Fix a bug in the ComputeMaskedBits logic for multiply.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50793 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/test/Transforms/InstCombine/mul-masked-bits.ll b/test/Transforms/InstCombine/mul-masked-bits.ll
new file mode 100644
index 0000000..9b0a5bf
--- /dev/null
+++ b/test/Transforms/InstCombine/mul-masked-bits.ll
@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep ashr
+
+define i32 @foo(i32 %x, i32 %y) {
+  %a = and i32 %x, 7
+  %b = and i32 %y, 7
+  %c = mul i32 %a, %b
+  %d = shl i32 %c, 26
+  %e = ashr i32 %d, 26
+  ret i32 %e
+}