f2c6bfa350
As reported in https://github.com/rust-lang/rust/issues/70143 alignment is not taken into account when doing the probing. Fix that by adjusting the first probe if the stack align is small, or by extending the dynamic probing if the alignment is large. Differential Revision: https://reviews.llvm.org/D84419
84 lines
2.4 KiB
LLVM
84 lines
2.4 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @foo_noprotect() local_unnamed_addr {
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; CHECK-LABEL: foo_noprotect:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset %rbp, -16
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; CHECK-NEXT: movq %rsp, %rbp
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; CHECK-NEXT: .cfi_def_cfa_register %rbp
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; CHECK-NEXT: andq $-65536, %rsp
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; CHECK-NEXT: subq $65536, %rsp
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; CHECK-NEXT: movl $1, 392(%rsp)
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; CHECK-NEXT: movl (%rsp), %eax
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; CHECK-NEXT: movq %rbp, %rsp
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_def_cfa %rsp, 8
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; CHECK-NEXT: retq
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%a = alloca i32, i64 100, align 65536
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%b = getelementptr inbounds i32, i32* %a, i64 98
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store volatile i32 1, i32* %b
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%c = load volatile i32, i32* %a
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ret i32 %c
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}
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define i32 @foo_protect() local_unnamed_addr #0 {
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; CHECK-LABEL: foo_protect:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset %rbp, -16
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; CHECK-NEXT: movq %rsp, %rbp
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; CHECK-NEXT: .cfi_def_cfa_register %rbp
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; CHECK-NEXT: movq %rsp, %r11
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; CHECK-NEXT: andq $-65536, %r11 # imm = 0xFFFF0000
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; CHECK-NEXT: cmpq %rsp, %r11
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; CHECK-NEXT: je .LBB1_4
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; CHECK-NEXT:# %bb.1:
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; CHECK-NEXT: subq $4096, %rsp # imm = 0x1000
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; CHECK-NEXT: cmpq %rsp, %r11
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; CHECK-NEXT: jb .LBB1_3
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; CHECK-NEXT:.LBB1_2: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: movq $0, (%rsp)
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; CHECK-NEXT: subq $4096, %rsp # imm = 0x1000
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; CHECK-NEXT: cmpq %rsp, %r11
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; CHECK-NEXT: jb .LBB1_2
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; CHECK-NEXT:.LBB1_3:
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; CHECK-NEXT: movq %r11, %rsp
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; CHECK-NEXT: movq $0, (%rsp)
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; CHECK-NEXT:.LBB1_4:
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; CHECK-NEXT: movq %rsp, %r11
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; CHECK-NEXT: subq $65536, %r11 # imm = 0x10000
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; CHECK-NEXT:.LBB1_5: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: subq $4096, %rsp # imm = 0x1000
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; CHECK-NEXT: movq $0, (%rsp)
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; CHECK-NEXT: cmpq %r11, %rsp
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; CHECK-NEXT: jne .LBB1_5
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; CHECK-NEXT:# %bb.6:
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; CHECK-NEXT: movl $1, 392(%rsp)
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; CHECK-NEXT: movl (%rsp), %eax
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; CHECK-NEXT: movq %rbp, %rsp
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_def_cfa %rsp, 8
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; CHECK-NEXT: retq
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%a = alloca i32, i64 100, align 65536
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%b = getelementptr inbounds i32, i32* %a, i64 98
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store volatile i32 1, i32* %b
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%c = load volatile i32, i32* %a
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ret i32 %c
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}
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attributes #0 = {"probe-stack"="inline-asm"}
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