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Align SP adjustment in function getSPAdjust

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This commit adds a new function TargetFrameLowering::alignSPAdjust
and calls it from TargetInstrInfo::getSPAdjust. It fixes PR24142.

llvm-svn: 245253
This commit is contained in:
Guozhi Wei 2015-08-17 22:36:27 +00:00
parent f4259c25a8
commit 82b60bf3e7
4 changed files with 61 additions and 2 deletions
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12
include/llvm/Target/TargetFrameLowering.h
View File

@ -70,6 +70,18 @@ public:
///
unsigned getStackAlignment() const { return StackAlignment; }
/// alignSPAdjust - This method aligns the stack adjustment to the correct
/// alignment.
///
int alignSPAdjust(int SPAdj) const {
if (SPAdj < 0) {
SPAdj = -RoundUpToAlignment(-SPAdj, StackAlignment);
} else {
SPAdj = RoundUpToAlignment(SPAdj, StackAlignment);
}
return SPAdj;
}
/// getTransientStackAlignment - This method returns the number of bytes to
/// which the stack pointer must be aligned at all times, even between
/// calls.

1
lib/CodeGen/TargetInstrInfo.cpp
View File

@ -655,6 +655,7 @@ int TargetInstrInfo::getSPAdjust(const MachineInstr *MI) const {
return 0;
int SPAdj = MI->getOperand(0).getImm();
SPAdj = TFI->alignSPAdjust(SPAdj);
if ((!StackGrowsDown && MI->getOpcode() == FrameSetupOpcode) ||
(StackGrowsDown && MI->getOpcode() == FrameDestroyOpcode))

3
lib/Target/ARM/ARMFrameLowering.cpp
View File

@ -1734,8 +1734,7 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
// We need to keep the stack aligned properly. To do this, we round the
// amount of space needed for the outgoing arguments up to the next
// alignment boundary.
unsigned Align = getStackAlignment();
Amount = (Amount+Align-1)/Align*Align;
Amount = alignSPAdjust(Amount);
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
assert(!AFI->isThumb1OnlyFunction() &&

47
test/CodeGen/ARM/align-sp-adjustment.ll Normal file
View File

@ -0,0 +1,47 @@
; RUN: llc -mtriple=thumbv7 -o - %s | FileCheck %s
; CHECK: [sp, #2120]
%struct.struct_2 = type { [172 x %struct.struct_1] }
%struct.struct_1 = type { i32, i32, i32 }
@.str = private unnamed_addr constant [2 x i8] c"a\00", align 1
@.str.1 = private unnamed_addr constant [2 x i8] c"b\00", align 1
@.str.2 = private unnamed_addr constant [2 x i8] c"c\00", align 1
@.str.3 = private unnamed_addr constant [2 x i8] c"d\00", align 1
declare i32* @_Z4bar3iiPKcS0_i(i32, i32, i8*, i8*, i32)
declare void @_Z4bar1i8struct_2(i32, %struct.struct_2* byval align 4)
declare i32 @_Z4bar2PiPKc(i32*, i8*)
define void @_Z3fooiiiii(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5) #0 {
entry:
%params = alloca %struct.struct_2, align 4
%0 = bitcast %struct.struct_2* %params to i8*
br label %for.body
for.body:
%i.015 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
%call = tail call i32* @_Z4bar3iiPKcS0_i(i32 %p1, i32 %p5, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i32 0, i32 0), i32 %i.015) #4
%cmp1 = icmp eq i32* %call, null
br i1 %cmp1, label %cleanup.8, label %for.inc
for.inc:
%call2 = tail call i32 @_Z4bar2PiPKc(i32* %call, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i32 0, i32 0)) #4
%f1 = getelementptr inbounds %struct.struct_2, %struct.struct_2* %params, i32 0, i32 0, i32 %i.015, i32 0
store i32 %call2, i32* %f1, align 4
%call3 = tail call i32 @_Z4bar2PiPKc(i32* %call, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i32 0, i32 0)) #4
%f2 = getelementptr inbounds %struct.struct_2, %struct.struct_2* %params, i32 0, i32 0, i32 %i.015, i32 1
store i32 %call3, i32* %f2, align 4
%inc = add nuw nsw i32 %i.015, 1
%cmp = icmp slt i32 %inc, 4
br i1 %cmp, label %for.body, label %for.end
for.end:
call void @_Z4bar1i8struct_2(i32 %p4, %struct.struct_2* byval nonnull align 4 %params) #4
br label %cleanup.8
cleanup.8:
ret void
}