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[Bug target/53385] "Error: operand out of range" after changes for LSHIFT_EXPR in vrp.c
- From: "amodra at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 17 May 2012 12:25:03 +0000
- Subject: [Bug target/53385] "Error: operand out of range" after changes for LSHIFT_EXPR in vrp.c
- Auto-submitted: auto-generated
- References: <bug-53385-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53385
--- Comment #4 from Alan Modra <amodra at gmail dot com> 2012-05-17 12:25:03 UTC ---
Here's the problem. Compiled with -m64 -O2, this
int f (long val)
{
int i;
if (val < 0)
i = -1;
else
for (i = 0; i < 64; i++)
if ((val <<= 1) < 0)
break;
return i;
}
is miscompiled to
sradi 3,3,63
ori 3,3,64
blr