Don't fold double constant to an integer if dest type not integral
Summary:
I encountered this issue when constant folding during inlining tried to
fold away a bitcast of a double to an x86_mmx, which is not an integral
type. The test case exposes the same issue with a smaller code snippet
during early CSE.
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D18528
llvm-svn: 265367
diff --git a/llvm/test/CodeGen/X86/mmx-bitcast-fold.ll b/llvm/test/CodeGen/X86/mmx-bitcast-fold.ll
new file mode 100644
index 0000000..fc7ce73
--- /dev/null
+++ b/llvm/test/CodeGen/X86/mmx-bitcast-fold.ll
@@ -0,0 +1,12 @@
+; RUN: opt -mtriple=x86_64-- -early-cse < %s -S | FileCheck %s
+
+; CHECK: @foo(x86_mmx bitcast (double 0.000000e+00 to x86_mmx))
+
+define void @bar() {
+entry:
+ %0 = bitcast double 0.0 to x86_mmx
+ %1 = call x86_mmx @foo(x86_mmx %0)
+ ret void
+}
+
+declare x86_mmx @foo(x86_mmx)