derek.holloway
7502bf64a4
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23 lines
927 B
LLVM
23 lines
927 B
LLVM
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -stop-after=finalize-isel < %s | FileCheck %s
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; The IR-specified alignment on atomicrmw / cmpxchg must be carried into the
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; MachineMemOperand, matching the atomic load/store paths in
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; SelectionDAGBuilder (which use I.getAlign()). Previously visitAtomicRMW and
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; visitAtomicCmpXchg used getEVTAlign(MemVT) (the natural type alignment),
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; silently discarding an over-aligned `align N`.
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define i32 @rmw_align(ptr %p) {
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; CHECK-LABEL: name: rmw_align
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; CHECK: LXADD32 {{.*}} :: (load store seq_cst (s32) on %ir.p, align 32)
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%r = atomicrmw add ptr %p, i32 1 seq_cst, align 32
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ret i32 %r
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}
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define i32 @cas_align(ptr %p, i32 %c, i32 %n) {
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; CHECK-LABEL: name: cas_align
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; CHECK: LCMPXCHG32 {{.*}} :: (load store seq_cst seq_cst (s32) on %ir.p, align 32)
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%r = cmpxchg ptr %p, i32 %c, i32 %n seq_cst seq_cst, align 32
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%v = extractvalue { i32, i1 } %r, 0
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ret i32 %v
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}
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