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SPARC v9 stack pointer bias. 

64-bit SPARC v9 processes use biased stack and frame pointers, so the
current function's stack frame is located at %sp+BIAS .. %fp+BIAS where
BIAS = 2047.

This makes more local variables directly accessible via [%fp+simm13]
addressing.

llvm-svn: 178965
This commit is contained in:
Jakob Stoklund Olesen 2013-04-06 21:38:57 +00:00
parent 63742f1379
commit 03d9f7fda6
3 changed files with 14 additions and 9 deletions
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5
llvm/lib/Target/Sparc/SparcRegisterInfo.cpp
View File

@ -74,8 +74,9 @@ SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// Addressable stack objects are accessed using neg. offsets from %fp
MachineFunction &MF = *MI.getParent()->getParent();
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
MI.getOperand(FIOperandNum + 1).getImm();
int64_t Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
MI.getOperand(FIOperandNum + 1).getImm() +
Subtarget.getStackPointerBias();
// Replace frame index with a frame pointer reference.
if (Offset >= -4096 && Offset <= 4095) {

6
llvm/lib/Target/Sparc/SparcSubtarget.h
View File

@ -52,6 +52,12 @@ public:
}
return std::string(p);
}
/// The 64-bit ABI uses biased stack and frame pointers, so the stack frame
/// of the current function is the area from [%sp+BIAS] to [%fp+BIAS].
int64_t getStackPointerBias() const {
return is64Bit() ? 2047 : 0;
}
};
} // end namespace llvm

12
llvm/test/CodeGen/SPARC/64abi.ll
View File

@ -7,10 +7,9 @@
; CHECK: st %i3, [%i4]
; CHECK: stx %i4, [%i4]
; CHECK: st %i5, [%i4]
; FIXME: Stack bias
; CHECK: ld [%fp+180], [[R:%[gilo][0-7]]]
; CHECK: ld [%fp+2227], [[R:%[gilo][0-7]]]
; CHECK: st [[R]], [%i4]
; CHECK: ldx [%fp+184], [[R:%[gilo][0-7]]]
; CHECK: ldx [%fp+2231], [[R:%[gilo][0-7]]]
; CHECK: stx [[R]], [%i4]
define void @intarg(i8 %a0, ; %i0
i8 %a1, ; %i1
@ -39,8 +38,7 @@ define void @intarg(i8 %a0, ; %i0
; CHECK: faddd %f2,
; CHECK: faddd %f4,
; CHECK: faddd %f6,
; FIXME: Stack bias
; CHECK: ld [%fp+260], [[F:%f[0-9]+]]
; CHECK: ld [%fp+2307], [[F:%f[0-9]+]]
; CHECK: fadds %f31, [[F]]
define double @floatarg(float %a0, ; %f1
double %a1, ; %d2
@ -74,8 +72,8 @@ define double @floatarg(float %a0, ; %f1
; CHECK: fstod %f3
; CHECK: faddd %f6
; CHECK: faddd %f16
; CHECK: ldx [%fp+184]
; CHECK: ldx [%fp+200]
; CHECK: ldx [%fp+2231]
; CHECK: ldx [%fp+2247]
define void @mixedarg(i8 %a0, ; %i0
float %a1, ; %f3
i16 %a2, ; %i2