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48ff7cfe27
We currently emit a serialization operation (bcr 14, 0) before every atomic load and after every atomic store. This is overly conservative. The SystemZ architecture actually does not require any serialization for atomic loads, and a serialization after an atomic store only if we need to enforce sequential consistency. This is what other compilers for the platform implement as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310093 91177308-0d34-0410-b5e6-96231b3b80d8
22 lines
472 B
LLVM
22 lines
472 B
LLVM
; Test 8-bit atomic stores.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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define void @f1(i8 %val, i8 *%src) {
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; CHECK-LABEL: f1:
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; CHECK: stc %r2, 0(%r3)
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; CHECK: bcr 1{{[45]}}, %r0
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; CHECK: br %r14
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store atomic i8 %val, i8 *%src seq_cst, align 1
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ret void
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}
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define void @f2(i8 %val, i8 *%src) {
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; CHECK-LABEL: f2:
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; CHECK: stc %r2, 0(%r3)
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; CHECK-NOT: bcr 1{{[45]}}, %r0
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; CHECK: br %r14
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store atomic i8 %val, i8 *%src monotonic, align 1
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ret void
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}
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