Re: "-fno-unswitch-loops" option have no effect?

[ami_stuff <ami_stuff at o2 dot pl>]

Hi,

> Works fine for me.  gcc.dg/tree-ssa/loop-6.c is unswitched with -O3
> but not with -O3 -fno-unswitch-loops.

This one works for me too.

Could you try to compile "deflate.c" from libz?

Here are my results:

-m68060 -O3 -fno-unswitch-loops                                                            - 12,9kb
-m68060 -O3                                                                                - 12,9kb
-m68060 -O2 -finline-functions -fgcse-after-reload -ftree-vectorize -fpredictive-commoning - 12,4kb

but it's a lot more visible with "libavcodec/dsputil.c" from FFmpeg package:

OPTFLAGS= -mnobitfield -m68060 -std=c99  -Wdeclaration-after-statement -Wdisabled-optimization -fno-math-errno -D_ISOC99_SOURCE -D_POSIX_C_SOURCE=200112 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-common -fomit-frame-pointer -Wall -Wno-switch -Wpointer-arith -Wredundant-decls -Wcast-qual -Wwrite-strings -Wundef -O2 -finline-functions -fgcse-after-reload -ftree-vectorize -fpredictive-commoning:

306kb

OPTFLAGS= -mnobitfield -m68060 -std=c99  -Wdeclaration-after-statement -Wdisabled-optimization -fno-math-errno -D_ISOC99_SOURCE -D_POSIX_C_SOURCE=200112 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-common -fomit-frame-pointer -Wall -Wno-switch -Wpointer-arith -Wredundant-decls -Wcast-qual -Wwrite-strings -Wundef -O3 -fno-unswitch-loops:

1,18mb

OPTFLAGS= -mnobitfield -m68060 -std=c99  -Wdeclaration-after-statement -Wdisabled-optimization -fno-math-errno -D_ISOC99_SOURCE -D_POSIX_C_SOURCE=200112 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-common -fomit-frame-pointer -Wall -Wno-switch -Wpointer-arith -Wredundant-decls -Wcast-qual -Wwrite-strings -Wundef -O3

1,18mb

Regards