llvm/test/CodeGen/X86/stack-align.ll
Bill Wendling 61fc8d670f Use function attributes to indicate that we don't want to realign the stack.
Function attributes are the future! So just query whether we want to realign the
stack directly from the function instead of through a random target options
structure.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187618 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-01 21:42:05 +00:00

52 lines
1.7 KiB
LLVM

; RUN: llc < %s -relocation-model=static -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.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-apple-darwin8"
@G = external global double
define void @test({ double, double }* byval %z, double* %P) nounwind {
entry:
%tmp3 = load double* @G, align 16 ; <double> [#uses=1]
%tmp4 = tail call double @fabs( double %tmp3 ) readnone ; <double> [#uses=1]
store volatile double %tmp4, double* %P
%tmp = getelementptr { double, double }* %z, i32 0, i32 0 ; <double*> [#uses=1]
%tmp1 = load volatile double* %tmp, align 8 ; <double> [#uses=1]
%tmp2 = tail call double @fabs( double %tmp1 ) readnone ; <double> [#uses=1]
; CHECK: andpd{{.*}}4(%esp), %xmm
%tmp6 = fadd double %tmp4, %tmp2 ; <double> [#uses=1]
store volatile double %tmp6, double* %P, align 8
ret void
}
define void @test2() alignstack(16) nounwind {
entry:
; CHECK: andl{{.*}}$-16, %esp
ret void
}
; Use a call to force a spill.
define <2 x double> @test3(<2 x double> %x, <2 x double> %y) alignstack(32) nounwind {
entry:
; CHECK: andl{{.*}}$-32, %esp
call void @test2()
%A = fmul <2 x double> %x, %y
ret <2 x double> %A
}
declare double @fabs(double)
; The pointer is already known aligned, so and x,-16 is eliminable.
define i32 @test4() nounwind {
entry:
%buffer = alloca [2048 x i8], align 16
%0 = ptrtoint [2048 x i8]* %buffer to i32
%and = and i32 %0, -16
ret i32 %and
; CHECK-LABEL: test4:
; CHECK-NOT: and
; CHECK: ret
}