diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index b462aab..96b6aec 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -11912,18 +11912,24 @@
     return DAG.getNode(ISD::FCBRT, SDLoc(N), VT, N->getOperand(0), Flags);
   }
 
-  // Try to convert x ** (1/4) into square roots.
+  // Try to convert x ** (1/4) and x ** (3/4) into square roots.
   // x ** (1/2) is canonicalized to sqrt, so we do not bother with that case.
   // TODO: This could be extended (using a target hook) to handle smaller
   // power-of-2 fractional exponents.
-  if (ExponentC->getValueAPF().isExactlyValue(0.25)) {
+  bool ExponentIs025 = ExponentC->getValueAPF().isExactlyValue(0.25);
+  bool ExponentIs075 = ExponentC->getValueAPF().isExactlyValue(0.75);
+  if (ExponentIs025 || ExponentIs075) {
     // pow(-0.0, 0.25) = +0.0; sqrt(sqrt(-0.0)) = -0.0.
     // pow(-inf, 0.25) = +inf; sqrt(sqrt(-inf)) =  NaN.
+    // pow(-0.0, 0.75) = +0.0; sqrt(-0.0) * sqrt(sqrt(-0.0)) = +0.0.
+    // pow(-inf, 0.75) = +inf; sqrt(-inf) * sqrt(sqrt(-inf)) =  NaN.
     // For regular numbers, rounding may cause the results to differ.
     // Therefore, we require { nsz ninf afn } for this transform.
     // TODO: We could select out the special cases if we don't have nsz/ninf.
     SDNodeFlags Flags = N->getFlags();
-    if (!Flags.hasNoSignedZeros() || !Flags.hasNoInfs() ||
+
+    // We only need no signed zeros for the 0.25 case.
+    if ((!Flags.hasNoSignedZeros() && ExponentIs025) || !Flags.hasNoInfs() ||
         !Flags.hasApproximateFuncs())
       return SDValue();
 
@@ -11939,7 +11945,11 @@
     // pow(X, 0.25) --> sqrt(sqrt(X))
     SDLoc DL(N);
     SDValue Sqrt = DAG.getNode(ISD::FSQRT, DL, VT, N->getOperand(0), Flags);
-    return DAG.getNode(ISD::FSQRT, DL, VT, Sqrt, Flags);
+    SDValue SqrtSqrt = DAG.getNode(ISD::FSQRT, DL, VT, Sqrt, Flags);
+    if (ExponentIs025)
+      return SqrtSqrt;
+    // pow(X, 0.75) --> sqrt(X) * sqrt(sqrt(X))
+    return DAG.getNode(ISD::FMUL, DL, VT, Sqrt, SqrtSqrt, Flags);
   }
 
   return SDValue();
diff --git a/test/CodeGen/AArch64/pow.75.ll b/test/CodeGen/AArch64/pow.75.ll
new file mode 100644
index 0000000..4ceb7d9
--- /dev/null
+++ b/test/CodeGen/AArch64/pow.75.ll
@@ -0,0 +1,48 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=aarch64-- -debug 2>&1 | FileCheck %s
+; REQUIRES: asserts
+
+declare float @llvm.pow.f32(float, float)
+declare <4 x float> @llvm.pow.v4f32(<4 x float>, <4 x float>)
+declare double @llvm.pow.f64(double, double)
+declare <2 x double> @llvm.pow.v2f64(<2 x double>, <2 x double>)
+
+define float @pow_f32_three_fourth_fmf(float %x) nounwind {
+; CHECK: Combining: {{.*}}: f32 = fpow ninf nsz afn [[X:t[0-9]+]], ConstantFP:f32<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f32 = fsqrt ninf nsz afn [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f32 = fsqrt ninf nsz afn [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f32 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f32 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+  %r = call nsz ninf afn float @llvm.pow.f32(float %x, float 7.5e-01)
+  ret float %r
+}
+
+define double @pow_f64_three_fourth_fmf(double %x) nounwind {
+; CHECK: Combining: {{.*}}: f64 = fpow ninf nsz afn [[X:t[0-9]+]], ConstantFP:f64<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f64 = fsqrt ninf nsz afn [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f64 = fsqrt ninf nsz afn [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f64 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f64 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+  %r = call nsz ninf afn double @llvm.pow.f64(double %x, double 7.5e-01)
+  ret double %r
+}
+
+define <4 x float> @pow_v4f32_three_fourth_fmf(<4 x float> %x) nounwind {
+; CHECK: Combining: {{.*}}: v4f32 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], {{.*}}
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: v4f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: v4f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: v4f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: v4f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+  %r = call fast <4 x float> @llvm.pow.v4f32(<4 x float> %x, <4 x float> <float 7.5e-1, float 7.5e-1, float 7.5e-01, float 7.5e-01>)
+  ret <4 x float> %r
+}
+
+define <2 x double> @pow_v2f64_three_fourth_fmf(<2 x double> %x) nounwind {
+; CHECK: Combining: {{.*}}: v2f64 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], {{.*}}
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: v2f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: v2f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: v2f64 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: v2f64 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+  %r = call fast <2 x double> @llvm.pow.v2f64(<2 x double> %x, <2 x double> <double 7.5e-1, double 7.5e-1>)
+  ret <2 x double> %r
+}
diff --git a/test/CodeGen/ARM/pow.75.ll b/test/CodeGen/ARM/pow.75.ll
new file mode 100644
index 0000000..32719f1
--- /dev/null
+++ b/test/CodeGen/ARM/pow.75.ll
@@ -0,0 +1,70 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=thumbv8-linux-gnueabihf -mattr=neon -debug 2>&1 | FileCheck %s
+; REQUIRES: asserts
+
+declare float @llvm.pow.f32(float, float)
+declare <4 x float> @llvm.pow.v4f32(<4 x float>, <4 x float>)
+declare double @llvm.pow.f64(double, double)
+declare <2 x double> @llvm.pow.v2f64(<2 x double>, <2 x double>)
+
+define float @pow_f32_three_fourth_fmf(float %x) nounwind {
+; CHECK: Combining: {{.*}}: f32 = fpow ninf nsz afn [[X:t[0-9]+]], ConstantFP:f32<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f32 = fsqrt ninf nsz afn [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f32 = fsqrt ninf nsz afn [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f32 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f32 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+  %r = call nsz ninf afn float @llvm.pow.f32(float %x, float 7.5e-01)
+  ret float %r
+}
+
+define double @pow_f64_three_fourth_fmf(double %x) nounwind {
+; CHECK: Combining: {{.*}}: f64 = fpow ninf nsz afn t2, ConstantFP:f64<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f64 = fsqrt ninf nsz afn [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f64 = fsqrt ninf nsz afn [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f64 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f64 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+  %r = call nsz ninf afn double @llvm.pow.f64(double %x, double 7.5e-01)
+  ret double %r
+}
+
+define <4 x float> @pow_v4f32_three_fourth_fmf(<4 x float> %x) nounwind {
+; CHECK: Combining: {{.*}}: v4f32 = BUILD_VECTOR [[FORTH:t[0-9]+]], [[THIRD:t[0-9]+]], [[SECOND:t[0-9]+]], [[FIRST:t[0-9]+]]
+; CHECK: Combining: [[FIRST]]: f32 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], ConstantFP:f32<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK: Combining: [[SECOND]]: f32 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], ConstantFP:f32<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK: Combining: [[THIRD]]: f32 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], ConstantFP:f32<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK: Combining: [[FORTH]]: f32 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], ConstantFP:f32<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+  %r = call fast <4 x float> @llvm.pow.v4f32(<4 x float> %x, <4 x float> <float 7.5e-1, float 7.5e-1, float 7.5e-01, float 7.5e-01>)
+  ret <4 x float> %r
+}
+
+define <2 x double> @pow_v2f64_three_fourth_fmf(<2 x double> %x) nounwind {
+; CHECK: Combining: {{.*}}: v2f64 = BUILD_VECTOR [[SECOND:t[0-9]+]], [[FIRST:t[0-9]+]]
+; CHECK: Combining: [[FIRST]]: f64 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], ConstantFP:f64<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f64 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT: ... into: [[R]]: f64 = fmul nnan ninf nsz arcp contract afn reassoc t16, t17
+; CHECK: Combining: [[SECOND]]: f64 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], ConstantFP:f64<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f64 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f64 = fmul nnan ninf nsz arcp contract afn reassoc t19, t20
+  %r = call fast <2 x double> @llvm.pow.v2f64(<2 x double> %x, <2 x double> <double 7.5e-1, double 7.5e-1>)
+  ret <2 x double> %r
+}
diff --git a/test/CodeGen/PowerPC/pow.75.ll b/test/CodeGen/PowerPC/pow.75.ll
new file mode 100644
index 0000000..c05afd3
--- /dev/null
+++ b/test/CodeGen/PowerPC/pow.75.ll
@@ -0,0 +1,48 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=powerpc64le-unknown-unknown -debug 2>&1 | FileCheck %s
+; REQUIRES: asserts
+
+declare float @llvm.pow.f32(float, float)
+declare <4 x float> @llvm.pow.v4f32(<4 x float>, <4 x float>)
+declare double @llvm.pow.f64(double, double)
+declare <2 x double> @llvm.pow.v2f64(<2 x double>, <2 x double>)
+
+define float @pow_f32_three_fourth_fmf(float %x) nounwind {
+; CHECK: Combining: {{.*}}: f32 = fpow ninf nsz afn [[X:t[0-9]+]], ConstantFP:f32<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f32 = fsqrt ninf nsz afn [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f32 = fsqrt ninf nsz afn [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f32 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f32 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+  %r = call nsz ninf afn float @llvm.pow.f32(float %x, float 7.5e-01)
+  ret float %r
+}
+
+define double @pow_f64_three_fourth_fmf(double %x) nounwind {
+; CHECK: Combining: {{.*}}: f64 = fpow ninf nsz afn [[X:t[0-9]+]], ConstantFP:f64<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f64 = fsqrt ninf nsz afn [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f64 = fsqrt ninf nsz afn [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f64 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f64 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+  %r = call nsz ninf afn double @llvm.pow.f64(double %x, double 7.5e-01)
+  ret double %r
+}
+
+define <4 x float> @pow_v4f32_three_fourth_fmf(<4 x float> %x) nounwind {
+; CHECK: Combining: {{.*}}: v4f32 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], {{.*}}
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: v4f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: v4f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: v4f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: v4f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+  %r = call fast <4 x float> @llvm.pow.v4f32(<4 x float> %x, <4 x float> <float 7.5e-1, float 7.5e-1, float 7.5e-01, float 7.5e-01>)
+  ret <4 x float> %r
+}
+
+define <2 x double> @pow_v2f64_three_fourth_fmf(<2 x double> %x) nounwind {
+; CHECK: Combining: {{.*}}: v2f64 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], {{.*}}
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: v2f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: v2f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: v2f64 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: v2f64 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+  %r = call fast <2 x double> @llvm.pow.v2f64(<2 x double> %x, <2 x double> <double 7.5e-1, double 7.5e-1>)
+  ret <2 x double> %r
+}
diff --git a/test/CodeGen/X86/pow.75.ll b/test/CodeGen/X86/pow.75.ll
new file mode 100644
index 0000000..5f4e228
--- /dev/null
+++ b/test/CodeGen/X86/pow.75.ll
@@ -0,0 +1,48 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-- -debug 2>&1 | FileCheck %s
+; REQUIRES: asserts
+
+declare float @llvm.pow.f32(float, float)
+declare <4 x float> @llvm.pow.v4f32(<4 x float>, <4 x float>)
+declare double @llvm.pow.f64(double, double)
+declare <2 x double> @llvm.pow.v2f64(<2 x double>, <2 x double>)
+
+define float @pow_f32_three_fourth_fmf(float %x) nounwind {
+; CHECK: Combining: {{.*}}: f32 = fpow ninf nsz afn [[X:t[0-9]+]], ConstantFP:f32<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f32 = fsqrt ninf nsz afn [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f32 = fsqrt ninf nsz afn [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f32 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f32 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+  %r = call nsz ninf afn float @llvm.pow.f32(float %x, float 7.5e-01)
+  ret float %r
+}
+
+define double @pow_f64_three_fourth_fmf(double %x) nounwind {
+; CHECK: Combining: {{.*}}: f64 = fpow ninf nsz afn [[X:t[0-9]+]], ConstantFP:f64<7.500000e-01>
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: f64 = fsqrt ninf nsz afn [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: f64 = fsqrt ninf nsz afn [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: f64 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: f64 = fmul ninf nsz afn [[SQRT]], [[SQRTSQRT]]
+  %r = call nsz ninf afn double @llvm.pow.f64(double %x, double 7.5e-01)
+  ret double %r
+}
+
+define <4 x float> @pow_v4f32_three_fourth_fmf(<4 x float> %x) nounwind {
+; CHECK: Combining: {{.*}}: v4f32 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], {{.*}}
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: v4f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: v4f32 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: v4f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: v4f32 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+  %r = call fast <4 x float> @llvm.pow.v4f32(<4 x float> %x, <4 x float> <float 7.5e-1, float 7.5e-1, float 7.5e-01, float 7.5e-01>)
+  ret <4 x float> %r
+}
+
+define <2 x double> @pow_v2f64_three_fourth_fmf(<2 x double> %x) nounwind {
+; CHECK: Combining: {{.*}}: v2f64 = fpow nnan ninf nsz arcp contract afn reassoc [[X:t[0-9]+]], {{.*}}
+; CHECK-NEXT: Creating new node: [[SQRT:t[0-9]+]]: v2f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[X]]
+; CHECK-NEXT: Creating new node: [[SQRTSQRT:t[0-9]+]]: v2f64 = fsqrt nnan ninf nsz arcp contract afn reassoc [[SQRT]]
+; CHECK-NEXT: Creating new node: [[R:t[0-9]+]]: v2f64 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+; CHECK-NEXT:  ... into: [[R]]: v2f64 = fmul nnan ninf nsz arcp contract afn reassoc [[SQRT]], [[SQRTSQRT]]
+  %r = call fast <2 x double> @llvm.pow.v2f64(<2 x double> %x, <2 x double> <double 7.5e-1, double 7.5e-1>)
+  ret <2 x double> %r
+}