https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117933
Bug ID: 117933
Summary: [lra][avr] Increased code size / stack usage with
-mlra
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gjl at gcc dot gnu.org
Target Milestone: ---
Created attachment 59802
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59802&action=edit
u32-to-string.c: C test case
$ avr-gcc-15 -c -o x-v0.o u32-to-string.c -save-temps=obj -mmcu=atmega128 -Os
$ avr-gcc-15 -c -o x-v1.o u32-to-string.c -save-temps=obj -mmcu=atmega128 -Os
-mlra
$ avr-size x-v0.o
text data bss dec hex filename
120 0 0 120 78 x-v0.o
$ avr-size x-v1.o
text data bss dec hex filename
138 0 0 138 8a x-v1.o
The prologue in either case is reading:
u32_to_string: ; with -mno-lra (x-v0.s)
push r16
push r17
push r28
/* prologue: function */
/* frame size = 0 */
/* stack size = 3 */
.L__stack_usage = 3
u32_to_string: ; with -mlra (x-v1.s)
push r12
push r13
push r14
push r15
push r17
push r28
push r29
/* prologue: function */
/* frame size = 0 */
/* stack size = 7 */
.L__stack_usage = 7
