Vendor import of llvm r114020 (from the release_28 branch):

http://llvm.org/svn/llvm-project/llvm/branches/release_28@114020

Approved by:	rpaulo (mentor)

1 files changed, 28 insertions, 0 deletions

diff --git a/test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll b/test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll
new file mode 100644
index 0000000..e5542ba
--- /dev/null
+++ b/test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll
@@ -0,0 +1,28 @@
+; RUN: llc < %s -verify-machineinstrs | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-darwin10.0.0"
+
+; This test exercises the alias checking in SimpleRegisterCoalescing::RemoveCopyByCommutingDef.
+
+define void @f(i32* %w, i32* %h, i8* %_this, i8* %image) nounwind ssp {
+  %x1 = tail call i64 @g(i8* %_this, i8* %image) nounwind ; <i64> [#uses=3]
+  %tmp1 = trunc i64 %x1 to i32                     ; <i32> [#uses=1]
+; CHECK: movl (%r{{.*}}), %
+  %x4 = load i32* %h, align 4                      ; <i32> [#uses=1]
+
+; The imull clobbers a 32-bit register.
+; CHECK: imull %{{...}}, %e[[CLOBBER:..]]
+  %x5 = mul nsw i32 %x4, %tmp1                      ; <i32> [#uses=1]
+
+; So we cannot use the corresponding 64-bit register anymore.
+; CHECK-NOT: shrq $32, %r[[CLOBBER]]
+  %btmp3 = lshr i64 %x1, 32                         ; <i64> [#uses=1]
+  %btmp4 = trunc i64 %btmp3 to i32                  ; <i32> [#uses=1]
+
+; CHECK: idiv
+  %x6 = sdiv i32 %x5, %btmp4                         ; <i32> [#uses=1]
+  store i32 %x6, i32* %w, align 4
+  ret void
+}
+
+declare i64 @g(i8*, i8*)