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23cfeced38
Generalize the simplification of `pow(2.0, y)` to `pow(2.0 ** n, y)` for all scalar and vector types. This improvement helps some benchmarks in SPEC CPU2000 and CPU2006, such as 252.eon, 447.dealII, 453.povray. Otherwise, no significant regressions on x86-64 or A64. Differential revision: https://reviews.llvm.org/D49273 llvm-svn: 341095
403 lines
14 KiB
LLVM
403 lines
14 KiB
LLVM
; Test that the pow library call simplifier works correctly.
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;
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; RUN: opt -instcombine -S < %s | FileCheck %s --check-prefixes=ANY
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; RUN: opt -instcombine -S < %s -mtriple=x86_64-apple-macosx10.9 | FileCheck %s --check-prefixes=ANY,CHECK-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=arm-apple-ios7.0 | FileCheck %s --check-prefixes=ANY,CHECK-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=x86_64-apple-macosx10.8 | FileCheck %s --check-prefixes=ANY,CHECK-NO-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=arm-apple-ios6.0 | FileCheck %s --check-prefixes=ANY,CHECK-NO-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=x86_64-netbsd | FileCheck %s --check-prefixes=ANY,CHECK-NO-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=arm-apple-tvos9.0 | FileCheck %s --check-prefixes=ANY,CHECK-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=arm-apple-watchos2.0 | FileCheck %s --check-prefixes=ANY,CHECK-EXP10
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; rdar://7251832
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; RUN: opt -instcombine -S < %s -mtriple=x86_64-pc-windows-msvc | FileCheck %s --check-prefixes=CHECK-WIN
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; NOTE: The readonly attribute on the pow call should be preserved
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; in the cases below where pow is transformed into another function call.
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declare float @powf(float, float) nounwind readonly
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declare double @pow(double, double) nounwind readonly
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declare double @llvm.pow.f64(double, double)
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declare <2 x float> @llvm.pow.v2f32(<2 x float>, <2 x float>) nounwind readonly
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declare <2 x double> @llvm.pow.v2f64(<2 x double>, <2 x double>) nounwind readonly
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; Check pow(1.0, x) -> 1.0.
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define float @test_simplify1(float %x) {
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; ANY-LABEL: @test_simplify1(
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; ANY-NEXT: ret float 1.000000e+00
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;
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%retval = call float @powf(float 1.0, float %x)
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ret float %retval
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}
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define <2 x float> @test_simplify1v(<2 x float> %x) {
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; ANY-LABEL: @test_simplify1v(
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; ANY-NEXT: ret <2 x float> <float 1.000000e+00, float 1.000000e+00>
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;
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%retval = call <2 x float> @llvm.pow.v2f32(<2 x float> <float 1.0, float 1.0>, <2 x float> %x)
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ret <2 x float> %retval
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}
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define double @test_simplify2(double %x) {
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; ANY-LABEL: @test_simplify2(
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; ANY-NEXT: ret double 1.000000e+00
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;
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%retval = call double @pow(double 1.0, double %x)
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ret double %retval
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}
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define <2 x double> @test_simplify2v(<2 x double> %x) {
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; ANY-LABEL: @test_simplify2v(
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; ANY-NEXT: ret <2 x double> <double 1.000000e+00, double 1.000000e+00>
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;
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%retval = call <2 x double> @llvm.pow.v2f64(<2 x double> <double 1.0, double 1.0>, <2 x double> %x)
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ret <2 x double> %retval
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}
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; Check pow(2.0 ** n, x) -> exp2(n * x).
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define float @test_simplify3(float %x) {
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; ANY-LABEL: @test_simplify3(
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; ANY-NEXT: [[EXP2F:%.*]] = call float @exp2f(float [[X:%.*]]) [[NUW_RO:#[0-9]+]]
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; ANY-NEXT: ret float [[EXP2F]]
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;
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; CHECK-WIN-LABEL: @test_simplify3(
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; CHECK-WIN-NEXT: [[POW:%.*]] = call float @powf(float 2.000000e+00, float [[X:%.*]])
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; CHECK-WIN-NEXT: ret float [[POW]]
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;
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%retval = call float @powf(float 2.0, float %x)
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ret float %retval
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}
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define double @test_simplify3n(double %x) {
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; ANY-LABEL: @test_simplify3n(
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; ANY-NEXT: [[MUL:%.*]] = fmul double [[X:%.*]], -2.000000e+00
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; ANY-NEXT: [[EXP2:%.*]] = call double @exp2(double [[MUL]]) [[NUW_RO]]
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; ANY-NEXT: ret double [[EXP2]]
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;
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; CHECK-WIN-LABEL: @test_simplify3n(
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; CHECK-WIN-NEXT: [[POW:%.*]] = call double @pow(double 2.500000e-01, double [[X:%.*]])
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; CHECK-WIN-NEXT: ret double [[POW]]
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;
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%retval = call double @pow(double 0.25, double %x)
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ret double %retval
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}
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define <2 x float> @test_simplify3v(<2 x float> %x) {
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; ANY-LABEL: @test_simplify3v(
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; ANY-NEXT: [[EXP2:%.*]] = call <2 x float> @llvm.exp2.v2f32(<2 x float> [[X:%.*]])
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; ANY-NEXT: ret <2 x float> [[EXP2]]
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;
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; CHECK-WIN-LABEL: @test_simplify3v(
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; CHECK-WIN-NEXT: [[POW:%.*]] = call <2 x float> @llvm.pow.v2f32(<2 x float> <float 2.000000e+00, float 2.000000e+00>, <2 x float> [[X:%.*]])
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; CHECK-WIN-NEXT: ret <2 x float> [[POW]]
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;
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%retval = call <2 x float> @llvm.pow.v2f32(<2 x float> <float 2.0, float 2.0>, <2 x float> %x)
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ret <2 x float> %retval
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}
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define <2 x double> @test_simplify3vn(<2 x double> %x) {
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; ANY-LABEL: @test_simplify3vn(
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; ANY-NEXT: [[MUL:%.*]] = fmul <2 x double> [[X:%.*]], <double 2.000000e+00, double 2.000000e+00>
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; ANY-NEXT: [[EXP2:%.*]] = call <2 x double> @llvm.exp2.v2f64(<2 x double> [[MUL]])
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; ANY-NEXT: ret <2 x double> [[EXP2]]
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;
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%retval = call <2 x double> @llvm.pow.v2f64(<2 x double> <double 4.0, double 4.0>, <2 x double> %x)
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ret <2 x double> %retval
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}
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define double @test_simplify4(double %x) {
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; ANY-LABEL: @test_simplify4(
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; ANY-NEXT: [[EXP2:%.*]] = call double @exp2(double [[X:%.*]]) [[NUW_RO]]
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; ANY-NEXT: ret double [[EXP2]]
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;
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; CHECK-WIN-LABEL: @test_simplify4(
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; CHECK-WIN-NEXT: [[POW:%.*]] = call double @pow(double 2.000000e+00, double [[X:%.*]])
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; CHECK-WIN-NEXT: ret double [[POW]]
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;
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%retval = call double @pow(double 2.0, double %x)
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ret double %retval
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}
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define float @test_simplify4n(float %x) {
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; ANY-LABEL: @test_simplify4n(
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; ANY-NEXT: [[MUL:%.*]] = fmul float [[X:%.*]], 3.000000e+00
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; ANY-NEXT: [[EXP2F:%.*]] = call float @exp2f(float [[MUL]]) [[NUW_RO]]
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; ANY-NEXT: ret float [[EXP2F]]
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;
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; CHECK-WIN-LABEL: @test_simplify4n(
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; CHECK-WIN-NEXT: [[POW:%.*]] = call float @powf(float 8.000000e+00, float [[X:%.*]])
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; CHECK-WIN-NEXT: ret float [[POW]]
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;
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%retval = call float @powf(float 8.0, float %x)
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ret float %retval
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}
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define <2 x double> @test_simplify4v(<2 x double> %x) {
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; ANY-LABEL: @test_simplify4v(
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; ANY-NEXT: [[EXP2:%.*]] = call <2 x double> @llvm.exp2.v2f64(<2 x double> [[X:%.*]])
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; ANY-NEXT: ret <2 x double> [[EXP2]]
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;
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; CHECK-WIN-LABEL: @test_simplify4v(
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; CHECK-WIN-NEXT: [[POW:%.*]] = call <2 x double> @llvm.pow.v2f64(<2 x double> <double 2.000000e+00, double 2.000000e+00>, <2 x double> [[X:%.*]])
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; CHECK-WIN-NEXT: ret <2 x double> [[POW]]
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;
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%retval = call <2 x double> @llvm.pow.v2f64(<2 x double> <double 2.0, double 2.0>, <2 x double> %x)
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ret <2 x double> %retval
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}
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define <2 x float> @test_simplify4vn(<2 x float> %x) {
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; ANY-LABEL: @test_simplify4vn(
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; ANY-NEXT: [[MUL:%.*]] = fsub <2 x float> <float -0.000000e+00, float -0.000000e+00>, [[X:%.*]]
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; ANY-NEXT: [[EXP2:%.*]] = call <2 x float> @llvm.exp2.v2f32(<2 x float> [[MUL]])
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; ANY-NEXT: ret <2 x float> [[EXP2]]
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;
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; CHECK-WIN-LABEL: @test_simplify4vn(
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; CHECK-WIN-NEXT: [[POW:%.*]] = call <2 x float> @llvm.pow.v2f32(<2 x float> <float 5.000000e-01, float 5.000000e-01>, <2 x float> [[X:%.*]])
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; CHECK-WIN-NEXT: ret <2 x float> [[POW]]
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;
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%retval = call <2 x float> @llvm.pow.v2f32(<2 x float> <float 0.5, float 0.5>, <2 x float> %x)
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ret <2 x float> %retval
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}
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; Check pow(x, 0.0) -> 1.0.
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define float @test_simplify5(float %x) {
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; ANY-LABEL: @test_simplify5(
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; ANY-NEXT: ret float 1.000000e+00
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;
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%retval = call float @powf(float %x, float 0.0)
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ret float %retval
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}
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define <2 x float> @test_simplify5v(<2 x float> %x) {
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; ANY-LABEL: @test_simplify5v(
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; ANY-NEXT: ret <2 x float> <float 1.000000e+00, float 1.000000e+00>
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;
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%retval = call <2 x float> @llvm.pow.v2f32(<2 x float> %x, <2 x float> <float 0.0, float 0.0>)
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ret <2 x float> %retval
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}
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define double @test_simplify6(double %x) {
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; ANY-LABEL: @test_simplify6(
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; ANY-NEXT: ret double 1.000000e+00
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;
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%retval = call double @pow(double %x, double 0.0)
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ret double %retval
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}
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define <2 x double> @test_simplify6v(<2 x double> %x) {
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; ANY-LABEL: @test_simplify6v(
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; ANY-NEXT: ret <2 x double> <double 1.000000e+00, double 1.000000e+00>
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;
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%retval = call <2 x double> @llvm.pow.v2f64(<2 x double> %x, <2 x double> <double 0.0, double 0.0>)
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ret <2 x double> %retval
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}
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; Check pow(x, 0.5) -> fabs(sqrt(x)), where x != -infinity.
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define float @test_simplify7(float %x) {
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; ANY-LABEL: @test_simplify7(
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; ANY-NEXT: [[SQRTF:%.*]] = call float @sqrtf(float [[X:%.*]]) [[NUW_RO]]
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; ANY-NEXT: [[ABS:%.*]] = call float @llvm.fabs.f32(float [[SQRTF]])
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; ANY-NEXT: [[ISINF:%.*]] = fcmp oeq float [[X]], 0xFFF0000000000000
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; ANY-NEXT: [[TMP1:%.*]] = select i1 [[ISINF]], float 0x7FF0000000000000, float [[ABS]]
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; ANY-NEXT: ret float [[TMP1]]
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;
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%retval = call float @powf(float %x, float 0.5)
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ret float %retval
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}
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define double @test_simplify8(double %x) {
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; ANY-LABEL: @test_simplify8(
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; ANY-NEXT: [[SQRT:%.*]] = call double @sqrt(double [[X:%.*]]) [[NUW_RO]]
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; ANY-NEXT: [[ABS:%.*]] = call double @llvm.fabs.f64(double [[SQRT]])
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; ANY-NEXT: [[ISINF:%.*]] = fcmp oeq double [[X]], 0xFFF0000000000000
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; ANY-NEXT: [[TMP1:%.*]] = select i1 [[ISINF]], double 0x7FF0000000000000, double [[ABS]]
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; ANY-NEXT: ret double [[TMP1]]
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;
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%retval = call double @pow(double %x, double 0.5)
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ret double %retval
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}
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; Check pow(-infinity, 0.5) -> +infinity.
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define float @test_simplify9(float %x) {
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; ANY-LABEL: @test_simplify9(
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; ANY-NEXT: ret float 0x7FF0000000000000
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;
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%retval = call float @powf(float 0xFFF0000000000000, float 0.5)
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ret float %retval
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}
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define double @test_simplify10(double %x) {
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; ANY-LABEL: @test_simplify10(
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; ANY-NEXT: ret double 0x7FF0000000000000
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;
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%retval = call double @pow(double 0xFFF0000000000000, double 0.5)
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ret double %retval
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}
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; Check pow(x, 1.0) -> x.
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define float @test_simplify11(float %x) {
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; ANY-LABEL: @test_simplify11(
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; ANY-NEXT: ret float [[X:%.*]]
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;
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%retval = call float @powf(float %x, float 1.0)
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ret float %retval
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}
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define <2 x float> @test_simplify11v(<2 x float> %x) {
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; ANY-LABEL: @test_simplify11v(
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; ANY-NEXT: ret <2 x float> [[X:%.*]]
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;
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%retval = call <2 x float> @llvm.pow.v2f32(<2 x float> %x, <2 x float> <float 1.0, float 1.0>)
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ret <2 x float> %retval
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}
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define double @test_simplify12(double %x) {
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; ANY-LABEL: @test_simplify12(
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; ANY-NEXT: ret double [[X:%.*]]
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;
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%retval = call double @pow(double %x, double 1.0)
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ret double %retval
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}
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define <2 x double> @test_simplify12v(<2 x double> %x) {
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; ANY-LABEL: @test_simplify12v(
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; ANY-NEXT: ret <2 x double> [[X:%.*]]
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;
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%retval = call <2 x double> @llvm.pow.v2f64(<2 x double> %x, <2 x double> <double 1.0, double 1.0>)
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ret <2 x double> %retval
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}
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; Check pow(x, 2.0) -> x*x.
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define float @pow2_strict(float %x) {
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; ANY-LABEL: @pow2_strict(
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; ANY-NEXT: [[SQUARE:%.*]] = fmul float [[X:%.*]], [[X]]
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; ANY-NEXT: ret float [[SQUARE]]
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;
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%r = call float @powf(float %x, float 2.0)
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ret float %r
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}
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define <2 x float> @pow2_strictv(<2 x float> %x) {
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; ANY-LABEL: @pow2_strictv(
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; ANY-NEXT: [[SQUARE:%.*]] = fmul <2 x float> [[X:%.*]], [[X]]
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; ANY-NEXT: ret <2 x float> [[SQUARE]]
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;
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%r = call <2 x float> @llvm.pow.v2f32(<2 x float> %x, <2 x float> <float 2.0, float 2.0>)
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ret <2 x float> %r
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}
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define double @pow2_double_strict(double %x) {
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; ANY-LABEL: @pow2_double_strict(
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; ANY-NEXT: [[SQUARE:%.*]] = fmul double [[X:%.*]], [[X]]
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; ANY-NEXT: ret double [[SQUARE]]
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;
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%r = call double @pow(double %x, double 2.0)
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ret double %r
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}
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define <2 x double> @pow2_double_strictv(<2 x double> %x) {
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; ANY-LABEL: @pow2_double_strictv(
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; ANY-NEXT: [[SQUARE:%.*]] = fmul <2 x double> [[X:%.*]], [[X]]
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; ANY-NEXT: ret <2 x double> [[SQUARE]]
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;
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%r = call <2 x double> @llvm.pow.v2f64(<2 x double> %x, <2 x double> <double 2.0, double 2.0>)
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ret <2 x double> %r
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}
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; Don't drop the FMF - PR35601 ( https://bugs.llvm.org/show_bug.cgi?id=35601 )
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define float @pow2_fast(float %x) {
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; ANY-LABEL: @pow2_fast(
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; ANY-NEXT: [[SQUARE:%.*]] = fmul fast float [[X:%.*]], [[X]]
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; ANY-NEXT: ret float [[SQUARE]]
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;
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%r = call fast float @powf(float %x, float 2.0)
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ret float %r
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}
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; Check pow(x, -1.0) -> 1.0/x.
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define float @pow_neg1_strict(float %x) {
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; ANY-LABEL: @pow_neg1_strict(
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; ANY-NEXT: [[RECIPROCAL:%.*]] = fdiv float 1.000000e+00, [[X:%.*]]
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; ANY-NEXT: ret float [[RECIPROCAL]]
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;
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%r = call float @powf(float %x, float -1.0)
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ret float %r
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}
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define <2 x float> @pow_neg1_strictv(<2 x float> %x) {
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; ANY-LABEL: @pow_neg1_strictv(
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; ANY-NEXT: [[RECIPROCAL:%.*]] = fdiv <2 x float> <float 1.000000e+00, float 1.000000e+00>, [[X:%.*]]
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; ANY-NEXT: ret <2 x float> [[RECIPROCAL]]
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;
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%r = call <2 x float> @llvm.pow.v2f32(<2 x float> %x, <2 x float> <float -1.0, float -1.0>)
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ret <2 x float> %r
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}
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define double @pow_neg1_double_fast(double %x) {
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; ANY-LABEL: @pow_neg1_double_fast(
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; ANY-NEXT: [[RECIPROCAL:%.*]] = fdiv fast double 1.000000e+00, [[X:%.*]]
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; ANY-NEXT: ret double [[RECIPROCAL]]
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;
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%r = call fast double @pow(double %x, double -1.0)
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ret double %r
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}
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define <2 x double> @pow_neg1_double_fastv(<2 x double> %x) {
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; ANY-LABEL: @pow_neg1_double_fastv(
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; ANY-NEXT: [[RECIPROCAL:%.*]] = fdiv fast <2 x double> <double 1.000000e+00, double 1.000000e+00>, [[X:%.*]]
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; ANY-NEXT: ret <2 x double> [[RECIPROCAL]]
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;
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%r = call fast <2 x double> @llvm.pow.v2f64(<2 x double> %x, <2 x double> <double -1.0, double -1.0>)
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ret <2 x double> %r
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}
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define double @test_simplify17(double %x) {
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; ANY-LABEL: @test_simplify17(
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; ANY-NEXT: [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[X:%.*]])
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; ANY-NEXT: [[ABS:%.*]] = call double @llvm.fabs.f64(double [[SQRT]])
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; ANY-NEXT: [[ISINF:%.*]] = fcmp oeq double [[X]], 0xFFF0000000000000
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; ANY-NEXT: [[TMP1:%.*]] = select i1 [[ISINF]], double 0x7FF0000000000000, double [[ABS]]
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; ANY-NEXT: ret double [[TMP1]]
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;
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%retval = call double @llvm.pow.f64(double %x, double 0.5)
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ret double %retval
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}
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; Check pow(10.0, x) -> __exp10(x) on OS X 10.9+ and iOS 7.0+.
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define float @test_simplify18(float %x) {
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; CHECK-EXP10-LABEL: @test_simplify18(
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; CHECK-EXP10-NEXT: [[__EXP10F:%.*]] = call float @__exp10f(float [[X:%.*]]) [[NUW_RO]]
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; CHECK-EXP10-NEXT: ret float [[__EXP10F]]
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;
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; CHECK-NO-EXP10-LABEL: @test_simplify18(
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; CHECK-NO-EXP10-NEXT: [[RETVAL:%.*]] = call float @powf(float 1.000000e+01, float [[X:%.*]])
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; CHECK-NO-EXP10-NEXT: ret float [[RETVAL]]
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;
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%retval = call float @powf(float 10.0, float %x)
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ret float %retval
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}
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define double @test_simplify19(double %x) {
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; CHECK-EXP10-LABEL: @test_simplify19(
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; CHECK-EXP10-NEXT: [[__EXP10:%.*]] = call double @__exp10(double [[X:%.*]]) [[NUW_RO]]
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; CHECK-EXP10-NEXT: ret double [[__EXP10]]
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;
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; CHECK-NO-EXP10-LABEL: @test_simplify19(
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; CHECK-NO-EXP10-NEXT: [[RETVAL:%.*]] = call double @pow(double 1.000000e+01, double [[X:%.*]])
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; CHECK-NO-EXP10-NEXT: ret double [[RETVAL]]
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;
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%retval = call double @pow(double 10.0, double %x)
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ret double %retval
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}
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; CHECK-EXP10: attributes [[NUW_RO]] = { nounwind readonly }
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