Vendor import of llvm RELEASE_350/final tag r216957 (effectively, 3.5.0 release):vendor/llvm/llvm-release_350-r216957

https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_350/final@216957

1 files changed, 59 insertions, 0 deletions

diff --git a/test/CodeGen/AArch64/arm64-cse.ll b/test/CodeGen/AArch64/arm64-cse.ll
new file mode 100644
index 000000000000..5d62cfe76a84
--- /dev/null
+++ b/test/CodeGen/AArch64/arm64-cse.ll
@@ -0,0 +1,59 @@
+; RUN: llc -O3 < %s -aarch64-atomic-cfg-tidy=0 | FileCheck %s
+target triple = "arm64-apple-ios"
+
+; rdar://12462006
+; CSE between "icmp reg reg" and "sub reg reg".
+; Both can be in the same basic block or in different basic blocks.
+define i8* @t1(i8* %base, i32* nocapture %offset, i32 %size) nounwind {
+entry:
+; CHECK-LABEL: t1:
+; CHECK: subs
+; CHECK-NOT: cmp
+; CHECK-NOT: sub
+; CHECK: b.ge
+; CHECK: sub
+; CHECK: sub
+; CHECK-NOT: sub
+; CHECK: ret
+ %0 = load i32* %offset, align 4
+ %cmp = icmp slt i32 %0, %size
+ %s = sub nsw i32 %0, %size
+ br i1 %cmp, label %return, label %if.end
+
+if.end:
+ %sub = sub nsw i32 %0, %size
+ %s2 = sub nsw i32 %s, %size
+ %s3 = sub nsw i32 %sub, %s2
+ store i32 %s3, i32* %offset, align 4
+ %add.ptr = getelementptr inbounds i8* %base, i32 %sub
+ br label %return
+
+return:
+ %retval.0 = phi i8* [ %add.ptr, %if.end ], [ null, %entry ]
+ ret i8* %retval.0
+}
+
+; CSE between "icmp reg imm" and "sub reg imm".
+define i8* @t2(i8* %base, i32* nocapture %offset) nounwind {
+entry:
+; CHECK-LABEL: t2:
+; CHECK: subs
+; CHECK-NOT: cmp
+; CHECK-NOT: sub
+; CHECK: b.lt
+; CHECK-NOT: sub
+; CHECK: ret
+ %0 = load i32* %offset, align 4
+ %cmp = icmp slt i32 %0, 1
+ br i1 %cmp, label %return, label %if.end
+
+if.end:
+ %sub = sub nsw i32 %0, 1
+ store i32 %sub, i32* %offset, align 4
+ %add.ptr = getelementptr inbounds i8* %base, i32 %sub
+ br label %return
+
+return:
+ %retval.0 = phi i8* [ %add.ptr, %if.end ], [ null, %entry ]
+ ret i8* %retval.0
+}