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82cb0e3bb0
Summary: Relate bug: https://bugs.llvm.org/show_bug.cgi?id=37472 The shrink wrapping pass prematurally restores the stack, at a point where the stack might still be accessed. Taking an exception can cause the stack to be corrupted. As a first approach, this patch is overly conservative, assuming that any instruction that may load or store could access the stack. Reviewers: dmgreen, qcolombet Reviewed By: qcolombet Subscribers: simpal01, efriedma, eli.friedman, javed.absar, llvm-commits, eugenis, chill, carwil, thegameg Tags: #llvm Differential Revision: https://reviews.llvm.org/D63152 llvm-svn: 363265
53 lines
1.8 KiB
LLVM
53 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=x86_64-windows-gnu -exception-model=dwarf < %s | FileCheck %s
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%struct.A = type { [4096 x i8] }
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@a = common global i32 0, align 4
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@b = common global i32 0, align 4
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define void @fn1() nounwind uwtable {
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; CHECK-LABEL: fn1:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: movl $4136, %eax # imm = 0x1028
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; CHECK-NEXT: callq ___chkstk_ms
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; CHECK-NEXT: subq %rax, %rsp
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; CHECK-NEXT: .cfi_def_cfa_offset 4144
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; CHECK-NEXT: movl {{.*}}(%rip), %eax
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; CHECK-NEXT: testl %eax, %eax
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; CHECK-NEXT: jne .LBB0_2
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; CHECK-NEXT: # %bb.1: # %select.true.sink
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; CHECK-NEXT: cltq
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; CHECK-NEXT: imulq $715827883, %rax, %rax # imm = 0x2AAAAAAB
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; CHECK-NEXT: movq %rax, %rcx
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; CHECK-NEXT: shrq $63, %rcx
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; CHECK-NEXT: shrq $32, %rax
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; CHECK-NEXT: addl %ecx, %eax
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; CHECK-NEXT: .LBB0_2: # %select.end
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; CHECK-NEXT: movl %eax, {{.*}}(%rip)
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; CHECK-NEXT: leaq {{[0-9]+}}(%rsp), %rcx
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; CHECK-NEXT: # kill: def $ecx killed $ecx killed $rcx
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; CHECK-NEXT: callq fn2
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; CHECK-NEXT: addq $4136, %rsp # imm = 0x1028
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; CHECK-NEXT: retq
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entry:
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%ctx = alloca %struct.A, align 1
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%0 = load i32, i32* @a, align 4
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%tobool = icmp eq i32 %0, 0
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%div = sdiv i32 %0, 6
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%cond = select i1 %tobool, i32 %div, i32 %0
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store i32 %cond, i32* @b, align 4
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%1 = getelementptr inbounds %struct.A, %struct.A* %ctx, i64 0, i32 0, i64 0
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call void @llvm.lifetime.start.p0i8(i64 4096, i8* nonnull %1)
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%2 = ptrtoint %struct.A* %ctx to i64
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%3 = trunc i64 %2 to i32
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call void @fn2(i32 %3)
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call void @llvm.lifetime.end.p0i8(i64 4096, i8* nonnull %1)
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ret void
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}
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declare void @fn2(i32)
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
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