Add tests to verfiy behaviour on windows

Signed-off-by: Kushal Pal <[email protected]>

Author: braw-lee

llvm/test/Transforms/InstCombine/win-fdim.ll

@@ -0,0 +1,20 @@
+; RUN: opt %s -passes=instcombine -S -mtriple=i386-pc-mingw32 | FileCheck %s --check-prefixes=CHECK,MINGW32
+
+define double @fdim_double() {
+; CHECK-LABEL: define double @fdim_double() {
+; MINGW32:    ret double 2.500000e+00
+;
+  %dim = call double @fdim(double 10.5, double 8.0)
+  ret double %dim
+}
+
+define float @fdim_float() {
+; CHECK-LABEL: define float @fdim_float() {
+; MINGW32:    ret float 0.000000e+00
+;
+  %dim = call float @fdimf(float 1.500000e+00, float 8.0)
+  ret float %dim
+}
+
+declare double @fdim(double, double)
+declare float @fdimf(float, float)