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| author | Austin Clements <austin@google.com> | 2014-10-30 11:17:26 -0400 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2014-10-30 11:17:26 -0400 |
| commit | 36d417c0e380b8ea762812b415796cf4b0af72de (patch) | |
| tree | 27e7ed7d548d9e04ebc1bb7820bde569a5cae98c | |
| parent | 097362fd2e01735b25b79c71ba6005cd38f81da0 (diff) | |
| download | go-36d417c0e380b8ea762812b415796cf4b0af72de.tar.gz go-36d417c0e380b8ea762812b415796cf4b0af72de.zip | |
[dev.power64] runtime: test CAS on large unsigned 32-bit numbers
This adds a test to runtime·check to ensure CAS of large
unsigned 32-bit numbers does not accidentally sign-extend its
arguments.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/162490044
| -rw-r--r-- | src/runtime/runtime.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/runtime/runtime.c b/src/runtime/runtime.c index f19f8e4be3..a684142848 100644 --- a/src/runtime/runtime.c +++ b/src/runtime/runtime.c @@ -226,6 +226,12 @@ runtime·check(void) if(z != 4) runtime·throw("cas4"); + z = 0xffffffff; + if(!runtime·cas(&z, 0xffffffff, 0xfffffffe)) + runtime·throw("cas5"); + if(z != 0xfffffffe) + runtime·throw("cas6"); + k = (byte*)0xfedcb123; if(sizeof(void*) == 8) k = (byte*)((uintptr)k<<10); |