https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79144
Bug ID: 79144
Summary: cmpstrsi optimization breaks glibc
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: amodra at gmail dot com
Target Milestone: ---
Created attachment 40541
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40541&action=edit
strncmp testcase
glibc built with current gcc fails elf/check-localplt due to strcmp and strncmp
appearing in the PLT, when -mcpu=power6 or above. strncmp emitted by
rs6000.c:expand_strn_compare ought to use the asm alias __GI_strncmp given in
the attached testcase. For example, as it does when compiled with -O2 -m32
-mcpu=power5, producing:
foo:
lis 4,.LC0@ha
li 5,6
la 4,.LC0@l(4)
b __GI_strncmp
