From 486fa3977a01d77b06dcb2f8ff918f626a563a0d Mon Sep 17 00:00:00 2001
From: Reid Kleckner <reid@kleckner.net>
Date: Tue, 14 Jul 2015 00:11:08 +0000
Subject: Update enforceKnownAlignment after the isWeakForLinker semantic
 change

Previously we would refrain from attempting to increase the linkage of
available_externally globals because they were considered weak for the
linker. Now they are treated more like a declaration instead of a weak
definition.

This was causing SSE alignment faults in Chromuim, when some code
assumed it could increase the alignment of a dllimported global that it
didn't control.  http://crbug.com/509256

llvm-svn: 242091
---
 llvm/test/Transforms/InstCombine/align-external.ll | 26 ++++++++++++++++------
 1 file changed, 19 insertions(+), 7 deletions(-)

(limited to 'llvm/test/Transforms')

diff --git a/llvm/test/Transforms/InstCombine/align-external.ll b/llvm/test/Transforms/InstCombine/align-external.ll
index ee98a012017..15f3096105b 100644
--- a/llvm/test/Transforms/InstCombine/align-external.ll
+++ b/llvm/test/Transforms/InstCombine/align-external.ll
@@ -3,16 +3,14 @@
 ; Don't assume that external global variables or those with weak linkage have
 ; their preferred alignment. They may only have the ABI minimum alignment.
 
-; CHECK: %s = shl i64 %a, 3
-; CHECK: %r = or i64 %s, ptrtoint (i32* @A to i64)
-; CHECK: %q = add i64 %r, 1
-; CHECK: ret i64 %q
-
 target datalayout = "i32:8:32"
 
 @A = external global i32
 @B = weak_odr global i32 0
 
+@C = available_externally global <4 x i32> zeroinitializer, align 4
+; CHECK: @C = available_externally global <4 x i32> zeroinitializer, align 4
+
 define i64 @foo(i64 %a) {
   %t = ptrtoint i32* @A to i64
   %s = shl i64 %a, 3
@@ -21,9 +19,23 @@ define i64 @foo(i64 %a) {
   ret i64 %q
 }
 
+; CHECK-LABEL: define i64 @foo(i64 %a)
+; CHECK: %s = shl i64 %a, 3
+; CHECK: %r = or i64 %s, ptrtoint (i32* @A to i64)
+; CHECK: %q = add i64 %r, 1
+; CHECK: ret i64 %q
+
 define i32 @bar() {
-; CHECK-LABEL: @bar(
   %r = load i32, i32* @B, align 1
-; CHECK: align 1
   ret i32 %r
 }
+
+; CHECK-LABEL: @bar()
+; CHECK: align 1
+
+define void @vec_store() {
+  store <4 x i32> <i32 0, i32 1, i32 2, i32 3>, <4 x i32>* @C, align 4
+  ret void
+}
+; CHECK: define void @vec_store()
+; CHECK: store <4 x i32> <i32 0, i32 1, i32 2, i32 3>, <4 x i32>* @C, align 4
-- 
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