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1c3df655ea
temporarily reverted. This test is annoyingly overspecified, but I don't know of another way to thoroughly test the saving and restoring of the registers. While this will have to be adjusted even with the issue fixed in order to re-apply r158087, those adjustments should very clearly indicate that it is still correct (%esp getting restored prior to pops), whereas without it, this case can easily slip under the radar. Still, any suggestions for improvements are very welcome. All credit to Matt Beaumont-Gay for reducing this out of an insane Address Sanitizer crash to a reasonably small seg-faulting C program when built with -mstackrealign. I just reduced it to IR, which was much simpler. =] llvm-svn: 158656
64 lines
1.8 KiB
LLVM
64 lines
1.8 KiB
LLVM
; This test is attempting to detect when we request forced re-alignment of the
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; stack to an alignment greater than would be available due to the ABI. We
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; arbitrarily force alignment up to 32-bytes for i386 hoping that this will
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; exceed any ABI provisions.
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;
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; RUN: llc < %s -force-align-stack -stack-alignment=32 | FileCheck %s
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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-f80:32:32-n8:16:32-S128"
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target triple = "i386-unknown-linux-gnu"
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define i32 @f(i8* %p) nounwind {
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entry:
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%0 = load i8* %p
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%conv = sext i8 %0 to i32
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ret i32 %conv
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}
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define i64 @g(i32 %i) nounwind {
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; CHECK: g:
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; CHECK: pushl
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; CHECK-NEXT: movl %esp, %ebp
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; CHECK-NEXT: pushl
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; CHECK-NEXT: subl $20, %esp
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; CHECK-NOT: {{[^ ,]*}}, %esp
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;
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; The next adjustment of the stack is due to the alloca.
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; CHECK: movl %{{...}}, %esp
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; CHECK-NOT: {{[^ ,]*}}, %esp
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;
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; Next we set up the memset call, and then undo it.
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; CHECK: subl $32, %esp
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; CHECK-NOT: {{[^ ,]*}}, %esp
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; CHECK: calll memset
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; CHECK-NEXT: addl $32, %esp
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; CHECK-NOT: {{[^ ,]*}}, %esp
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;
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; Next we set up the call to 'f'.
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; CHECK: subl $32, %esp
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; CHECK-NOT: {{[^ ,]*}}, %esp
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; CHECK: calll f
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; CHECK-NEXT: addl $32, %esp
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; CHECK-NOT: {{[^ ,]*}}, %esp
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;
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; Finally we nede to restore %esp from %ebp, the alloca prevents us from
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; restoring it directly.
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; CHECK-NOT: popl
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; CHECK: leal -4(%ebp), %esp
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; CHECK-NEXT: popl
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; CHECK-NEXT: popl
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; CHECK-NEXT: ret
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entry:
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br label %if.then
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if.then:
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%0 = alloca i8, i32 %i
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call void @llvm.memset.p0i8.i32(i8* %0, i8 0, i32 %i, i32 1, i1 false)
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%call = call i32 @f(i8* %0)
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%conv = sext i32 %call to i64
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ret i64 %conv
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}
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declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i32, i1) nounwind
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