https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68123
Bug ID: 68123
Summary: GCC vector extension behaves funny with large vector
size
Product: gcc
Version: 4.8.3
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dxin at usc dot edu
Target Milestone: ---
Created attachment 36599
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36599&action=edit
test source file
It would complete unroll the loop and produces a huge assembly.
With -O3 the produced assembly is smaller, but compilation takes a lot longer
than no -O3.
I attached test source file.
With
CFLAGS=-std=gnu11 -O3 -mcpu=cortex-a9 -mfloat-abi=hard -mfpu=neon -fPIE -Wall
-S -fverbose-asm
it compiles to a 57K line assembly and takes about 2min to compile, on a XEON
1245v3 machine.
Tested on "GCC: (crosstool-NG linaro-1.13.1-4.8-2013.11 - Linaro GCC 2013.10)
4.8.3 20131111 (prerelease)"
