| ; Test 8-bit compare and swap. |
| ; |
| ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-MAIN |
| ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT |
| |
| ; Check compare and swap with a variable. |
| ; - CHECK is for the main loop. |
| ; - CHECK-SHIFT makes sure that the negated shift count used by the second |
| ; RLL is set up correctly. The negation is independent of the NILL and L |
| ; tested in CHECK. CHECK-SHIFT also checks that %r3 is not modified before |
| ; being used in the RISBG (in contrast to things like atomic addition, |
| ; which shift %r3 left so that %b is at the high end of the word). |
| define i8 @f1(i8 %dummy, i8 *%src, i8 %cmp, i8 %swap) { |
| ; CHECK-MAIN-LABEL: f1: |
| ; CHECK-MAIN: sllg [[SHIFT:%r[1-9]+]], %r3, 3 |
| ; CHECK-MAIN: nill %r3, 65532 |
| ; CHECK-MAIN: l [[OLD:%r[0-9]+]], 0(%r3) |
| ; CHECK-MAIN: [[LOOP:\.[^ ]*]]: |
| ; CHECK-MAIN: rll %r2, [[OLD]], 8([[SHIFT]]) |
| ; CHECK-MAIN: risbg %r4, %r2, 32, 55, 0 |
| ; CHECK-MAIN: crjlh %r2, %r4, [[EXIT:\.[^ ]*]] |
| ; CHECK-MAIN: risbg %r5, %r2, 32, 55, 0 |
| ; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r5, -8({{%r[1-9]+}}) |
| ; CHECK-MAIN: cs [[OLD]], [[NEW]], 0(%r3) |
| ; CHECK-MAIN: jl [[LOOP]] |
| ; CHECK-MAIN: [[EXIT]]: |
| ; CHECK-MAIN-NOT: %r2 |
| ; CHECK-MAIN: br %r14 |
| ; |
| ; CHECK-SHIFT-LABEL: f1: |
| ; CHECK-SHIFT: sllg [[SHIFT:%r[1-9]+]], %r3, 3 |
| ; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]] |
| ; CHECK-SHIFT: rll |
| ; CHECK-SHIFT: rll {{%r[0-9]+}}, %r5, -8([[NEGSHIFT]]) |
| %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst |
| %res = extractvalue { i8, i1 } %pair, 0 |
| ret i8 %res |
| } |
| |
| ; Check compare and swap with constants. We should force the constants into |
| ; registers and use the sequence above. |
| define i8 @f2(i8 *%src) { |
| ; CHECK-LABEL: f2: |
| ; CHECK: lhi [[CMP:%r[0-9]+]], 42 |
| ; CHECK: risbg [[CMP]], {{%r[0-9]+}}, 32, 55, 0 |
| ; CHECK: risbg |
| ; CHECK: br %r14 |
| ; |
| ; CHECK-SHIFT-LABEL: f2: |
| ; CHECK-SHIFT: lhi [[SWAP:%r[0-9]+]], 88 |
| ; CHECK-SHIFT: risbg |
| ; CHECK-SHIFT: risbg [[SWAP]], {{%r[0-9]+}}, 32, 55, 0 |
| ; CHECK-SHIFT: br %r14 |
| %pair = cmpxchg i8 *%src, i8 42, i8 88 seq_cst seq_cst |
| %res = extractvalue { i8, i1 } %pair, 0 |
| ret i8 %res |
| } |