64(double %3)
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ret double %4
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}
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71
test/Transforms/InstSimplify/log-intrinsic.ll
Normal file
71
test/Transforms/InstSimplify/log-intrinsic.ll
Normal file
@ -0,0 +1,71 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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declare double @llvm.log.f64(double)
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declare double @llvm.exp.f64(double)
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define double @log_exp(double %a) {
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; CHECK-LABEL: @log_exp(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.exp.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call double @llvm.exp.f64(double %a)
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%2 = call double @llvm.log.f64(double %1)
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ret double %2
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}
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define double @log_exp_fast(double %a) {
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; CHECK-LABEL: @log_exp_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.exp.f64(double %a)
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%2 = call fast double @llvm.log.f64(double %1)
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ret double %2
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}
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define double @log_fast_exp_strict(double %a) {
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; CHECK-LABEL: @log_fast_exp_strict(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call double @llvm.exp.f64(double %a)
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%2 = call fast double @llvm.log.f64(double %1)
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ret double %2
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}
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define double @log_strict_exp_fast(double %a) {
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; CHECK-LABEL: @log_strict_exp_fast(
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; CHECK-NEXT: [[TMP1:%.*]] = call fast double @llvm.exp.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call fast double @llvm.exp.f64(double %a)
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%2 = call double @llvm.log.f64(double %1)
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ret double %2
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}
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define double @log_exp_log_exp(double %a) {
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; CHECK-LABEL: @log_exp_log_exp(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.exp.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log.f64(double [[TMP1]])
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; CHECK-NEXT: [[TMP3:%.*]] = call double @llvm.exp.f64(double [[TMP2]])
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; CHECK-NEXT: [[TMP4:%.*]] = call double @llvm.log.f64(double [[TMP3]])
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; CHECK-NEXT: ret double [[TMP4]]
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;
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%1 = call double @llvm.exp.f64(double %a)
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%2 = call double @llvm.log.f64(double %1)
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%3 = call double @llvm.exp.f64(double %2)
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%4 = call double @llvm.log.f64(double %3)
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ret double %4
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}
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define double @log_exp_log_exp_fast(double %a) {
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; CHECK-LABEL: @log_exp_log_exp_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.exp.f64(double %a)
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%2 = call fast double @llvm.log.f64(double %1)
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%3 = call fast double @llvm.exp.f64(double %2)
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%4 = call fast double @llvm.log.f64(double %3)
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ret double %4
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}
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71
test/Transforms/InstSimplify/log2-intrinsic.ll
Normal file
71
test/Transforms/InstSimplify/log2-intrinsic.ll
Normal file
@ -0,0 +1,71 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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declare double @llvm.log2.f64(double)
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declare double @llvm.exp2.f64(double)
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define double @log2_exp2(double %a) {
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; CHECK-LABEL: @log2_exp2(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.exp2.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log2.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call double @llvm.exp2.f64(double %a)
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%2 = call double @llvm.log2.f64(double %1)
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ret double %2
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}
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define double @log2_exp2_fast(double %a) {
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; CHECK-LABEL: @log2_exp2_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.exp2.f64(double %a)
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%2 = call fast double @llvm.log2.f64(double %1)
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ret double %2
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}
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define double @log2_fast_exp2_strict(double %a) {
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; CHECK-LABEL: @log2_fast_exp2_strict(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call double @llvm.exp2.f64(double %a)
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%2 = call fast double @llvm.log2.f64(double %1)
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ret double %2
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}
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define double @log2_strict_exp2_fast(double %a) {
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; CHECK-LABEL: @log2_strict_exp2_fast(
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; CHECK-NEXT: [[TMP1:%.*]] = call fast double @llvm.exp2.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log2.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call fast double @llvm.exp2.f64(double %a)
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%2 = call double @llvm.log2.f64(double %1)
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ret double %2
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}
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define double @log2_exp2_log2_exp2(double %a) {
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; CHECK-LABEL: @log2_exp2_log2_exp2(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.exp2.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log2.f64(double [[TMP1]])
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; CHECK-NEXT: [[TMP3:%.*]] = call double @llvm.exp2.f64(double [[TMP2]])
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; CHECK-NEXT: [[TMP4:%.*]] = call double @llvm.log2.f64(double [[TMP3]])
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; CHECK-NEXT: ret double [[TMP4]]
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;
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%1 = call double @llvm.exp2.f64(double %a)
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%2 = call double @llvm.log2.f64(double %1)
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%3 = call double @llvm.exp2.f64(double %2)
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%4 = call double @llvm.log2.f64(double %3)
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ret double %4
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}
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define double @log2_exp2_log2_exp2_fast(double %a) {
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; CHECK-LABEL: @log2_exp2_log2_exp2_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.exp2.f64(double %a)
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%2 = call fast double @llvm.log2.f64(double %1)
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%3 = call fast double @llvm.exp2.f64(double %2)
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%4 = call fast double @llvm.log2.f64(double %3)
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ret double %4
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}
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