forked from OSchip/llvm-project
155 lines
4.6 KiB
LLVM
155 lines
4.6 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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; 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: @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: @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: @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: @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: @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: @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: @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: @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: @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: @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: @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: @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: @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: @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: @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: @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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; CHECK: attributes [[NUW_RO]] = { nounwind readonly }
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