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b3cabb44c3
RISBG can handle some ANDs for which no AND IMMEDIATE exists. It also acts as a three-operand AND for some cases where an AND IMMEDIATE could be used instead. It might be worth adding a pass to replace RISBG with AND IMMEDIATE in cases where the register operands end up being the same and where AND IMMEDIATE is smaller. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186072 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
2.0 KiB
LLVM
56 lines
2.0 KiB
LLVM
; Test 8-bit compare and swap.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-MAIN
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT
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; Check compare and swap 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(i8 %dummy, i8 *%src, i8 %cmp, i8 %swap) {
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; CHECK-MAIN: f1:
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; CHECK-MAIN-DAG: sllg [[SHIFT:%r[1-9]+]], %r3, 3
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; CHECK-MAIN-DAG: risbg [[BASE:%r[1-9]+]], %r3, 0, 189, 0
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; CHECK-MAIN: l [[OLD:%r[0-9]+]], 0([[BASE]])
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; CHECK-MAIN: [[LOOP:\.[^ ]*]]:
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; CHECK-MAIN: rll %r2, [[OLD]], 8([[SHIFT]])
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; CHECK-MAIN: risbg %r4, %r2, 32, 55, 0
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; CHECK-MAIN: crjlh %r2, %r4, [[EXIT:\.[^ ]*]]
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; CHECK-MAIN: risbg %r5, %r2, 32, 55, 0
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; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r5, -8({{%r[1-9]+}})
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; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[BASE]])
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; CHECK-MAIN: jlh [[LOOP]]
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; CHECK-MAIN: [[EXIT]]:
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; CHECK-MAIN-NOT: %r2
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; CHECK-MAIN: br %r14
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;
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; CHECK-SHIFT: f1:
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; CHECK-SHIFT: sllg [[SHIFT:%r[1-9]+]], %r3, 3
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; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]]
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; CHECK-SHIFT: rll
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; CHECK-SHIFT: rll {{%r[0-9]+}}, %r5, -8([[NEGSHIFT]])
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%res = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst
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ret i8 %res
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}
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; Check compare and swap with constants. We should force the constants into
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; registers and use the sequence above.
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define i8 @f2(i8 *%src) {
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; CHECK: f2:
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; CHECK: lhi [[CMP:%r[0-9]+]], 42
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; CHECK: risbg [[CMP]], {{%r[0-9]+}}, 32, 55, 0
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; CHECK: risbg
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; CHECK: br %r14
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;
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; CHECK-SHIFT: f2:
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; CHECK-SHIFT: lhi [[SWAP:%r[0-9]+]], 88
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; CHECK-SHIFT: risbg
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; CHECK-SHIFT: risbg [[SWAP]], {{%r[0-9]+}}, 32, 55, 0
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; CHECK-SHIFT: br %r14
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%res = cmpxchg i8 *%src, i8 42, i8 88 seq_cst
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ret i8 %res
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}
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