1; Test 8-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 i8 @f1(i8 %dummy, i8 *%src, i8 %cmp, i8 %swap) { 14; CHECK-MAIN-LABEL: f1: 15; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r3, 0, 189, 0{{$}} 16; CHECK-MAIN-DAG: sll %r3, 3 17; CHECK-MAIN-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]]) 18; CHECK-MAIN-DAG: llcr %r4, %r4 19; CHECK-MAIN: [[LOOP:\.[^ ]*]]: 20; CHECK-MAIN: rll %r2, [[OLD]], 8(%r3) 21; CHECK-MAIN: risbg %r5, %r2, 32, 55, 0 22; CHECK-MAIN: llcr %r2, %r2 23; CHECK-MAIN: crjlh %r2, %r4, [[EXIT:\.[^ ]*]] 24; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r5, -8({{%r[1-9]+}}) 25; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]]) 26; CHECK-MAIN: jl [[LOOP]] 27; CHECK-MAIN: [[EXIT]]: 28; CHECK-MAIN-NOT: %r2 29; CHECK-MAIN: br %r14 30; 31; CHECK-SHIFT-LABEL: f1: 32; CHECK-SHIFT: sll [[SHIFT:%r[1-9]+]], 3 33; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]] 34; CHECK-SHIFT: rll 35; CHECK-SHIFT: rll {{%r[0-9]+}}, %r5, -8([[NEGSHIFT]]) 36 %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst 37 %res = extractvalue { i8, i1 } %pair, 0 38 ret i8 %res 39} 40 41; Check compare and swap with constants. We should force the constants into 42; registers and use the sequence above. 43define i8 @f2(i8 *%src) { 44; CHECK-LABEL: f2: 45; CHECK: lhi [[CMP:%r[0-9]+]], 42 46; CHECK: risbg [[CMP]], {{%r[0-9]+}}, 32, 55, 0 47; CHECK: risbg 48; CHECK: br %r14 49; 50; CHECK-SHIFT-LABEL: f2: 51; CHECK-SHIFT: lhi [[SWAP:%r[0-9]+]], 88 52; CHECK-SHIFT: risbg [[SWAP]], {{%r[0-9]+}}, 32, 55, 0 53; CHECK-SHIFT: br %r14 54 %pair = cmpxchg i8 *%src, i8 42, i8 88 seq_cst seq_cst 55 %res = extractvalue { i8, i1 } %pair, 0 56 ret i8 %res 57} 58 59; Check generating the comparison result. 60define i32 @f3(i8 %dummy, i8 *%src, i8 %cmp, i8 %swap) { 61; CHECK-MAIN-LABEL: f3: 62; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r3, 0, 189, 0{{$}} 63; CHECK-MAIN-DAG: sll %r3, 3 64; CHECK-MAIN-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]]) 65; CHECK-MAIN-DAG: llcr %r2, %r4 66; CHECK-MAIN: [[LOOP:\.[^ ]*]]: 67; CHECK-MAIN: rll [[TMP:%r[0-9]+]], [[OLD]], 8(%r3) 68; CHECK-MAIN: risbg %r5, [[TMP]], 32, 55, 0 69; CHECK-MAIN: llcr [[TMP2:%r[0-9]+]], [[TMP]] 70; CHECK-MAIN: cr [[TMP2]], %r2 71; CHECK-MAIN: jlh [[EXIT:\.[^ ]*]] 72; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r5, -8({{%r[1-9]+}}) 73; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]]) 74; CHECK-MAIN: jl [[LOOP]] 75; CHECK-MAIN: [[EXIT]]: 76; CHECK-MAIN-NEXT: ipm %r2 77; CHECK-MAIN-NEXT: afi %r2, -268435456 78; CHECK-MAIN-NEXT: srl %r2, 31 79; CHECK-MAIN-NOT: %r2 80; CHECK-MAIN: br %r14 81; 82; CHECK-SHIFT-LABEL: f3: 83; CHECK-SHIFT: sll [[SHIFT:%r[1-9]+]], 3 84; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]] 85; CHECK-SHIFT: rll 86; CHECK-SHIFT: rll {{%r[0-9]+}}, %r5, -8([[NEGSHIFT]]) 87 %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst 88 %val = extractvalue { i8, i1 } %pair, 1 89 %res = zext i1 %val to i32 90 ret i32 %res 91} 92 93 94declare void @g() 95 96; Check using the comparison result for a branch. 97; CHECK-LABEL: f4 98; CHECK-MAIN-LABEL: f4: 99; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r2, 0, 189, 0{{$}} 100; CHECK-MAIN-DAG: sll %r2, 3 101; CHECK-MAIN-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]]) 102; CHECK-MAIN-DAG: llcr %r3, %r3 103; CHECK-MAIN: [[LOOP:\.[^ ]*]]: 104; CHECK-MAIN: rll [[TMP:%r[0-9]+]], [[OLD]], 8(%r2) 105; CHECK-MAIN: risbg %r4, [[TMP]], 32, 55, 0 106; CHECK-MAIN: llcr [[TMP]], [[TMP]] 107; CHECK-MAIN: cr [[TMP]], %r3 108; CHECK-MAIN: jlh [[EXIT:\.[^ ]*]] 109; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r4, -8({{%r[1-9]+}}) 110; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]]) 111; CHECK-MAIN: jl [[LOOP]] 112; CHECK-MAIN: [[EXIT]]: 113; CHECK-MAIN-NEXT: jlh [[LABEL:\.[^ ]*]] 114; CHECK-MAIN: jg g 115; CHECK-MAIN: [[LABEL]]: 116; CHECK-MAIN: br %r14 117; 118; CHECK-SHIFT-LABEL: f4: 119; CHECK-SHIFT: sll %r2, 3 120; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], %r2 121; CHECK-SHIFT: rll 122; CHECK-SHIFT: rll {{%r[0-9]+}}, %r4, -8([[NEGSHIFT]]) 123define void @f4(i8 *%src, i8 %cmp, i8 %swap) { 124 %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst 125 %cond = extractvalue { i8, i1 } %pair, 1 126 br i1 %cond, label %call, label %exit 127 128call: 129 tail call void @g() 130 br label %exit 131 132exit: 133 ret void 134} 135 136; ... and the same with the inverted direction. 137; CHECK-MAIN-LABEL: f5: 138; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r2, 0, 189, 0{{$}} 139; CHECK-MAIN-DAG: sll %r2, 3 140; CHECK-MAIN-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]]) 141; CHECK-MAIN-DAG: llcr %r3, %r3 142; CHECK-MAIN: [[LOOP:\.[^ ]*]]: 143; CHECK-MAIN: rll [[TMP:%r[0-9]+]], [[OLD]], 8(%r2) 144; CHECK-MAIN: risbg %r4, [[TMP]], 32, 55, 0 145; CHECK-MAIN: llcr [[TMP]], [[TMP]] 146; CHECK-MAIN: cr [[TMP]], %r3 147; CHECK-MAIN: jlh [[EXIT:\.[^ ]*]] 148; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r4, -8({{%r[1-9]+}}) 149; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]]) 150; CHECK-MAIN: jl [[LOOP]] 151; CHECK-MAIN: [[EXIT]]: 152; CHECK-MAIN-NEXT: jlh [[LABEL:\.[^ ]*]] 153; CHECK-MAIN: br %r14 154; CHECK-MAIN: [[LABEL]]: 155; CHECK-MAIN: jg g 156; 157; CHECK-SHIFT-LABEL: f5: 158; CHECK-SHIFT: sll %r2, 3 159; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], %r2 160; CHECK-SHIFT: rll 161; CHECK-SHIFT: rll {{%r[0-9]+}}, %r4, -8([[NEGSHIFT]]) 162define void @f5(i8 *%src, i8 %cmp, i8 %swap) { 163 %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst 164 %cond = extractvalue { i8, i1 } %pair, 1 165 br i1 %cond, label %exit, label %call 166 167call: 168 tail call void @g() 169 br label %exit 170 171exit: 172 ret void 173} 174 175