* [9fans] 6c + volatile
@ 2011-12-08 16:45 erik quanstrom
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From: erik quanstrom @ 2011-12-08 16:45 UTC (permalink / raw)
To: 9fans
magic was declared alternately as an int, volatile int and int volatile.
(because i always get that backwards.) in all cases, the assembly was this:
main+0x168 0x0020039d MOVL magic(SB),CX
main+0x16f 0x002003a4 CMPL CX,$0x1
main+0x172 0x002003a7 JNE main+0x16f(SB)
perhaps i'm not reading the standard correctly, but i would have expected
vloop:
MOVL magic(SB), CX
CMPL CX, $1
JNE vloop
instead. obviously, this doesn't happen when magic is an int*.
- erik
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