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1; Test decrementing until to a minimum value. Expect a compare-and-swap loop.2;3; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s4 5define i64 @f1(ptr %src, i64 %b) {6; CHECK-LABEL: f1:7; CHECK: lgr [[SRC:%r[0-9]+]], %r28; CHECK: lg [[RI:%r[0-9]+]], 0(%r2)9; CHECK: j [[L2:\.L.+]]10; CHECK: [[L1:\.L.+]]:11; CHECK: csg [[RI]], [[RO:%r[0-9]+]], 0([[SRC]])12; CHECK: je [[L4:\.L.+]]13; CHECK: [[L2]]:14; CHECK: lgr [[RO]], [[RI]]15; CHECK: slgfi [[RO]], 116; CHECK: lgr [[RB:%r[0-9]+]], %r317; CHECK: clgrjh [[RI]], %r3, [[L3:\.L.+]]18; CHECK: lgr [[RB]], [[RO]]19; CHECK: [[L3]]:20; CHECK: lgr [[RO]], [[RI]]21; CHECK: slgfi [[RO]], 122; CHECK: lgr [[RO]], %r323; CHECK: jle [[L1]]24; CHECK: [[L4]]:25; CHECK: br %r1426 %res = atomicrmw udec_wrap ptr %src, i64 %b seq_cst27 ret i64 %res28}29