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[arm fast-isel] Make the fast-isel implementation of memcpy respect alignment.

Browse Source 
rdar://12821569

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169460 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2012-12-06 01:34:31 +00:00
parent 8a7186dbc2
commit c9758b1366
2 changed files with 116 additions and 14 deletions
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33
lib/Target/ARM/ARMFastISel.cpp
View File

@ -186,7 +186,8 @@ class ARMFastISel : public FastISel {
bool ARMComputeAddress(const Value *Obj, Address &Addr);
void ARMSimplifyAddress(Address &Addr, EVT VT, bool useAM3);
bool ARMIsMemCpySmall(uint64_t Len);
bool ARMTryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len);
bool ARMTryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len,
unsigned Alignment);
unsigned ARMEmitIntExt(EVT SrcVT, unsigned SrcReg, EVT DestVT, bool isZExt);
unsigned ARMMaterializeFP(const ConstantFP *CFP, EVT VT);
unsigned ARMMaterializeInt(const Constant *C, EVT VT);
@ -2422,21 +2423,30 @@ bool ARMFastISel::ARMIsMemCpySmall(uint64_t Len) {
}
bool ARMFastISel::ARMTryEmitSmallMemCpy(Address Dest, Address Src,
uint64_t Len) {
uint64_t Len, unsigned Alignment) {
// Make sure we don't bloat code by inlining very large memcpy's.
if (!ARMIsMemCpySmall(Len))
return false;
// We don't care about alignment here since we just emit integer accesses.
while (Len) {
MVT VT;
if (Len >= 4)
VT = MVT::i32;
else if (Len >= 2)
VT = MVT::i16;
else {
assert(Len == 1);
VT = MVT::i8;
if (!Alignment || Alignment >= 4) {
if (Len >= 4)
VT = MVT::i32;
else if (Len >= 2)
VT = MVT::i16;
else {
assert (Len == 1 && "Expected a length of 1!");
VT = MVT::i8;
}
} else {
// Bound based on alignment.
if (Len >= 2 && Alignment == 2)
VT = MVT::i16;
else {
assert (Alignment == 1 && "Expected an alignment of 1!");
VT = MVT::i8;
}
}
bool RV;
@ -2515,7 +2525,8 @@ bool ARMFastISel::SelectIntrinsicCall(const IntrinsicInst &I) {
if (!ARMComputeAddress(MTI.getRawDest(), Dest) ||
!ARMComputeAddress(MTI.getRawSource(), Src))
return false;
if (ARMTryEmitSmallMemCpy(Dest, Src, Len))
unsigned Alignment = MTI.getAlignment();
if (ARMTryEmitSmallMemCpy(Dest, Src, Len, Alignment))
return true;
}
}

97
test/CodeGen/ARM/fast-isel-intrinsic.ll
View File

@ -35,7 +35,7 @@ define void @t1() nounwind ssp {
; THUMB-LONG: movt r3, :upper16:L_memset$non_lazy_ptr
; THUMB-LONG: ldr r3, [r3]
; THUMB-LONG: blx r3
call void @llvm.memset.p0i8.i32(i8* getelementptr inbounds ([60 x i8]* @message1, i32 0, i32 5), i8 64, i32 10, i32 1, i1 false)
call void @llvm.memset.p0i8.i32(i8* getelementptr inbounds ([60 x i8]* @message1, i32 0, i32 5), i8 64, i32 10, i32 4, i1 false)
ret void
}
@ -73,7 +73,7 @@ define void @t2() nounwind ssp {
; THUMB-LONG: movt r3, :upper16:L_memcpy$non_lazy_ptr
; THUMB-LONG: ldr r3, [r3]
; THUMB-LONG: blx r3
call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 4), i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 16), i32 17, i32 1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 4), i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 16), i32 17, i32 4, i1 false)
ret void
}
@ -125,6 +125,7 @@ define void @t4() nounwind ssp {
; ARM: ldrh r1, [r0, #24]
; ARM: strh r1, [r0, #12]
; ARM: bx lr
; THUMB: t4
; THUMB: movw r0, :lower16:L_temp$non_lazy_ptr
; THUMB: movt r0, :upper16:L_temp$non_lazy_ptr
; THUMB: ldr r0, [r0]
@ -135,8 +136,98 @@ define void @t4() nounwind ssp {
; THUMB: ldrh r1, [r0, #24]
; THUMB: strh r1, [r0, #12]
; THUMB: bx lr
call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 4), i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 16), i32 10, i32 1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 4), i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 16), i32 10, i32 4, i1 false)
ret void
}
declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
define void @t5() nounwind ssp {
; ARM: t5
; ARM: movw r0, :lower16:L_temp$non_lazy_ptr
; ARM: movt r0, :upper16:L_temp$non_lazy_ptr
; ARM: ldr r0, [r0]
; ARM: ldrh r1, [r0, #16]
; ARM: strh r1, [r0, #4]
; ARM: ldrh r1, [r0, #18]
; ARM: strh r1, [r0, #6]
; ARM: ldrh r1, [r0, #20]
; ARM: strh r1, [r0, #8]
; ARM: ldrh r1, [r0, #22]
; ARM: strh r1, [r0, #10]
; ARM: ldrh r1, [r0, #24]
; ARM: strh r1, [r0, #12]
; ARM: bx lr
; THUMB: t5
; THUMB: movw r0, :lower16:L_temp$non_lazy_ptr
; THUMB: movt r0, :upper16:L_temp$non_lazy_ptr
; THUMB: ldr r0, [r0]
; THUMB: ldrh r1, [r0, #16]
; THUMB: strh r1, [r0, #4]
; THUMB: ldrh r1, [r0, #18]
; THUMB: strh r1, [r0, #6]
; THUMB: ldrh r1, [r0, #20]
; THUMB: strh r1, [r0, #8]
; THUMB: ldrh r1, [r0, #22]
; THUMB: strh r1, [r0, #10]
; THUMB: ldrh r1, [r0, #24]
; THUMB: strh r1, [r0, #12]
; THUMB: bx lr
call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 4), i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 16), i32 10, i32 2, i1 false)
ret void
}
define void @t6() nounwind ssp {
; ARM: t6
; ARM: movw r0, :lower16:L_temp$non_lazy_ptr
; ARM: movt r0, :upper16:L_temp$non_lazy_ptr
; ARM: ldr r0, [r0]
; ARM: ldrb r1, [r0, #16]
; ARM: strb r1, [r0, #4]
; ARM: ldrb r1, [r0, #17]
; ARM: strb r1, [r0, #5]
; ARM: ldrb r1, [r0, #18]
; ARM: strb r1, [r0, #6]
; ARM: ldrb r1, [r0, #19]
; ARM: strb r1, [r0, #7]
; ARM: ldrb r1, [r0, #20]
; ARM: strb r1, [r0, #8]
; ARM: ldrb r1, [r0, #21]
; ARM: strb r1, [r0, #9]
; ARM: ldrb r1, [r0, #22]
; ARM: strb r1, [r0, #10]
; ARM: ldrb r1, [r0, #23]
; ARM: strb r1, [r0, #11]
; ARM: ldrb r1, [r0, #24]
; ARM: strb r1, [r0, #12]
; ARM: ldrb r1, [r0, #25]
; ARM: strb r1, [r0, #13]
; ARM: bx lr
; THUMB: t6
; THUMB: movw r0, :lower16:L_temp$non_lazy_ptr
; THUMB: movt r0, :upper16:L_temp$non_lazy_ptr
; THUMB: ldr r0, [r0]
; THUMB: ldrb r1, [r0, #16]
; THUMB: strb r1, [r0, #4]
; THUMB: ldrb r1, [r0, #17]
; THUMB: strb r1, [r0, #5]
; THUMB: ldrb r1, [r0, #18]
; THUMB: strb r1, [r0, #6]
; THUMB: ldrb r1, [r0, #19]
; THUMB: strb r1, [r0, #7]
; THUMB: ldrb r1, [r0, #20]
; THUMB: strb r1, [r0, #8]
; THUMB: ldrb r1, [r0, #21]
; THUMB: strb r1, [r0, #9]
; THUMB: ldrb r1, [r0, #22]
; THUMB: strb r1, [r0, #10]
; THUMB: ldrb r1, [r0, #23]
; THUMB: strb r1, [r0, #11]
; THUMB: ldrb r1, [r0, #24]
; THUMB: strb r1, [r0, #12]
; THUMB: ldrb r1, [r0, #25]
; THUMB: strb r1, [r0, #13]
; THUMB: bx lr
call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 4), i8* getelementptr inbounds ([60 x i8]* @temp, i32 0, i32 16), i32 10, i32 1, i1 false)
ret void
}