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4ae19d2fd4
Ideally this is going to be and LLVM IR pass (shared, among others with AArch64), but for the time being just enable it if consumers ask us for optimization and not unconditionally. Discussed with Tim Northover on IRC. llvm-svn: 237837
16 lines
310 B
LLVM
16 lines
310 B
LLVM
; Ensure that adjacent duplicated barriers are not removed at -O0.
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; RUN: llc -O0 < %s -mtriple=armv7 -mattr=+db | FileCheck %s
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define i32 @t1() {
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entry:
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fence seq_cst
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fence seq_cst
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fence seq_cst
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ret i32 0
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}
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; CHECK: @ BB#0: @ %entry
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; CHECK-NEXT: dmb ish
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; CHECK-NEXT: dmb ish
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; CHECK-NEXT: dmb ish
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