Add regression test for efficient codegen of i32 x i32 -> hi32(i64) as

mulhs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23183 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/PowerPC/mulhs.ll b/test/CodeGen/PowerPC/mulhs.ll
new file mode 100644 (file)
index 0000000..cef169a
--- /dev/null
+++ b/test/CodeGen/PowerPC/mulhs.ll
@@ -0,0 +1,17 @@
+; All of these ands and shifts should be folded into rlwimi's
+; RUN: llvm-as < mulhs.ll | llc -march=ppc32 | not grep mulhwu && 
+; RUN: llvm-as < mulhs.ll | llc -march=ppc32 | not grep srawi && 
+; RUN: llvm-as < mulhs.ll | llc -march=ppc32 | not grep add && 
+; RUN: llvm-as < mulhs.ll | llc -march=ppc32 | grep mulhw | wc -l | grep 1
+
+implementation   ; Functions:
+
+int %mulhs(int %a, int %b) {
+entry:
+        %tmp.1 = cast int %a to ulong           ; <ulong> [#uses=1]
+        %tmp.3 = cast int %b to ulong           ; <ulong> [#uses=1]
+        %tmp.4 = mul ulong %tmp.3, %tmp.1       ; <ulong> [#uses=1]
+        %tmp.6 = shr ulong %tmp.4, ubyte 32     ; <ulong> [#uses=1]
+        %tmp.7 = cast ulong %tmp.6 to int       ; <int> [#uses=1]
+        ret int %tmp.7
+}