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ARM float ordering
- From: Daniel Jacobowitz <drow at mvista dot com>
- To: gcc at gcc dot gnu dot org
- Cc: nickc at redhat dot com
- Date: Fri, 20 Jun 2003 11:54:08 -0400
- Subject: ARM float ordering
I was looking at xscale-elf.h this morning, and noticed this:
#define SUBTARGET_EXTRA_ASM_SPEC "%{!mcpu=*:-mcpu=xscale} \
%{mhard-float:-mfpu=fpa} \
%{!mhard-float: %{msoft-float:-mfpu=softfpa;:-mfpu=softvfp}}"
This comes from:
revision 1.6 date: 2003/04/09 15:14:23; author: nickc; state: Exp; lines: +24 -1
* doc/install.texi: Note that ARM toolchains need binutils 2.13 or newer.
* config/arm/elf.h (SUBTARGET_ASM_FLOAT_SPEC): Pass -mfpu=softfpa instead of -mno-fpu.
* config/arm/semi.h (ASM_SPEC): Likewise.
* config/arm/xscale-elf.h (SUBTARGET_EXTRA_ASM_SPEC): Likewise,
but only if -msoft-float is specified pass. Otherwise pass -mfpu=softvfp.
So, if -mhard-float we specify -mfpu=fpa; for -msoft-float we specify
-mfpu=softfpa; and for neither we specify -mfpu=softvfp. However, nowhere
that I can find does this set a flag for the compiler. This never triggers
TARGET_VFP, so arm_float_words_big_endian will always be wrong for
little-endian Xscale with default options.
Am I missing something?
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer