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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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19
test/CodeGen/X86/stack-align.ll
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@@ -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)