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