mirror of
https://github.com/c64scene-ar/llvm-6502.git
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8b6d60f94b
are operations that do not access memory but may be sensitive to floating-point environment changes. LLVM does not attempt to model FP environment changes, so this was unnecessarily conservative and was getting on the way of some optimizations, in particular SLP vectorization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203037 91177308-0d34-0410-b5e6-96231b3b80d8
193 lines
6.4 KiB
LLVM
193 lines
6.4 KiB
LLVM
; Test that the pow library call simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; RUN: opt -instcombine -S < %s -mtriple=x86_64-apple-macosx10.9 | FileCheck %s --check-prefix=CHECK-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=arm-apple-ios7.0 | FileCheck %s --check-prefix=CHECK-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=x86_64-apple-macosx10.8 | FileCheck %s --check-prefix=CHECK-NO-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=arm-apple-ios6.0 | FileCheck %s --check-prefix=CHECK-NO-EXP10
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; RUN: opt -instcombine -S < %s -mtriple=x86_64-netbsd | FileCheck %s --check-prefix=CHECK-NO-EXP10
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; rdar://7251832
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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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; Check pow(1.0, x) -> 1.0.
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define float @test_simplify1(float %x) {
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; CHECK-LABEL: @test_simplify1(
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%retval = call float @powf(float 1.0, float %x)
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ret float %retval
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; CHECK-NEXT: ret float 1.000000e+00
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}
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define double @test_simplify2(double %x) {
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; CHECK-LABEL: @test_simplify2(
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%retval = call double @pow(double 1.0, double %x)
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ret double %retval
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; CHECK-NEXT: ret double 1.000000e+00
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}
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; Check pow(2.0, x) -> exp2(x).
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define float @test_simplify3(float %x) {
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; CHECK-LABEL: @test_simplify3(
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%retval = call float @powf(float 2.0, float %x)
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; CHECK-NEXT: [[EXP2F:%[a-z0-9]+]] = call float @exp2f(float %x) [[NUW_RO:#[0-9]+]]
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ret float %retval
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; CHECK-NEXT: ret float [[EXP2F]]
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}
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define double @test_simplify4(double %x) {
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; CHECK-LABEL: @test_simplify4(
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%retval = call double @pow(double 2.0, double %x)
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; CHECK-NEXT: [[EXP2:%[a-z0-9]+]] = call double @exp2(double %x) [[NUW_RO]]
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ret double %retval
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; CHECK-NEXT: ret double [[EXP2]]
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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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; CHECK-LABEL: @test_simplify5(
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%retval = call float @powf(float %x, float 0.0)
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ret float %retval
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; CHECK-NEXT: ret float 1.000000e+00
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}
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define double @test_simplify6(double %x) {
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; CHECK-LABEL: @test_simplify6(
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%retval = call double @pow(double %x, double 0.0)
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ret double %retval
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; CHECK-NEXT: ret double 1.000000e+00
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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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; CHECK-LABEL: @test_simplify7(
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%retval = call float @powf(float %x, float 0.5)
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; CHECK-NEXT: [[SQRTF:%[a-z0-9]+]] = call float @sqrtf(float %x) [[NUW_RO]]
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; CHECK-NEXT: [[FABSF:%[a-z0-9]+]] = call float @fabsf(float [[SQRTF]]) [[NUW_RO]]
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; CHECK-NEXT: [[FCMP:%[a-z0-9]+]] = fcmp oeq float %x, 0xFFF0000000000000
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; CHECK-NEXT: [[SELECT:%[a-z0-9]+]] = select i1 [[FCMP]], float 0x7FF0000000000000, float [[FABSF]]
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ret float %retval
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; CHECK-NEXT: ret float [[SELECT]]
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}
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define double @test_simplify8(double %x) {
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; CHECK-LABEL: @test_simplify8(
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%retval = call double @pow(double %x, double 0.5)
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; CHECK-NEXT: [[SQRT:%[a-z0-9]+]] = call double @sqrt(double %x) [[NUW_RO]]
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; CHECK-NEXT: [[FABS:%[a-z0-9]+]] = call double @fabs(double [[SQRT]]) [[NUW_RO]]
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; CHECK-NEXT: [[FCMP:%[a-z0-9]+]] = fcmp oeq double %x, 0xFFF0000000000000
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; CHECK-NEXT: [[SELECT:%[a-z0-9]+]] = select i1 [[FCMP]], double 0x7FF0000000000000, double [[FABS]]
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ret double %retval
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; CHECK-NEXT: ret double [[SELECT]]
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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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; CHECK-LABEL: @test_simplify9(
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%retval = call float @powf(float 0xFFF0000000000000, float 0.5)
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ret float %retval
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; CHECK-NEXT: ret float 0x7FF0000000000000
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}
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define double @test_simplify10(double %x) {
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; CHECK-LABEL: @test_simplify10(
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%retval = call double @pow(double 0xFFF0000000000000, double 0.5)
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ret double %retval
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; CHECK-NEXT: ret double 0x7FF0000000000000
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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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; CHECK-LABEL: @test_simplify11(
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%retval = call float @powf(float %x, float 1.0)
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ret float %retval
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; CHECK-NEXT: ret float %x
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}
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define double @test_simplify12(double %x) {
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; CHECK-LABEL: @test_simplify12(
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%retval = call double @pow(double %x, double 1.0)
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ret double %retval
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; CHECK-NEXT: ret double %x
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}
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; Check pow(x, 2.0) -> x*x.
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define float @test_simplify13(float %x) {
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; CHECK-LABEL: @test_simplify13(
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%retval = call float @powf(float %x, float 2.0)
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; CHECK-NEXT: [[SQUARE:%[a-z0-9]+]] = fmul float %x, %x
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ret float %retval
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; CHECK-NEXT: ret float [[SQUARE]]
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}
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define double @test_simplify14(double %x) {
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; CHECK-LABEL: @test_simplify14(
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%retval = call double @pow(double %x, double 2.0)
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; CHECK-NEXT: [[SQUARE:%[a-z0-9]+]] = fmul double %x, %x
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ret double %retval
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; CHECK-NEXT: ret double [[SQUARE]]
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}
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; Check pow(x, -1.0) -> 1.0/x.
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define float @test_simplify15(float %x) {
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; CHECK-LABEL: @test_simplify15(
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%retval = call float @powf(float %x, float -1.0)
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; CHECK-NEXT: [[RECIPROCAL:%[a-z0-9]+]] = fdiv float 1.000000e+00, %x
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ret float %retval
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; CHECK-NEXT: ret float [[RECIPROCAL]]
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}
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define double @test_simplify16(double %x) {
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; CHECK-LABEL: @test_simplify16(
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%retval = call double @pow(double %x, double -1.0)
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; CHECK-NEXT: [[RECIPROCAL:%[a-z0-9]+]] = fdiv double 1.000000e+00, %x
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ret double %retval
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; CHECK-NEXT: ret double [[RECIPROCAL]]
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}
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declare double @llvm.pow.f64(double %Val, double %Power)
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define double @test_simplify17(double %x) {
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; CHECK-LABEL: @test_simplify17(
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%retval = call double @llvm.pow.f64(double %x, double 0.5)
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; CHECK-NEXT: [[SQRT:%[a-z0-9]+]] = call double @sqrt(double %x)
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; CHECK-NEXT: [[FABS:%[a-z0-9]+]] = call double @fabs(double [[SQRT]])
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; CHECK-NEXT: [[FCMP:%[a-z0-9]+]] = fcmp oeq double %x, 0xFFF0000000000000
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; CHECK-NEXT: [[SELECT:%[a-z0-9]+]] = select i1 [[FCMP]], double 0x7FF0000000000000, double [[FABS]]
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ret double %retval
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; CHECK-NEXT: ret double [[SELECT]]
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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-LABEL: @test_simplify18(
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%retval = call float @powf(float 10.0, float %x)
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; CHECK-EXP10: [[EXP10F:%[_a-z0-9]+]] = call float @__exp10f(float %x) [[NUW_RO:#[0-9]+]]
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ret float %retval
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; CHECK-EXP10: ret float [[EXP10F]]
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; CHECK-NO-EXP10: call float @powf
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}
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define double @test_simplify19(double %x) {
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; CHECK-LABEL: @test_simplify19(
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%retval = call double @pow(double 10.0, double %x)
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; CHECK-EXP10: [[EXP10:%[_a-z0-9]+]] = call double @__exp10(double %x) [[NUW_RO]]
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ret double %retval
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; CHECK-EXP10: ret double [[EXP10]]
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; CHECK-NO-EXP10: call double @pow
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}
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; CHECK: attributes [[NUW_RO]] = { nounwind readonly }
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