1; Test 16-bit compare and swap. 2; 3; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-MAIN 4; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT 5 6; Check compare and swap with a variable. 7; - CHECK is for the main loop. 8; - CHECK-SHIFT makes sure that the negated shift count used by the second 9; RLL is set up correctly. The negation is independent of the NILL and L 10; tested in CHECK. CHECK-SHIFT also checks that %r3 is not modified before 11; being used in the RISBG (in contrast to things like atomic addition, 12; which shift %r3 left so that %b is at the high end of the word). 13define i16 @f1(i16 %dummy, i16 *%src, i16 %cmp, i16 %swap) { 14; CHECK-MAIN-LABEL: f1: 15; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r3, 0, 189, 0{{$}} 16; CHECK-MAIN: sll %r3, 3 17; CHECK-MAIN: l [[OLD:%r[0-9]+]], 0([[RISBG]]) 18; CHECK-MAIN: [[LOOP:\.[^ ]*]]: 19; CHECK-MAIN: rll %r2, [[OLD]], 16(%r3) 20; CHECK-MAIN: risbg %r4, %r2, 32, 47, 0 21; CHECK-MAIN: crjlh %r2, %r4, [[EXIT:\.[^ ]*]] 22; CHECK-MAIN: risbg %r5, %r2, 32, 47, 0 23; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r5, -16({{%r[1-9]+}}) 24; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]]) 25; CHECK-MAIN: jl [[LOOP]] 26; CHECK-MAIN: [[EXIT]]: 27; CHECK-MAIN-NOT: %r2 28; CHECK-MAIN: br %r14 29; 30; CHECK-SHIFT-LABEL: f1: 31; CHECK-SHIFT: sll %r3, 3 32; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], %r3 33; CHECK-SHIFT: rll 34; CHECK-SHIFT: rll {{%r[0-9]+}}, %r5, -16([[NEGSHIFT]]) 35 %pair = cmpxchg i16 *%src, i16 %cmp, i16 %swap seq_cst seq_cst 36 %res = extractvalue { i16, i1 } %pair, 0 37 ret i16 %res 38} 39 40; Check compare and swap with constants. We should force the constants into 41; registers and use the sequence above. 42define i16 @f2(i16 *%src) { 43; CHECK-LABEL: f2: 44; CHECK: lhi [[CMP:%r[0-9]+]], 42 45; CHECK: risbg [[CMP]], {{%r[0-9]+}}, 32, 47, 0 46; CHECK: risbg 47; CHECK: br %r14 48; 49; CHECK-SHIFT-LABEL: f2: 50; CHECK-SHIFT: lhi [[SWAP:%r[0-9]+]], 88 51; CHECK-SHIFT: risbg 52; CHECK-SHIFT: risbg [[SWAP]], {{%r[0-9]+}}, 32, 47, 0 53; CHECK-SHIFT: br %r14 54 %pair = cmpxchg i16 *%src, i16 42, i16 88 seq_cst seq_cst 55 %res = extractvalue { i16, i1 } %pair, 0 56 ret i16 %res 57} 58