https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96993
Bug ID: 96993
Summary: invalid code
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jan.smets at nokia dot com
Target Milestone: ---
Created attachment 49203
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49203&action=edit
testcase
Following testcase produces invalid code in 10.1, 10.2. Works with 9.3.
%rdi is sometimes invalid in call to listReplaceEntry() (is 0x8)
(or if listReplaceEntry() would always return, it would crash on mov
0x18(%rbx),%rbx right before constructing %rdi for the call (%rbx is zero on
second loop iteration)
Adding simple code changes, like a asm("nop") before if (b_rep), makes it
produce working code.
Configured with: /usr/src/gcc/configure --build=x86_64-linux-gnu
--disable-multilib --enable-languages=c,c++,fortran,go
Compile testcase with -O2 [-fno-omit-frame-pointer]
