Index: llvm/trunk/test/Transforms/InstCombine/pow-0.ll
===================================================================
--- llvm/trunk/test/Transforms/InstCombine/pow-0.ll
+++ llvm/trunk/test/Transforms/InstCombine/pow-0.ll
@@ -0,0 +1,60 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+; CHECK-LABEL: @zero(
+; CHECK-NEXT:  ret double 1.000000e+00
+define double @zero(double %value) {
+  %res = call double @llvm.pow.f64(double %value, double 0.000000e+00)
+  ret double %res
+}
+
+; CHECK-LABEL: @minus_zero(
+; CHECK-NEXT:  ret double 1.000000e+00
+define double @minus_zero(double %value) {
+  %res = call double @llvm.pow.f64(double %value, double -0.000000e+00)
+  ret double %res
+}
+
+; CHECK-LABEL: @fast_zero(
+; CHECK-NEXT:  ret double 1.000000e+00
+define double @fast_zero(double %value) {
+  %res = call fast double @llvm.pow.f64(double %value, double 0.000000e+00)
+  ret double %res
+}
+
+; CHECK-LABEL: @fast_minus_zero(
+; CHECK-NEXT:  ret double 1.000000e+00
+define double @fast_minus_zero(double %value) {
+  %res = call fast double @llvm.pow.f64(double %value, double -0.000000e+00)
+  ret double %res
+}
+
+; CHECK-LABEL: @vec_zero(
+; CHECK-NEXT:  ret <2 x double> <double 1.000000e+00, double 1.000000e+00>
+define <2 x double> @vec_zero(<2 x double> %value) {
+  %res = call <2 x double> @llvm.pow.v2f64(<2 x double> %value, <2 x double> <double 0.000000e+00, double 0.000000e+00>)
+  ret <2 x double> %res
+}
+
+; CHECK-LABEL: @vec_minus_zero(
+; CHECK-NEXT:  ret <2 x double> <double 1.000000e+00, double 1.000000e+00>
+define <2 x double> @vec_minus_zero(<2 x double> %value) {
+  %res = call <2 x double> @llvm.pow.v2f64(<2 x double> %value, <2 x double> <double -0.000000e+00, double -0.000000e+00>)
+  ret <2 x double> %res
+}
+
+; CHECK-LABEL: @vec_fast_zero(
+; CHECK-NEXT:  ret <2 x double> <double 1.000000e+00, double 1.000000e+00>
+define <2 x double> @vec_fast_zero(<2 x double> %value) {
+  %res = call fast <2 x double> @llvm.pow.v2f64(<2 x double> %value, <2 x double> <double 0.000000e+00, double 0.000000e+00>)
+  ret <2 x double> %res
+}
+
+; CHECK-LABEL: @vec_fast_minus_zero(
+; CHECK-NEXT:  ret <2 x double> <double 1.000000e+00, double 1.000000e+00>
+define <2 x double> @vec_fast_minus_zero(<2 x double> %value) {
+  %res = call fast <2 x double> @llvm.pow.v2f64(<2 x double> %value, <2 x double> <double -0.000000e+00, double -0.000000e+00>)
+  ret <2 x double> %res
+}
+
+declare double @llvm.pow.f64(double, double)
+declare <2 x double> @llvm.pow.v2f64(<2 x double>, <2 x double>)