Canonicalize bitcasts between types like <1 x i64> and i64 to

insertelement/extractelement.

I'm not entirely sure this is precisely what we want to do: should we 
prefer bitcast(insertelement) or insertelement(bitcast)?  Similarly. should we 
prefer extractelement(bitcast) or bitcast(extractelement)?

llvm-svn: 76345

1 files changed, 22 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/bitcast-vec-canon.ll b/llvm/test/Transforms/InstCombine/bitcast-vec-canon.ll
new file mode 100644
index 00000000000..6bb986a2eb9
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/bitcast-vec-canon.ll
@@ -0,0 +1,22 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep element | count 4
+
+define double @a(<1 x i64> %y) {
+  %c = bitcast <1 x i64> %y to double
+  ret double %c 
+}
+
+define i64 @b(<1 x i64> %y) {
+  %c = bitcast <1 x i64> %y to i64
+  ret i64 %c 
+}
+
+define <1 x i64> @c(double %y) {
+  %c = bitcast double %y to <1 x i64>
+  ret <1 x i64> %c
+}
+
+define <1 x i64> @d(i64 %y) {
+  %c = bitcast i64 %y to <1 x i64>
+  ret <1 x i64> %c
+}
+