1 ; Test 8-bit atomic exchange. 2 ; 3 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK 4 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT 5 6 ; Check exchange 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). 13 define i8 @f1(i8 *%src, i8 %b) { 14 ; CHECK-LABEL: f1: 15 ; CHECK: sllg [[SHIFT:%r[1-9]+]], %r2, 3 16 ; CHECK: nill %r2, 65532 17 ; CHECK: l [[OLD:%r[0-9]+]], 0(%r2) 18 ; CHECK: [[LABEL:\.[^:]*]]: 19 ; CHECK: rll [[ROT:%r[0-9]+]], [[OLD]], 0([[SHIFT]]) 20 ; CHECK: risbg [[ROT]], %r3, 32, 39, 24 21 ; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0({{%r[1-9]+}}) 22 ; CHECK: cs [[OLD]], [[NEW]], 0(%r2) 23 ; CHECK: jl [[LABEL]] 24 ; CHECK: rll %r2, [[OLD]], 8([[SHIFT]]) 25 ; CHECK: br %r14 26 ; 27 ; CHECK-SHIFT-LABEL: f1: 28 ; CHECK-SHIFT-NOT: %r3 29 ; CHECK-SHIFT: sllg [[SHIFT:%r[1-9]+]], %r2, 3 30 ; CHECK-SHIFT-NOT: %r3 31 ; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]] 32 ; CHECK-SHIFT-NOT: %r3 33 ; CHECK-SHIFT: rll 34 ; CHECK-SHIFT-NOT: %r3 35 ; CHECK-SHIFT: risbg {{%r[0-9]+}}, %r3, 32, 39, 24 36 ; CHECK-SHIFT: rll {{%r[0-9]+}}, {{%r[0-9]+}}, 0([[NEGSHIFT]]) 37 ; CHECK-SHIFT: rll 38 ; CHECK-SHIFT: br %r14 39 %res = atomicrmw xchg i8 *%src, i8 %b seq_cst 40 ret i8 %res 41 } 42 43 ; Check exchange with a constant. We should force the constant into 44 ; a register and use the sequence above. 45 define i8 @f2(i8 *%src) { 46 ; CHECK-LABEL: f2: 47 ; CHECK: lhi [[VALUE:%r[0-9]+]], 88 48 ; CHECK: risbg {{%r[0-9]+}}, [[VALUE]], 32, 39, 24 49 ; CHECK: br %r14 50 ; 51 ; CHECK-SHIFT-LABEL: f2: 52 ; CHECK-SHIFT: br %r14 53 %res = atomicrmw xchg i8 *%src, i8 88 seq_cst 54 ret i8 %res 55 } 56
