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https://github.com/RPCS3/llvm-mirror.git
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3add36fb90
Third time's the charm? The previous attempt (r265345) caused ASan test failures on X86, as broken CFI caused stack traces to not work. This version of the patch makes sure not to merge with stack adjustments that have CFI, and to not add merged instructions' offests to the CFI about to be generated. This is already covered by the lit tests; I just got the expectations wrong previously. llvm-svn: 265623
77 lines
2.3 KiB
LLVM
77 lines
2.3 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 -mcpu=generic -stackrealign -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, 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-LABEL: g:
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; CHECK: pushl %ebp
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; CHECK-NEXT: movl %esp, %ebp
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; CHECK-NEXT: pushl
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; CHECK-NEXT: pushl
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; CHECK-NEXT: andl $-32, %esp
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; CHECK-NEXT: subl $32, %esp
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;
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; Now setup the base pointer (%esi).
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; CHECK-NEXT: movl %esp, %esi
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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.
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; CHECK: subl $20, %esp
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; CHECK-NOT: {{[^ ,]*}}, %esp
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; CHECK: pushl
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; CHECK: pushl
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; CHECK: pushl
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; CHECK: calll memset
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;
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; Deallocating 32 bytes of outgoing call frame for memset and
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; allocating 28 bytes for calling f yields a 4-byte adjustment:
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; CHECK-NEXT: addl $4, %esp
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; CHECK-NOT: {{[^ ,]*}}, %esp
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;
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; And move on to call 'f', and then restore the stack.
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; CHECK: pushl
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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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; Restore %esp from %ebp (frame pointer) and subtract the size of
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; zone with callee-saved registers to pop them.
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; This is the state prior to stack realignment and the allocation of VLAs.
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; CHECK-NOT: popl
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; CHECK: leal -8(%ebp), %esp
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; CHECK-NEXT: popl
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; CHECK-NEXT: popl
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; CHECK-NEXT: popl %ebp
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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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