1 files changed, 62 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/log-pow.ll b/llvm/test/Transforms/InstCombine/log-pow.ll
new file mode 100644
index 00000000000..4e4a2b2612c
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/log-pow.ll
@@ -0,0 +1,62 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define double @log_pow(double %x, double %y) {
+  %pow = call fast double @llvm.pow.f64(double %x, double %y)
+  %call = call fast double @log(double %pow)
+  ret double %call
+}
+
+; CHECK-LABEL: define double @log_pow(
+; CHECK-NEXT:  %log = call fast double @log(double %x)
+; CHECK-NEXT:  %mul = fmul fast double %log, %y
+; CHECK-NEXT:  ret double %mul
+
+define double @log_pow_not_fast(double %x, double %y) {
+  %pow = call double @llvm.pow.f64(double %x, double %y)
+  %call = call fast double @log(double %pow)
+  ret double %call
+}
+
+; CHECK-LABEL: define double @log_pow_not_fast(
+; CHECK-NEXT:  %pow = call double @llvm.pow.f64(double %x, double %y)
+; CHECK-NEXT:  %call = call fast double @log(double %pow)
+; CHECK-NEXT:  ret double %call
+
+define double @function_pointer(double ()* %fptr, double %p1) {
+  %call1 = call double %fptr()
+  %pow = call double @log(double %call1)
+  ret double %pow
+}
+
+; CHECK-LABEL: @function_pointer
+; CHECK-NEXT:  %call1 = call double %fptr()
+; CHECK-NEXT:  %pow = call double @log(double %call1)
+; CHECK-NEXT:  ret double %pow
+
+define double @log_exp2(double %x) {
+  %call2 = call fast double @exp2(double %x)
+  %call3 = call fast double @log(double %call2)
+  ret double %call3
+}
+
+; CHECK-LABEL: @log_exp2
+; CHECK-NEXT:  %call2 = call fast double @exp2(double %x)
+; CHECK-NEXT:  %logmul = fmul fast double %x, 0x3FE62E42FEFA39EF
+; CHECK-NEXT:  ret double %logmul
+
+define double @log_exp2_not_fast(double %x) {
+  %call2 = call double @exp2(double %x)
+  %call3 = call fast double @log(double %call2)
+  ret double %call3
+}
+
+; CHECK-LABEL: @log_exp2_not_fast
+; CHECK-NEXT:  %call2 = call double @exp2(double %x)
+; CHECK-NEXT:  %call3 = call fast double @log(double %call2)
+; CHECK-NEXT:  ret double %call3
+
+declare double @log(double) #0
+declare double @exp2(double)
+declare double @llvm.pow.f64(double, double)
+
+attributes #0 = { nounwind readnone }