* [9fans] lmbench vs 8c
@ 1998-07-11 23:56 Scott
0 siblings, 0 replies; 3+ messages in thread
From: Scott @ 1998-07-11 23:56 UTC (permalink / raw)
Brandon Black <photon@dtmf.com> writes:
| Interesting.... but do you get the same problems with semi-valid code?
The original program was completely valid. I chopped it down just to
the point where the compiler bug manifested.
The fix (from bobf and ken) is to change, in gc.h,
char reg[D_NONE];
to
int reg[D_NONE];
And to change the initialization in txt.c to use a loop instead of memset.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [9fans] lmbench vs 8c
@ 1998-07-11 20:45 Brandon
0 siblings, 0 replies; 3+ messages in thread
From: Brandon @ 1998-07-11 20:45 UTC (permalink / raw)
Interesting.... but do you get the same problems with semi-valid code?
(I don't have plan9 installed currently, can't check myself). p is
uninitialized.... I wouldn't think that would affect things in this
compiler test, only at runtime... what happens if you actually create
the array being referenced, and set p to the beginning of the array, and
then test?
Brandon
schwartz@bio.cse.psu.edu wrote:
> The latest version of Larry McVoy's lmbench exercises the compiler
> in fun ways. Here's one:
>
> % cat reg.c
> void
> doit(void)
> {
> register int *p;
> int sum;
>
> sum =
> p[0]+p[1]+p[2]+p[3]+p[4]+p[5]+p[6]+p[7]+
> p[8]+p[9]+p[10]+p[11]+p[12]+p[13]+p[14]+
> p[15]+p[16]+p[17]+p[18]+p[19]+p[20]+p[21]+
> p[22]+p[23]+p[24]+p[25]+p[26]+p[27]+p[28]+
> p[29]+p[30]+p[31]+p[32]+p[33]+p[34]+p[35]+
> p[36]+p[37]+p[38]+p[39]+p[40]+p[41]+p[42]+
> p[43]+p[44]+p[45]+p[46]+p[47]+p[48]+p[49]+
> p[50]+p[51]+p[52]+p[53]+p[54]+p[55]+p[56]+
> p[57]+p[58]+p[59]+p[60]+p[61]+p[62]+p[63]+
> p[64]+p[65]+p[66]+p[67]+p[68]+p[69]+p[70]+
> p[71]+p[72]+p[73]+p[74]+p[75]+p[76]+p[77]+
> p[78]+p[79]+p[80]+p[81]+p[82]+p[83]+p[84]+
> p[85]+p[86]+p[87]+p[88]+p[89]+p[90]+p[91]+
> p[92]+p[93]+p[94]+p[95]+p[96]+p[97]+p[98]+
> p[99]+p[100]+p[101]+p[102]+p[103]+p[104]+
> p[105]+p[106]+p[107]+p[108]+p[109]+p[110]+
> p[111]+p[112]+p[113]+p[114]+p[115]+p[116]+
> p[117]+p[118]+p[119]+p[120]+p[121]+p[122]+
> p[123]+p[124]
> /* ok so far */
> +p[125] /* not ok */
> /*
> +p[126]+p[127]
> */
> ;
> }
>
> % 8c reg.c
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> reg.c:10 error in regfree: 8
> too many errors
^ permalink raw reply [flat|nested] 3+ messages in thread
* [9fans] lmbench vs 8c
@ 1998-07-11 8:29 schwartz
0 siblings, 0 replies; 3+ messages in thread
From: schwartz @ 1998-07-11 8:29 UTC (permalink / raw)
The latest version of Larry McVoy's lmbench exercises the compiler
in fun ways. Here's one:
% cat reg.c
void
doit(void)
{
register int *p;
int sum;
sum =
p[0]+p[1]+p[2]+p[3]+p[4]+p[5]+p[6]+p[7]+
p[8]+p[9]+p[10]+p[11]+p[12]+p[13]+p[14]+
p[15]+p[16]+p[17]+p[18]+p[19]+p[20]+p[21]+
p[22]+p[23]+p[24]+p[25]+p[26]+p[27]+p[28]+
p[29]+p[30]+p[31]+p[32]+p[33]+p[34]+p[35]+
p[36]+p[37]+p[38]+p[39]+p[40]+p[41]+p[42]+
p[43]+p[44]+p[45]+p[46]+p[47]+p[48]+p[49]+
p[50]+p[51]+p[52]+p[53]+p[54]+p[55]+p[56]+
p[57]+p[58]+p[59]+p[60]+p[61]+p[62]+p[63]+
p[64]+p[65]+p[66]+p[67]+p[68]+p[69]+p[70]+
p[71]+p[72]+p[73]+p[74]+p[75]+p[76]+p[77]+
p[78]+p[79]+p[80]+p[81]+p[82]+p[83]+p[84]+
p[85]+p[86]+p[87]+p[88]+p[89]+p[90]+p[91]+
p[92]+p[93]+p[94]+p[95]+p[96]+p[97]+p[98]+
p[99]+p[100]+p[101]+p[102]+p[103]+p[104]+
p[105]+p[106]+p[107]+p[108]+p[109]+p[110]+
p[111]+p[112]+p[113]+p[114]+p[115]+p[116]+
p[117]+p[118]+p[119]+p[120]+p[121]+p[122]+
p[123]+p[124]
/* ok so far */
+p[125] /* not ok */
/*
+p[126]+p[127]
*/
;
}
% 8c reg.c
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
reg.c:10 error in regfree: 8
too many errors
^ permalink raw reply [flat|nested] 3+ messages in thread
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