https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61608
Bug ID: 61608
Summary: [4.10 regression] FAIL: gcc.target/arm/epilog-1.c
scan-assembler tests
Product: gcc
Version: 4.10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jgreenhalgh at gcc dot gnu.org
Revision 211919 changes the position of the peephole2 pass causing a code-size
regression for ARM targets.
My compiler is configured with:
Target: arm-none-eabi
Configured with: /work/gcc-clean/src/gcc/configure --target=arm-none-eabi
--prefix=/work/gcc-clean/build-arm-none-eabi/install
--with-gmp=/work/gcc-clean/build-arm-none-eabi/host-tools
--with-mpfr=/work/gcc-clean/build-arm-none-eabi/host-tools
--with-mpc=/work/gcc-clean/build-arm-none-eabi/host-tools
--with-pkgversion=unknown --disable-shared --disable-nls --disable-threads
--disable-tls --enable-checking=yes --enable-languages=c,c++,fortran
--with-newlib --with-arch=armv8-a --with-float=hard
--with-fpu=crypto-neon-fp-armv8
Thread model: single
gcc version 4.10.0 20140624
---
Code generation Before:
foo:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
push {r4, lr}
ldr r4, .L6
ldr r4, [r4]
lsls r4, r4, #29
it mi
addmi r2, r2, #1
bl bar
movs r0, #0
pop {r4, pc}
.
---
Code generation After:
foo:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
push {r4, lr}
ldr r4, .L6
ldr r4, [r4]
tst r4, #4
it ne
addne r2, r2, #1
bl bar
movs r0, #0
pop {r4, pc}
---
The tst (immediate) instruction is a 4-byte thumb instruction, while lsls is a
2-byte thumb instruction.
