1 files changed, 17 insertions, 0 deletions
diff --git a/test/CodeGen/PowerPC/coalesce-ext.ll b/test/CodeGen/PowerPC/coalesce-ext.ll
new file mode 100644
index 00000000000..08a2cc773fd
--- /dev/null
+++ b/test/CodeGen/PowerPC/coalesce-ext.ll
@@ -0,0 +1,17 @@
+; RUN: llc -march=ppc64 < %s | FileCheck %s
+; Check that the peephole optimizer knows about sext and zext instructions.
+; CHECK: test1sext
+define i32 @test1sext(i64 %A, i64 %B, i32* %P, i64 *%P2) nounwind {
+  %C = add i64 %A, %B
+  ; CHECK: add [[SUM:r[0-9]+]], r3, r4
+  %D = trunc i64 %C to i32
+  %E = shl i64 %C, 32
+  %F = ashr i64 %E, 32
+  ; CHECK: extsw [[EXT:r[0-9]+]], [[SUM]]
+  store volatile i64 %F, i64 *%P2
+  ; CHECK: std [[EXT]]
+  store volatile i32 %D, i32* %P
+  ; Reuse low bits of extended register, don't extend live range of SUM.
+  ; CHECK: stw [[EXT]]
+  ret i32 %D
+}