28 lines
777 B
LLVM
28 lines
777 B
LLVM
; Test decrementing until to a minimum value. Expect a compare-and-swap loop.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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define i64 @f1(ptr %src, i64 %b) {
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; CHECK-LABEL: f1:
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; CHECK: lgr [[SRC:%r[0-9]+]], %r2
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; CHECK: lg [[RI:%r[0-9]+]], 0(%r2)
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; CHECK: j [[L2:\.L.+]]
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; CHECK: [[L1:\.L.+]]:
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; CHECK: csg [[RI]], [[RO:%r[0-9]+]], 0([[SRC]])
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; CHECK: je [[L4:\.L.+]]
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; CHECK: [[L2]]:
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; CHECK: lgr [[RO]], [[RI]]
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; CHECK: slgfi [[RO]], 1
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; CHECK: lgr [[RB:%r[0-9]+]], %r3
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; CHECK: clgrjh [[RI]], %r3, [[L3:\.L.+]]
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; CHECK: lgr [[RB]], [[RO]]
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; CHECK: [[L3]]:
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; CHECK: lgr [[RO]], [[RI]]
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; CHECK: slgfi [[RO]], 1
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; CHECK: lgr [[RO]], %r3
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; CHECK: jle [[L1]]
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; CHECK: [[L4]]:
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; CHECK: br %r14
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%res = atomicrmw udec_wrap ptr %src, i64 %b seq_cst
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ret i64 %res
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}
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