[SLC] Test simplification of pow(x, 0.333...) to cbrt(x) (NFC)

Add test case for simplifying `pow(x, 0.333...)` into `cbrt(x)`, which
D49040 enables.

llvm-svn: 338152

1 files changed, 117 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/pow-cbrt.ll b/llvm/test/Transforms/InstCombine/pow-cbrt.ll
new file mode 100644
index 00000000000..00fa510b04e
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/pow-cbrt.ll
@@ -0,0 +1,117 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define double @pow_intrinsic_third_fast(double %x) {
+; CHECK-LABEL: @pow_intrinsic_third_fast(
+; CHECK-NEXT:    [[POW:%.*]] = call fast double @llvm.pow.f64(double [[X:%.*]], double 0x3FD5555555555555)
+; CHECK-NEXT:    ret double [[POW]]
+;
+  %pow = call fast double @llvm.pow.f64(double %x, double 0x3fd5555555555555)
+  ret double %pow
+}
+
+define float @powf_intrinsic_third_fast(float %x) {
+; CHECK-LABEL: @powf_intrinsic_third_fast(
+; CHECK-NEXT:    [[POW:%.*]] = call fast float @llvm.pow.f32(float [[X:%.*]], float 0x3FD5555560000000)
+; CHECK-NEXT:    ret float [[POW]]
+;
+  %pow = call fast float @llvm.pow.f32(float %x, float 0x3fd5555560000000)
+  ret float %pow
+}
+
+define double @pow_intrinsic_third_approx(double %x) {
+; CHECK-LABEL: @pow_intrinsic_third_approx(
+; CHECK-NEXT:    [[POW:%.*]] = call afn double @llvm.pow.f64(double [[X:%.*]], double 0x3FD5555555555555)
+; CHECK-NEXT:    ret double [[POW]]
+;
+  %pow = call afn double @llvm.pow.f64(double %x, double 0x3fd5555555555555)
+  ret double %pow
+}
+
+define float @powf_intrinsic_third_approx(float %x) {
+; CHECK-LABEL: @powf_intrinsic_third_approx(
+; CHECK-NEXT:    [[POW:%.*]] = call afn float @llvm.pow.f32(float [[X:%.*]], float 0x3FD5555560000000)
+; CHECK-NEXT:    ret float [[POW]]
+;
+  %pow = call afn float @llvm.pow.f32(float %x, float 0x3fd5555560000000)
+  ret float %pow
+}
+
+define double @pow_libcall_third_fast(double %x) {
+; CHECK-LABEL: @pow_libcall_third_fast(
+; CHECK-NEXT:    [[POW:%.*]] = call fast double @pow(double [[X:%.*]], double 0x3FD5555555555555)
+; CHECK-NEXT:    ret double [[POW]]
+;
+  %pow = call fast double @pow(double %x, double 0x3fd5555555555555)
+  ret double %pow
+}
+
+define float @powf_libcall_third_fast(float %x) {
+; CHECK-LABEL: @powf_libcall_third_fast(
+; CHECK-NEXT:    [[POW:%.*]] = call fast float @powf(float [[X:%.*]], float 0x3FD5555560000000)
+; CHECK-NEXT:    ret float [[POW]]
+;
+  %pow = call fast float @powf(float %x, float 0x3fd5555560000000)
+  ret float %pow
+}
+
+define double @pow_intrinsic_negthird_fast(double %x) {
+; CHECK-LABEL: @pow_intrinsic_negthird_fast(
+; CHECK-NEXT:    [[POW:%.*]] = call fast double @llvm.pow.f64(double [[X:%.*]], double 0xBFD5555555555555)
+; CHECK-NEXT:    ret double [[POW]]
+;
+  %pow = call fast double @llvm.pow.f64(double %x, double 0xbfd5555555555555)
+  ret double %pow
+}
+
+define float @powf_intrinsic_negthird_fast(float %x) {
+; CHECK-LABEL: @powf_intrinsic_negthird_fast(
+; CHECK-NEXT:    [[POW:%.*]] = call fast float @llvm.pow.f32(float [[X:%.*]], float 0xBFD5555560000000)
+; CHECK-NEXT:    ret float [[POW]]
+;
+  %pow = call fast float @llvm.pow.f32(float %x, float 0xbfd5555560000000)
+  ret float %pow
+}
+
+define double @pow_intrinsic_negthird_approx(double %x) {
+; CHECK-LABEL: @pow_intrinsic_negthird_approx(
+; CHECK-NEXT:    [[POW:%.*]] = call afn double @llvm.pow.f64(double [[X:%.*]], double 0xBFD5555555555555)
+; CHECK-NEXT:    ret double [[POW]]
+;
+  %pow = call afn double @llvm.pow.f64(double %x, double 0xbfd5555555555555)
+  ret double %pow
+}
+
+define float @powf_intrinsic_negthird_approx(float %x) {
+; CHECK-LABEL: @powf_intrinsic_negthird_approx(
+; CHECK-NEXT:    [[POW:%.*]] = call afn float @llvm.pow.f32(float [[X:%.*]], float 0xBFD5555560000000)
+; CHECK-NEXT:    ret float [[POW]]
+;
+  %pow = call afn float @llvm.pow.f32(float %x, float 0xbfd5555560000000)
+  ret float %pow
+}
+
+define double @pow_libcall_negthird_fast(double %x) {
+; CHECK-LABEL: @pow_libcall_negthird_fast(
+; CHECK-NEXT:    [[POW:%.*]] = call fast double @pow(double [[X:%.*]], double 0xBFD5555555555555)
+; CHECK-NEXT:    ret double [[POW]]
+;
+  %pow = call fast double @pow(double %x, double 0xbfd5555555555555)
+  ret double %pow
+}
+
+define float @powf_libcall_negthird_fast(float %x) {
+; CHECK-LABEL: @powf_libcall_negthird_fast(
+; CHECK-NEXT:    [[POW:%.*]] = call fast float @powf(float [[X:%.*]], float 0xBFD5555560000000)
+; CHECK-NEXT:    ret float [[POW]]
+;
+  %pow = call fast float @powf(float %x, float 0xbfd5555560000000)
+  ret float %pow
+}
+
+declare double @llvm.pow.f64(double, double) #0
+declare float @llvm.pow.f32(float, float) #0
+declare double @pow(double, double)
+declare float @powf(float, float)
+
+attributes #0 = { nounwind readnone speculatable }