Ulrich Weigand 31112895d9 [SystemZ] Directly use CC result of compare-and-swap ...

In order to implement a test whether a compare-and-swap succeeded, the
SystemZ back-end currently emits a rather inefficient sequence of first
converting the CC result into an integer, and then testing that integer
against zero.  This commit changes the back-end to simply directly test
the CC value set by the compare-and-swap instruction.

llvm-svn: 322988

2018-01-19 20:54:18 +00:00

5.4 KiB

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