archived-llvm/atomic-load-04.ll at testing - archived-llvm - Free-Git: DMCA Non-Compliant

RPCS3/archived-llvm

mirror of https://github.com/RPCS3/llvm.git synced 2026-01-31 01:25:19 +01:00

Files

Ulrich Weigand 48ff7cfe27 [SystemZ] Eliminate unnecessary serialization operations

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

2017-08-04 18:53:35 +00:00

12 lines

246 B

LLVM

Raw Permalink Blame History

 ; Test 64-bit atomic loads.
 ;
 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
 define i64 @f1(i64 *%src) {
 ; CHECK-LABEL: f1:
 ; CHECK: lg %r2, 0(%r2)
 ; CHECK: br %r14
   %val = load atomic i64 , i64 *%src seq_cst, align 8
   ret i64 %val
 }