| ; 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 [[RO]], [[RI]] |
| ; CHECK: slgfi [[RO]], 1 |
| ; CHECK: lgr [[RB:%r[0-9]+]], %r3 |
| ; CHECK: clgrjh [[RI]], %r3, [[L3:\.L.+]] |
| ; CHECK: lgr [[RB]], [[RO]] |
| ; 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 |
| } |
