forked from OSchip/llvm-project
56 lines
1.9 KiB
LLVM
56 lines
1.9 KiB
LLVM
; Test 16-bit atomic exchange.
|
|
;
|
|
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
|
|
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT
|
|
|
|
; Check exchange 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 i16 @f1(i16 *%src, i16 %b) {
|
|
; CHECK-LABEL: f1:
|
|
; CHECK: risbg [[RISBG:%r[1-9]+]], %r2, 0, 189, 0{{$}}
|
|
; CHECK-DAG: sll %r2, 3
|
|
; CHECK-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]])
|
|
; CHECK: [[LABEL:\.[^:]*]]:
|
|
; CHECK: rll [[ROT:%r[0-9]+]], [[OLD]], 0(%r2)
|
|
; CHECK: risbg [[ROT]], %r3, 32, 47, 16
|
|
; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0({{%r[1-9]+}})
|
|
; CHECK: cs [[OLD]], [[NEW]], 0([[RISBG]])
|
|
; CHECK: jl [[LABEL]]
|
|
; CHECK: rll %r2, [[OLD]], 16(%r2)
|
|
; CHECK: br %r14
|
|
;
|
|
; CHECK-SHIFT-LABEL: f1:
|
|
; CHECK-SHIFT-NOT: %r3
|
|
; CHECK-SHIFT: sll %r2, 3
|
|
; CHECK-SHIFT-NOT: %r3
|
|
; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], %r2
|
|
; CHECK-SHIFT-NOT: %r3
|
|
; CHECK-SHIFT: rll
|
|
; CHECK-SHIFT-NOT: %r3
|
|
; CHECK-SHIFT: risbg {{%r[0-9]+}}, %r3, 32, 47, 16
|
|
; CHECK-SHIFT: rll {{%r[0-9]+}}, {{%r[0-9]+}}, 0([[NEGSHIFT]])
|
|
; CHECK-SHIFT: rll
|
|
; CHECK-SHIFT: br %r14
|
|
%res = atomicrmw xchg i16 *%src, i16 %b seq_cst
|
|
ret i16 %res
|
|
}
|
|
|
|
; Check exchange with a constant. We should force the constant into
|
|
; a register and use the sequence above.
|
|
define i16 @f2(i16 *%src) {
|
|
; CHECK-LABEL: f2:
|
|
; CHECK: lhi [[VALUE:%r[0-9]+]], -25536
|
|
; CHECK: risbg {{%r[0-9]+}}, [[VALUE]], 32, 47, 16
|
|
; CHECK: br %r14
|
|
;
|
|
; CHECK-SHIFT-LABEL: f2:
|
|
; CHECK-SHIFT: br %r14
|
|
%res = atomicrmw xchg i16 *%src, i16 40000 seq_cst
|
|
ret i16 %res
|
|
}
|