http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53071
Bug #: 53071
Summary: Wrong instruction replacement when compiling for xop
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: critical
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ag...@agner.org
Created attachment 27216
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27216
source code and asm output
An intrinsic vector multiply function is replaced by xop instructions when the
attached file is compiled with -mxop. Perhaps the compiler is trying to combine
a shift instruction and a multiply instruction into a single xop instruction,
but it ends up with something wrong.
This is perhaps related to bugs # 52908 and 52910.
