Add a testcase for r228432.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228951 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/Inline/inline-fast-math-flags.ll

@@ -0,0 +1,34 @@
+; RUN: opt < %s -S -inline -inline-threshold=20 | FileCheck %s
+; Check that we don't drop FastMathFlag when estimating inlining profitability.
+;
+; In this test we should inline 'foo'  to 'boo', because it'll fold to a
+; constant.
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+
+define float @foo(float* %a, float %b) {
+entry:
+  %a0 = load float* %a, align 4
+  %mul = fmul fast float %a0, %b
+  %tobool = fcmp une float %mul, 0.000000e+00
+  br i1 %tobool, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %a1 = load float* %a, align 8
+  %arrayidx1 = getelementptr inbounds float* %a, i64 1
+  %a2 = load float* %arrayidx1, align 4
+  %add = fadd fast float %a1, %a2
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  %storemerge = phi float [ %add, %if.then ], [ 1.000000e+00, %entry ]
+  ret float %storemerge
+}
+
+; CHECK-LABEL: @boo
+; CHECK-NOT: call float @foo
+define float @boo(float* %a) {
+entry:
+  %call = call float @foo(float* %a, float 0.000000e+00)
+  ret float %call
+}