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Enable basepointer for AIX.

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Differential Revision: https://reviews.llvm.org/D82030
This commit is contained in:
Sean Fertile 2020-07-03 11:55:49 -04:00
parent cf6a1dd45a
commit 91c9c2c9c7
2 changed files with 48 additions and 6 deletions
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12
lib/Target/PowerPC/PPCFrameLowering.cpp
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@ -73,10 +73,12 @@ static unsigned computeLinkageSize(const PPCSubtarget &STI) {
}
static unsigned computeBasePointerSaveOffset(const PPCSubtarget &STI) {
// SVR4 ABI: First slot in the general register save area.
return STI.isPPC64()
? -16U
: STI.getTargetMachine().isPositionIndependent() ? -12U : -8U;
// Third slot in the general purpose register save area.
if (STI.is32BitELFABI() && STI.getTargetMachine().isPositionIndependent())
return -12U;
// Second slot in the general purpose register save area.
return STI.isPPC64() ? -16U : -8U;
}
static unsigned computeCRSaveOffset(const PPCSubtarget &STI) {
@ -2419,8 +2421,6 @@ unsigned PPCFrameLowering::getFramePointerSaveOffset() const {
}
unsigned PPCFrameLowering::getBasePointerSaveOffset() const {
if (Subtarget.isAIXABI())
report_fatal_error("BasePointer is not implemented on AIX yet.");
return BasePointerSaveOffset;
}

42
test/CodeGen/PowerPC/aix-base-pointer.ll Normal file
View File

@ -0,0 +1,42 @@
; RUN: llc -mcpu=pwr7 -mattr=-altivec -verify-machineinstrs \
; RUN: -mtriple=powerpc-unknown-aix < %s | FileCheck %s --check-prefix 32BIT
; RUN: llc -mcpu=pwr7 -mattr=-altivec -verify-machineinstrs \
; RUN: -mtriple=powerpc64-unknown-aix < %s | FileCheck %s --check-prefix 64BIT
; Use an overaligned buffer to force base-pointer usage. Test verifies:
; - base pointer register (r30) is saved/defined/restored.
; - stack frame is allocated with correct alignment.
; - Address of %AlignedBuffer is calculated based off offset from the stack
; pointer.
define void @caller() {
%AlignedBuffer = alloca [32 x i32], align 32
%Pointer = getelementptr inbounds [32 x i32], [32 x i32]* %AlignedBuffer, i64 0, i64 0
call void @callee(i32* %Pointer)
ret void
}
declare void @callee(i32*)
; 32BIT-LABEL: .caller:
; 32BIT: stw 30, -8(1)
; 32BIT: mr 30, 1
; 32BIT: clrlwi 0, 1, 27
; 32BIT: subfic 0, 0, -224
; 32BIT: stwux 1, 1, 0
; 32BIT: addi 3, 1, 64
; 32BIT: bl .callee
; 32BIT: lwz 1, 0(1)
; 32BIT: lwz 30, -8(1)
; 64BIT-LABEL: .caller:
; 64BIT: std 30, -16(1)
; 64BIT: mr 30, 1
; 64BIT: clrldi 0, 1, 59
; 64BIT: subfic 0, 0, -288
; 64BIT: stdux 1, 1, 0
; 64BIT: addi 3, 1, 128
; 64BIT: bl .callee
; 64BIT: ld 1, 0(1)
; 64BIT: ld 30, -16(1)