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[fast-isel] Fallback to SelectionDAG isel if we require strict alignment for 

non-halfword-aligned i16 loads/stores.
rdar://12304911

llvm-svn: 164345
This commit is contained in:
Chad Rosier 2012-09-21 00:41:42 +00:00
parent e2baa97d60
commit 2364f58326
2 changed files with 36 additions and 0 deletions
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6
llvm/lib/Target/ARM/ARMFastISel.cpp
View File

@ -1021,6 +1021,9 @@ bool ARMFastISel::ARMEmitLoad(EVT VT, unsigned &ResultReg, Address &Addr,
RC = &ARM::GPRRegClass;
break;
case MVT::i16:
if (Alignment && Alignment < 2 && !Subtarget->allowsUnalignedMem())
return false;
if (isThumb2) {
if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
Opc = isZExt ? ARM::t2LDRHi8 : ARM::t2LDRSHi8;
@ -1139,6 +1142,9 @@ bool ARMFastISel::ARMEmitStore(EVT VT, unsigned SrcReg, Address &Addr,
}
break;
case MVT::i16:
if (Alignment && Alignment < 2 && !Subtarget->allowsUnalignedMem())
return false;
if (isThumb2) {
if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
StrOpc = ARM::t2STRHi8;

30
llvm/test/CodeGen/ARM/fast-isel.ll
View File

@ -1,5 +1,7 @@
; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios | FileCheck %s --check-prefix=ARM
; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios | FileCheck %s --check-prefix=THUMB
; RUN: llc < %s -O0 -arm-strict-align -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios | FileCheck %s --check-prefix=ARM-STRICT-ALIGN
; RUN: llc < %s -O0 -arm-strict-align -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios | FileCheck %s --check-prefix=THUMB-STRICT-ALIGN
; Very basic fast-isel functionality.
define i32 @add(i32 %a, i32 %b) nounwind {
@ -238,3 +240,31 @@ entry:
}
declare void @llvm.trap() nounwind
define void @unaligned_i16_store(i16 %x, i16* %y) nounwind {
entry:
; ARM-STRICT-ALIGN: @unaligned_i16_store
; ARM-STRICT-ALIGN: strb
; ARM-STRICT-ALIGN-NEXT: strb
; THUMB-STRICT-ALIGN: @unaligned_i16_store
; THUMB-STRICT-ALIGN: strb
; THUMB-STRICT-ALIGN: strb
store i16 %x, i16* %y, align 1
ret void
}
define i16 @unaligned_i16_load(i16* %x) nounwind {
entry:
; ARM-STRICT-ALIGN: @unaligned_i16_store
; ARM-STRICT-ALIGN: ldrb
; ARM-STRICT-ALIGN: ldrb
; THUMB-STRICT-ALIGN: @unaligned_i16_store
; THUMB-STRICT-ALIGN: ldrb
; THUMB-STRICT-ALIGN: ldrb
%0 = load i16* %x, align 1
ret i16 %0
}