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Fix a gross typo: ARMv6+ may or may not support unaligned memory operations.

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Even if they are suported by the core, they can be disabled
(this is just a configuration bit inside some register).

Allow unaligned memops on darwin and conservatively disallow them otherwise.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94889 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2010-01-30 14:08:12 +00:00
parent 49db68fba0
commit 90cfc130d6
2 changed files with 6 additions and 6 deletions
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7
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -3854,8 +3854,11 @@ bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
if (!Subtarget->hasV6Ops())
// Pre-v6 does not support unaligned mem access.
return false;
else if (!Subtarget->hasV6Ops()) {
// v6 may or may not support unaligned mem access.
else {
// v6+ may or may not support unaligned mem access depending on the system
// configuration.
// FIXME: This is pretty conservative. Should we provide cmdline option to
// control the behaviour?
if (!Subtarget->isTargetDarwin())
return false;
}

5
test/CodeGen/ARM/unaligned_load_store.ll
View File

@ -1,6 +1,6 @@
; RUN: llc < %s -march=arm | FileCheck %s -check-prefix=GENERIC
; RUN: llc < %s -mtriple=armv6-apple-darwin | FileCheck %s -check-prefix=DARWIN_V6
; RUN: llc < %s -march=arm -mattr=+v7a | FileCheck %s -check-prefix=V7
; RUN: llc < %s -mtriple=armv6-linux | FileCheck %s -check-prefix=GENERIC
; rdar://7113725
@ -20,9 +20,6 @@ entry:
; DARWIN_V6: ldr r1
; DARWIN_V6: str r1
; V7: t:
; V7: ldr r1
; V7: str r1
%__src1.i = bitcast i8* %b to i32* ; <i32*> [#uses=1]
%__dest2.i = bitcast i8* %a to i32* ; <i32*> [#uses=1]
%tmp.i = load i32* %__src1.i, align 1 ; <i32> [#uses=1]