41f430a48d
Doing so can cause the resulting displacement after frame layout to become inexpressible (or cause over/underflow currently during frame layout). Fixes the error reported in https://github.com/llvm/llvm-project/pull/101840#issuecomment-2306975944.
48 lines
1.6 KiB
LLVM
48 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc < %s -mtriple=i386 --frame-pointer=all | FileCheck %s
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; ISel will try to fold pointer arithmetic into the address displacement. However, we don't
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; want to do that if the offset is very close to the expressible limit because the final frame
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; layout may push it over/under the limit.
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define i32 @foo(i1 %b) #0 {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushl %ebp
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: .cfi_offset %ebp, -8
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; CHECK-NEXT: movl %esp, %ebp
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; CHECK-NEXT: .cfi_def_cfa_register %ebp
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; CHECK-NEXT: subl $8, %esp
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; CHECK-NEXT: movl __stack_chk_guard, %eax
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; CHECK-NEXT: movl %eax, -4(%ebp)
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; CHECK-NEXT: testb $1, 8(%ebp)
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; CHECK-NEXT: jne .LBB0_1
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; CHECK-NEXT: # %bb.2: # %entry
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: jmp .LBB0_3
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; CHECK-NEXT: .LBB0_1:
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; CHECK-NEXT: movl $-2147483647, %eax # imm = 0x80000001
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; CHECK-NEXT: leal -5(%ebp,%eax), %eax
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; CHECK-NEXT: .LBB0_3: # %entry
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; CHECK-NEXT: movl __stack_chk_guard, %ecx
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; CHECK-NEXT: cmpl -4(%ebp), %ecx
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; CHECK-NEXT: jne .LBB0_5
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; CHECK-NEXT: # %bb.4: # %entry
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; CHECK-NEXT: addl $8, %esp
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; CHECK-NEXT: popl %ebp
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; CHECK-NEXT: .cfi_def_cfa %esp, 4
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; CHECK-NEXT: retl
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; CHECK-NEXT: .LBB0_5: # %entry
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; CHECK-NEXT: .cfi_def_cfa %ebp, 8
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; CHECK-NEXT: calll __stack_chk_fail
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entry:
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%a = alloca i8, align 1
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%0 = ptrtoint ptr %a to i32
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%sub = add i32 %0, -2147483647
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%retval.0 = select i1 %b, i32 %sub, i32 0
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ret i32 %retval.0
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}
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attributes #0 = { sspreq }
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