1*9880d681SAndroid Build Coastguard Worker; Test 16-bit compare and swap. 2*9880d681SAndroid Build Coastguard Worker; 3*9880d681SAndroid Build Coastguard Worker; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-MAIN 4*9880d681SAndroid Build Coastguard Worker; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT 5*9880d681SAndroid Build Coastguard Worker 6*9880d681SAndroid Build Coastguard Worker; Check compare and swap with a variable. 7*9880d681SAndroid Build Coastguard Worker; - CHECK is for the main loop. 8*9880d681SAndroid Build Coastguard Worker; - CHECK-SHIFT makes sure that the negated shift count used by the second 9*9880d681SAndroid Build Coastguard Worker; RLL is set up correctly. The negation is independent of the NILL and L 10*9880d681SAndroid Build Coastguard Worker; tested in CHECK. CHECK-SHIFT also checks that %r3 is not modified before 11*9880d681SAndroid Build Coastguard Worker; being used in the RISBG (in contrast to things like atomic addition, 12*9880d681SAndroid Build Coastguard Worker; which shift %r3 left so that %b is at the high end of the word). 13*9880d681SAndroid Build Coastguard Workerdefine i16 @f1(i16 %dummy, i16 *%src, i16 %cmp, i16 %swap) { 14*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN-LABEL: f1: 15*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r3, 0, 189, 0{{$}} 16*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: sll %r3, 3 17*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: l [[OLD:%r[0-9]+]], 0([[RISBG]]) 18*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: [[LOOP:\.[^ ]*]]: 19*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: rll %r2, [[OLD]], 16(%r3) 20*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: risbg %r4, %r2, 32, 47, 0 21*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: crjlh %r2, %r4, [[EXIT:\.[^ ]*]] 22*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: risbg %r5, %r2, 32, 47, 0 23*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r5, -16({{%r[1-9]+}}) 24*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]]) 25*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: jl [[LOOP]] 26*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: [[EXIT]]: 27*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN-NOT: %r2 28*9880d681SAndroid Build Coastguard Worker; CHECK-MAIN: br %r14 29*9880d681SAndroid Build Coastguard Worker; 30*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT-LABEL: f1: 31*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT: sll %r3, 3 32*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], %r3 33*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT: rll 34*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT: rll {{%r[0-9]+}}, %r5, -16([[NEGSHIFT]]) 35*9880d681SAndroid Build Coastguard Worker %pair = cmpxchg i16 *%src, i16 %cmp, i16 %swap seq_cst seq_cst 36*9880d681SAndroid Build Coastguard Worker %res = extractvalue { i16, i1 } %pair, 0 37*9880d681SAndroid Build Coastguard Worker ret i16 %res 38*9880d681SAndroid Build Coastguard Worker} 39*9880d681SAndroid Build Coastguard Worker 40*9880d681SAndroid Build Coastguard Worker; Check compare and swap with constants. We should force the constants into 41*9880d681SAndroid Build Coastguard Worker; registers and use the sequence above. 42*9880d681SAndroid Build Coastguard Workerdefine i16 @f2(i16 *%src) { 43*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: f2: 44*9880d681SAndroid Build Coastguard Worker; CHECK: lhi [[CMP:%r[0-9]+]], 42 45*9880d681SAndroid Build Coastguard Worker; CHECK: risbg [[CMP]], {{%r[0-9]+}}, 32, 47, 0 46*9880d681SAndroid Build Coastguard Worker; CHECK: risbg 47*9880d681SAndroid Build Coastguard Worker; CHECK: br %r14 48*9880d681SAndroid Build Coastguard Worker; 49*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT-LABEL: f2: 50*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT: lhi [[SWAP:%r[0-9]+]], 88 51*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT: risbg 52*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT: risbg [[SWAP]], {{%r[0-9]+}}, 32, 47, 0 53*9880d681SAndroid Build Coastguard Worker; CHECK-SHIFT: br %r14 54*9880d681SAndroid Build Coastguard Worker %pair = cmpxchg i16 *%src, i16 42, i16 88 seq_cst seq_cst 55*9880d681SAndroid Build Coastguard Worker %res = extractvalue { i16, i1 } %pair, 0 56*9880d681SAndroid Build Coastguard Worker ret i16 %res 57*9880d681SAndroid Build Coastguard Worker} 58