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[dev.power64] runtime: test CAS on large unsigned 32-bit numbers

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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
This commit is contained in:
Austin Clements 2014-10-30 11:17:26 -04:00
parent 097362fd2e
commit 36d417c0e3
1 changed files with 6 additions and 0 deletions
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6
src/runtime/runtime.c
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@ -226,6 +226,12 @@ runtime·check(void)
if(z != 4) if(z != 4)
runtime·throw("cas4"); runtime·throw("cas4");
z = 0xffffffff;
if(!runtime·cas(&z, 0xffffffff, 0xfffffffe))
runtime·throw("cas5");
if(z != 0xfffffffe)
runtime·throw("cas6");
k = (byte*)0xfedcb123; k = (byte*)0xfedcb123;
if(sizeof(void*) == 8) if(sizeof(void*) == 8)
k = (byte*)((uintptr)k<<10); k = (byte*)((uintptr)k<<10);