Apply an InstCombine backport via rust-lang/llvm#51

Author: cuviper

0001-Backport-rL281650.patch

@@ -0,0 +1,55 @@
+From 7801978ec1f3637fcda1b564048ebc732bf586af Mon Sep 17 00:00:00 2001
+From: Simonas Kazlauskas <[email protected]>
+Date: Fri, 16 Sep 2016 00:32:20 +0300
+Subject: [PATCH] Backport rL281650
+
+---
+ lib/Transforms/InstCombine/InstCombineCompares.cpp  |  2 +-
+ test/Transforms/InstCombine/indexed-gep-compares.ll | 20 ++++++++++++++++++++
+ 2 files changed, 21 insertions(+), 1 deletion(-)
+
+diff --git a/lib/Transforms/InstCombine/InstCombineCompares.cpp b/lib/Transforms/InstCombine/InstCombineCompares.cpp
+index bfd73f4bbac5..961497fe3c2d 100644
+--- a/lib/Transforms/InstCombine/InstCombineCompares.cpp
++++ b/lib/Transforms/InstCombine/InstCombineCompares.cpp
+@@ -634,7 +634,7 @@ static bool canRewriteGEPAsOffset(Value *Start, Value *Base,
+       }
+ 
+       if (!isa<IntToPtrInst>(V) && !isa<PtrToIntInst>(V) &&
+-          !isa<GEPOperator>(V) && !isa<PHINode>(V))
++          !isa<GetElementPtrInst>(V) && !isa<PHINode>(V))
+         // We've found some value that we can't explore which is different from
+         // the base. Therefore we can't do this transformation.
+         return false;
+diff --git a/test/Transforms/InstCombine/indexed-gep-compares.ll b/test/Transforms/InstCombine/indexed-gep-compares.ll
+index 495881549e25..64dff2712976 100644
+--- a/test/Transforms/InstCombine/indexed-gep-compares.ll
++++ b/test/Transforms/InstCombine/indexed-gep-compares.ll
+@@ -167,4 +167,24 @@ lpad:
+ ; CHECK:  ret i32* %[[PTR]]
+ }
+ 
++
++@pr30402 = constant i64 3
++define i1 @test7() {
++entry:
++  br label %bb7
++
++bb7:                                              ; preds = %bb10, %entry-block
++  %phi = phi i64* [ @pr30402, %entry ], [ getelementptr inbounds (i64, i64* @pr30402, i32 1), %bb7 ]
++  %cmp = icmp eq i64* %phi, getelementptr inbounds (i64, i64* @pr30402, i32 1)
++  br i1 %cmp, label %bb10, label %bb7
++
++bb10:
++  ret i1 %cmp
++}
++; CHECK-LABEL: @test7(
++; CHECK:  %[[phi:.*]] = phi i64* [ @pr30402, %entry ], [ getelementptr inbounds (i64, i64* @pr30402, i32 1), %bb7 ]
++; CHECK:  %[[cmp:.*]] = icmp eq i64* %[[phi]], getelementptr inbounds (i64, i64* @pr30402, i32 1)
++; CHECK: ret i1 %[[cmp]]
++
++
+ declare i32 @__gxx_personality_v0(...)
+-- 
+2.7.4
+

llvm.spec

@@ -7,7 +7,7 @@
 
 Name:		llvm
 Version:	3.9.0
-Release:	1%{?dist}
+Release:	2%{?dist}
 Summary:	The Low Level Virtual Machine
 
 License:	NCSA
@@ -23,6 +23,7 @@ Patch1:		0001-This-code-block-breaks-the-docs-build-http-lab.llvm..patch
 Patch2:		0001-fix-docs-2.patch
 Patch3:		0001-fix-docs-3.patch
 Patch4:		0001-docs-fix-cmake-code-block-warning.patch
+Patch5:		0001-Backport-rL281650.patch
 
 BuildRequires:	cmake
 BuildRequires:	zlib-devel
@@ -79,6 +80,7 @@ Static libraries for the LLVM compiler infrastructure.
 %patch2 -p1 -b .docs2
 %patch3 -p1 -b .docs3
 %patch4 -p1 -b .docs4
+%patch5 -p1 -b .rust1
 
 %build
 mkdir -p _build
@@ -194,6 +196,9 @@ make check-all || :
 %{_libdir}/*.a
 
 %changelog
+* Sat Oct 15 2016 Josh Stone <[email protected]> - 3.9.0-2
+- Apply an InstCombine backport via rust-lang/llvm#51
+
 * Wed Sep 07 2016 Dave Airlie <[email protected]> - 3.9.0-1
 - llvm 3.9.0
 - upstream moved where cmake files are packaged.