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[arm-fast-isel] Add support for the llvm.frameaddress() intrinsic. 

Patch by Jush Lu <jush.msn@gmail.com>.

llvm-svn: 157696
This commit is contained in:
Chad Rosier 2012-05-30 17:23:22 +00:00
parent 161c648135
commit 820d248c4d
2 changed files with 136 additions and 0 deletions
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36
llvm/lib/Target/ARM/ARMFastISel.cpp
View File

@ -2406,6 +2406,42 @@ bool ARMFastISel::SelectIntrinsicCall(const IntrinsicInst &I) {
// FIXME: Handle more intrinsics.
switch (I.getIntrinsicID()) {
default: return false;
case Intrinsic::frameaddress: {
MachineFrameInfo *MFI = FuncInfo.MF->getFrameInfo();
MFI->setFrameAddressIsTaken(true);
unsigned LdrOpc;
const TargetRegisterClass *RC;
if (isThumb2) {
LdrOpc = ARM::t2LDRi12;
RC = (const TargetRegisterClass*)&ARM::tGPRRegClass;
} else {
LdrOpc = ARM::LDRi12;
RC = (const TargetRegisterClass*)&ARM::GPRRegClass;
}
const ARMBaseRegisterInfo *RegInfo =
static_cast<const ARMBaseRegisterInfo*>(TM.getRegisterInfo());
unsigned FramePtr = RegInfo->getFrameRegister(*(FuncInfo.MF));
unsigned SrcReg = FramePtr;
// Recursively load frame address
// ldr r0 [fp]
// ldr r0 [r0]
// ldr r0 [r0]
// ...
unsigned DestReg;
unsigned Depth = cast<ConstantInt>(I.getOperand(0))->getZExtValue();
while (Depth--) {
DestReg = createResultReg(RC);
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(LdrOpc), DestReg)
.addReg(SrcReg).addImm(0));
SrcReg = DestReg;
}
UpdateValueMap(&I, DestReg);
return true;
}
case Intrinsic::memcpy:
case Intrinsic::memmove: {
const MemTransferInst &MTI = cast<MemTransferInst>(I);

100
llvm/test/CodeGen/ARM/fast-isel-frameaddr.ll Normal file
View File

@ -0,0 +1,100 @@
; RUN: llc < %s -O0 -fast-isel-abort -mtriple=armv7-apple-darwin | FileCheck %s --check-prefix=DARWIN-ARM
; RUN: llc < %s -O0 -fast-isel-abort -mtriple=armv7-linux-gnueabi | FileCheck %s --check-prefix=LINUX-ARM
; RUN: llc < %s -O0 -fast-isel-abort -mtriple=thumbv7-apple-darwin | FileCheck %s --check-prefix=DARWIN-THUMB2
; RUN: llc < %s -O0 -fast-isel-abort -mtriple=thumbv7-linux-gnueabi | FileCheck %s --check-prefix=LINUX-THUMB2
define i8* @frameaddr_index0() nounwind {
entry:
; DARWIN-ARM: frameaddr_index0:
; DARWIN-ARM: push {r7}
; DARWIN-ARM: mov r7, sp
; DARWIN-ARM: mov r0, r7
; DARWIN-THUMB2: frameaddr_index0:
; DARWIN-THUMB2: str r7, [sp, #-4]!
; DARWIN-THUMB2: mov r7, sp
; DARWIN-THUMB2: mov r0, r7
; LINUX-ARM: frameaddr_index0:
; LINUX-ARM: push {r11}
; LINUX-ARM: mov r11, sp
; LINUX-ARM: mov r0, r11
; LINUX-THUMB2: frameaddr_index0:
; LINUX-THUMB2: str r7, [sp, #-4]!
; LINUX-THUMB2: mov r7, sp
; LINUX-THUMB2: mov r0, r7
%0 = call i8* @llvm.frameaddress(i32 0)
ret i8* %0
}
define i8* @frameaddr_index1() nounwind {
entry:
; DARWIN-ARM: frameaddr_index1:
; DARWIN-ARM: push {r7}
; DARWIN-ARM: mov r7, sp
; DARWIN-ARM: mov r0, r7
; DARWIN-ARM: ldr r0, [r0]
; DARWIN-THUMB2: frameaddr_index1:
; DARWIN-THUMB2: str r7, [sp, #-4]!
; DARWIN-THUMB2: mov r7, sp
; DARWIN-THUMB2: mov r0, r7
; DARWIN-THUMB2: ldr r0, [r0]
; LINUX-ARM: frameaddr_index1:
; LINUX-ARM: push {r11}
; LINUX-ARM: mov r11, sp
; LINUX-ARM: mov r0, r11
; LINUX-ARM: ldr r0, [r0]
; LINUX-THUMB2: frameaddr_index1:
; LINUX-THUMB2: str r7, [sp, #-4]!
; LINUX-THUMB2: mov r7, sp
; LINUX-THUMB2: mov r0, r7
; LINUX-THUMB2: ldr r0, [r0]
%0 = call i8* @llvm.frameaddress(i32 1)
ret i8* %0
}
define i8* @frameaddr_index3() nounwind {
entry:
; DARWIN-ARM: frameaddr_index3:
; DARWIN-ARM: push {r7}
; DARWIN-ARM: mov r7, sp
; DARWIN-ARM: mov r0, r7
; DARWIN-ARM: ldr r0, [r0]
; DARWIN-ARM: ldr r0, [r0]
; DARWIN-ARM: ldr r0, [r0]
; DARWIN-THUMB2: frameaddr_index3:
; DARWIN-THUMB2: str r7, [sp, #-4]!
; DARWIN-THUMB2: mov r7, sp
; DARWIN-THUMB2: mov r0, r7
; DARWIN-THUMB2: ldr r0, [r0]
; DARWIN-THUMB2: ldr r0, [r0]
; DARWIN-THUMB2: ldr r0, [r0]
; LINUX-ARM: frameaddr_index3:
; LINUX-ARM: push {r11}
; LINUX-ARM: mov r11, sp
; LINUX-ARM: mov r0, r11
; LINUX-ARM: ldr r0, [r0]
; LINUX-ARM: ldr r0, [r0]
; LINUX-ARM: ldr r0, [r0]
; LINUX-THUMB2: frameaddr_index3:
; LINUX-THUMB2: str r7, [sp, #-4]!
; LINUX-THUMB2: mov r7, sp
; LINUX-THUMB2: mov r0, r7
; LINUX-THUMB2: ldr r0, [r0]
; LINUX-THUMB2: ldr r0, [r0]
; LINUX-THUMB2: ldr r0, [r0]
%0 = call i8* @llvm.frameaddress(i32 3)
ret i8* %0
}
declare i8* @llvm.frameaddress(i32) nounwind readnone