forked from OSchip/llvm-project
34 lines
951 B
LLVM
34 lines
951 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=x86_64-apple-darwin < %s | FileCheck %s
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; This test checks that we don't try to narrow the volatile load by selecting
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; the pattern below into a testb instruction.
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define void @testb_volatile(i32 **%ptrptr) {
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; CHECK-LABEL: testb_volatile:
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; CHECK: ## %bb.0: ## %entry
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; CHECK-NEXT: movq (%rdi), %rax
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; CHECK-NEXT: testl $1, (%rax)
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; CHECK-NEXT: jne LBB0_1
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; CHECK-NEXT: ## %bb.2: ## %exit
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; CHECK-NEXT: movl $1, (%rax)
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; CHECK-NEXT: retq
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; CHECK-NEXT: LBB0_1: ## %bb2
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; CHECK-NEXT: movl $0, (%rax)
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; CHECK-NEXT: retq
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entry:
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%ptr = load i32*, i32** %ptrptr, align 8
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%vol_load = load volatile i32, i32* %ptr, align 4
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%and = and i32 %vol_load, 1
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%cmp = icmp eq i32 %and, 0
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br i1 %cmp, label %exit, label %bb2
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bb2:
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store i32 0, i32 *%ptr, align 4
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ret void
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exit:
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store i32 1, i32 *%ptr, align 4
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ret void
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}
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