derek.holloway
7502bf64a4
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43 lines
1.6 KiB
LLVM
43 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
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; RUN: llc -O2 -stop-after=branch-folder %s -o - | FileCheck %s
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; BranchFolder tail-merge dedups MachineMemOperands using
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; MachineMemOperand::operator==. That comparison must include atomic
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; ordering and syncscope so that a `load atomic monotonic` is never
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; treated as identical to a plain `load` from the same address. If the
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; comparison ignored ordering, the two blocks below would be tail-merged
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; into a single `(load (s32))` MMO and the monotonic ordering would be
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; silently dropped from the resulting machine code.
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;
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; With the fix, BranchFolder still tail-merges the two identical
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; MOV32rm instructions (their operands are identical), but
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; cloneMergedMemRefs keeps both MMOs because they differ in atomic
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; ordering. Downstream passes therefore see the more-restrictive
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; monotonic ordering and cannot reorder past synchronization points.
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @no_drop_atomic_ordering(i1 %c, ptr %p) {
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; CHECK-LABEL: name: no_drop_atomic_ordering
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; CHECK: bb.0.entry:
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; CHECK-NEXT: liveins: $edi, $rsi
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: TEST8ri renamable $dil, 1, implicit-def $eflags, implicit killed $edi
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; CHECK-NEXT: renamable $eax = MOV32rm killed renamable $rsi, 1, $noreg, 0, $noreg :: (load (s32) from %ir.p), (load monotonic (s32) from %ir.p)
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; CHECK-NEXT: RET 0, $eax
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entry:
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br i1 %c, label %a, label %b
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a:
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%la = load atomic i32, ptr %p monotonic, align 4
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br label %end
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b:
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%lb = load i32, ptr %p, align 4
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br label %end
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end:
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%v = phi i32 [ %la, %a ], [ %lb, %b ]
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ret i32 %v
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}
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