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Add support for the 'alignstack' attribute to the x86 backend. Fixes PR5254.

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Also, FileCheck'ize a test.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96686 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Charles Davis 2010-02-19 18:17:13 +00:00
parent 00cb5b7245
commit 5dfa26795d
3 changed files with 24 additions and 2 deletions
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3
lib/CodeGen/MachineFunction.cpp
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@ -95,6 +95,9 @@ MachineFunction::MachineFunction(Function *F, const TargetMachine &TM,
MFInfo = 0;
FrameInfo = new (Allocator.Allocate<MachineFrameInfo>())
MachineFrameInfo(*TM.getFrameInfo());
if (Fn->hasFnAttr(Attribute::StackAlignment))
FrameInfo->setMaxAlignment(Attribute::getStackAlignmentFromAttrs(
Fn->getAttributes().getFnAttributes()));
ConstantPool = new (Allocator.Allocate<MachineConstantPool>())
MachineConstantPool(TM.getTargetData());
Alignment = TM.getTargetLowering()->getFunctionAlignment(F);

4
lib/Target/X86/X86RegisterInfo.cpp
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@ -446,8 +446,10 @@ bool X86RegisterInfo::canRealignStack(const MachineFunction &MF) const {
bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
const Function *F = MF.getFunction();
bool requiresRealignment =
RealignStack && (MFI->getMaxAlignment() > StackAlign);
RealignStack && ((MFI->getMaxAlignment() > StackAlign) ||
F->hasFnAttr(Attribute::StackAlignment));
// FIXME: Currently we don't support stack realignment for functions with
// variable-sized allocas.

19
test/CodeGen/X86/stack-align.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -relocation-model=static -mcpu=yonah | grep {andpd.*4(%esp), %xmm}
; RUN: llc < %s -relocation-model=static -realign-stack=1 -mcpu=yonah | FileCheck %s
; The double argument is at 4(esp) which is 16-byte aligned, allowing us to
; fold the load into the andpd.
@ -12,6 +12,7 @@ entry:
%tmp = getelementptr { double, double }* %z, i32 0, i32 0 ; <double*> [#uses=1]
%tmp1 = load double* %tmp, align 8 ; <double> [#uses=1]
%tmp2 = tail call double @fabs( double %tmp1 ) ; <double> [#uses=1]
; CHECK: andpd{{.*}}4(%esp), %xmm
%tmp3 = load double* @G, align 16 ; <double> [#uses=1]
%tmp4 = tail call double @fabs( double %tmp3 ) ; <double> [#uses=1]
%tmp6 = fadd double %tmp4, %tmp2 ; <double> [#uses=1]
@ -19,4 +20,20 @@ entry:
ret void
}
define void @test2() alignstack(16) {
entry:
; CHECK: andl{{.*}}$-16, %esp
ret void
}
; Use a call to force a spill.
define <2 x double> @test3(<2 x double> %x, <2 x double> %y) alignstack(32) {
entry:
; CHECK: andl{{.*}}$-32, %esp
call void @test2()
%A = mul <2 x double> %x, %y
ret <2 x double> %A
}
declare double @fabs(double)