https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111558
Bug ID: 111558
Summary: RISCV: shrink-wrapper optimization question
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: alexey.lapshin at espressif dot com
CC: manolis.tsamis at vrull dot eu
Target Milestone: ---
Created attachment 55977
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55977&action=edit
shrink-synthetic-example.c
When I was studying shrink-wrapping behavior, I discovered something strange
code generation.
See the code and assembly at https://godbolt.org/z/P3WfTszYn
Every branch has the same save/restore callee-saved registers.
Therefore, the shrink-wrapping optimization may reduce the speed of the
function when input parameters are not zero...
I understand that this is not a synthetic code snippet...
But may this code generation be reproduced in real code (without asm inlining)?
