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zapnot the signed bits in atomic_cmpset_32. Previously this did not work with

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negative values because the original value was sign extended but the compared
value was not.
This commit is contained in:
Jeff Roberson 2002-05-08 05:19:56 +00:00
parent 8b637659da
commit c4b689f10a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=96211
1 changed files with 1 additions and 0 deletions
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sys/alpha/include/atomic.h
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@ -356,6 +356,7 @@ atomic_cmpset_32(volatile u_int32_t* p, u_int32_t cmpval, u_int32_t newval)
__asm __volatile (
"1:\tldl_l %0, %4\n\t" /* load old value */
"zapnot %0,0xf,%0\n\t" /* Chop of signed bits */
"cmpeq %0, %2, %0\n\t" /* compare */
"beq %0, 2f\n\t" /* exit if not equal */
"mov %3, %0\n\t" /* value to store */