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69fde521b5
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. llvm-svn: 310093
12 lines
240 B
LLVM
12 lines
240 B
LLVM
; Test 8-bit atomic loads.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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define i8 @f1(i8 *%src) {
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; CHECK-LABEL: f1:
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; CHECK: lb %r2, 0(%r2)
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; CHECK: br %r14
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%val = load atomic i8 , i8 *%src seq_cst, align 1
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ret i8 %val
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}
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