https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97367
Bug ID: 97367
Summary: powerpc64 g5 and cell optimizations result in .machine
power7
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rene at exactcode dot de
Target Milestone: ---
Created attachment 49341
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49341&action=edit
Patch
Since reworking the rs6000 .machine output selection in commit
e154242724b084380e3221df7c08fcdbd8460674 22 May 2019, compiling glibc with
either G5 or cell results in power7 assembly optimizations to be chosen, which
obviously crash with illegal instructions. This is because gcc's .machine
output was accidentally changed due to OPTION_MASK_ALTIVEC only otherwise
present in IBM CPUs since power7.
powerpc64-t2-linux-gnu-gcc test.c -S -o - -mcpu=G5
.file "test.c"
.machine power7
.abiversion 2
.section ".text"
.ident "GCC: (GNU) 10.2.0"
.section .note.GNU-stack,"",@progbits
Attached patch fixes this to filter out ALTIVEC just like GFXOPT and GPOPT.
