1; Test decrementing until to a minimum value. Expect a compare-and-swap loop. 2; 3; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s 4 5define i64 @f1(ptr %src, i64 %b) { 6; CHECK-LABEL: f1: 7; CHECK: lgr [[SRC:%r[0-9]+]], %r2 8; 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]], 1 16; CHECK: lgr [[RB:%r[0-9]+]], %r3 17; CHECK: clgrjh [[RI]], %r3, [[L3:\.L.+]] 18; CHECK: lgr [[RB]], [[RO]] 19; CHECK: [[L3]]: 20; CHECK: lgr [[RO]], [[RI]] 21; CHECK: slgfi [[RO]], 1 22; CHECK: lgr [[RO]], %r3 23; CHECK: jle [[L1]] 24; CHECK: [[L4]]: 25; CHECK: br %r14 26 %res = atomicrmw udec_wrap ptr %src, i64 %b seq_cst 27 ret i64 %res 28} 29