Fix PR18014

- When simplifying the mask generation for BLEND, check whether that mask is
  also consumed by other non-BLEND insns. If true, skip that simplification.

llvm-svn: 195476

1 files changed, 16 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/pr18014.ll b/llvm/test/CodeGen/X86/pr18014.ll
new file mode 100644
index 00000000000..e3860b88bf4
--- /dev/null
+++ b/llvm/test/CodeGen/X86/pr18014.ll
@@ -0,0 +1,16 @@
+; RUN: llc < %s -mtriple=x86_64-linux-pc -mcpu=penryn | FileCheck %s
+
+; Ensure PSRAD is generated as the condition is consumed by both PADD and
+; BLENDVPS. PAND requires all bits setting properly.
+
+define <4 x i32> @foo(<4 x i32>* %p, <4 x i1> %cond, <4 x i32> %v1, <4 x i32> %v2, <4 x i32> %v3) {
+  %sext_cond = sext <4 x i1> %cond to <4 x i32>
+  %t1 = add <4 x i32> %v1, %sext_cond
+  %t2 = select <4 x i1> %cond, <4 x i32> %v1, <4 x i32> %v2
+  store <4 x i32> %t2, <4 x i32>* %p
+  ret <4 x i32> %t1
+; CHECK: foo
+; CHECK: pslld
+; CHECK: psrad
+; CHECK: ret
+}