a1710eb3cd
The LIT test cases were migrated with the script provided by Nikita Popov. No manual changes were made. Committed without review since no functional changes, after consultation with uweigand.
56 lines
1.8 KiB
LLVM
56 lines
1.8 KiB
LLVM
; Test 8-bit atomic exchange.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT
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; Check exchange with a variable.
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; - CHECK is for the main loop.
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; - CHECK-SHIFT makes sure that the negated shift count used by the second
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; RLL is set up correctly. The negation is independent of the NILL and L
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; tested in CHECK. CHECK-SHIFT also checks that %r3 is not modified before
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; being used in the RISBG (in contrast to things like atomic addition,
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; which shift %r3 left so that %b is at the high end of the word).
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define i8 @f1(ptr %src, i8 %b) {
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; CHECK-LABEL: f1:
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; CHECK: risbg [[RISBG:%r[1-9]+]], %r2, 0, 189, 0{{$}}
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; CHECK-DAG: sll %r2, 3
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; CHECK-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]])
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; CHECK: [[LABEL:\.[^:]*]]:
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; CHECK: rll [[ROT:%r[0-9]+]], [[OLD]], 0(%r2)
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; CHECK: risbg [[ROT]], %r3, 32, 39, 24
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; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0({{%r[1-9]+}})
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; CHECK: cs [[OLD]], [[NEW]], 0([[RISBG]])
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; CHECK: jl [[LABEL]]
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; CHECK: rll %r2, [[OLD]], 8(%r2)
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; CHECK: br %r14
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;
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; CHECK-SHIFT-LABEL: f1:
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; CHECK-SHIFT-NOT: %r3
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; CHECK-SHIFT: sll %r2, 3
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; CHECK-SHIFT-NOT: %r3
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; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], %r2
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; CHECK-SHIFT-NOT: %r3
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; CHECK-SHIFT: rll
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; CHECK-SHIFT-NOT: %r3
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; CHECK-SHIFT: risbg {{%r[0-9]+}}, %r3, 32, 39, 24
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; CHECK-SHIFT: rll {{%r[0-9]+}}, {{%r[0-9]+}}, 0([[NEGSHIFT]])
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; CHECK-SHIFT: rll
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; CHECK-SHIFT: br %r14
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%res = atomicrmw xchg ptr %src, i8 %b seq_cst
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ret i8 %res
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}
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; Check exchange with a constant. We should force the constant into
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; a register and use the sequence above.
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define i8 @f2(ptr %src) {
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; CHECK-LABEL: f2:
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; CHECK: lhi [[VALUE:%r[0-9]+]], 88
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; CHECK: risbg {{%r[0-9]+}}, [[VALUE]], 32, 39, 24
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; CHECK: br %r14
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;
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; CHECK-SHIFT-LABEL: f2:
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; CHECK-SHIFT: br %r14
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%res = atomicrmw xchg ptr %src, i8 88 seq_cst
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ret i8 %res
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}
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