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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
51 lines
1.3 KiB
LLVM
51 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=aarch64-apple-darwin -aarch64-cbz-offset-bits=3 < %s | FileCheck %s
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define void @split_block_no_fallthrough(i64 %val) #0 {
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; CHECK-LABEL: split_block_no_fallthrough:
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; CHECK: ; %bb.0: ; %bb
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; CHECK-NEXT: stp x29, x30, [sp, #-16]! ; 16-byte Folded Spill
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; CHECK-NEXT: cmn x0, #5 ; =5
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; CHECK-NEXT: b.le LBB0_3
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; CHECK-NEXT: ; %bb.1: ; %b3
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; CHECK-NEXT: ldr w8, [x8]
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; CHECK-NEXT: cbnz w8, LBB0_2
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; CHECK-NEXT: b LBB0_4
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; CHECK-NEXT: LBB0_2: ; %b8
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; CHECK-NEXT: ldp x29, x30, [sp], #16 ; 16-byte Folded Reload
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; CHECK-NEXT: ret
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; CHECK-NEXT: LBB0_3: ; %b2
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; CHECK-NEXT: mov w0, #93
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; CHECK-NEXT: bl _extfunc
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; CHECK-NEXT: cbnz w0, LBB0_2
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; CHECK-NEXT: LBB0_4: ; %b7
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; CHECK-NEXT: mov w0, #13
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; CHECK-NEXT: ldp x29, x30, [sp], #16 ; 16-byte Folded Reload
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; CHECK-NEXT: b _extfunc
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bb:
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%c0 = icmp sgt i64 %val, -5
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br i1 %c0, label %b3, label %b2
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b2:
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%v0 = tail call i32 @extfunc(i32 93)
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%c1 = icmp eq i32 %v0, 0
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br i1 %c1, label %b7, label %b8
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b3:
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%v1 = load volatile i32, i32* undef, align 4
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%c2 = icmp eq i32 %v1, 0
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br i1 %c2, label %b7, label %b8
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b7:
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%tmp1 = tail call i32 @extfunc(i32 13)
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ret void
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b8:
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ret void
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}
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declare i32 @extfunc(i32) #0
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attributes #0 = { nounwind }
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