#!/bin/sh

# Compile regtest.c with the specified register name and invoke
# the resulting executable.

if [ $# -ne 1 ]; then
    echo "Usage: $(basename $0) register-name" 1>&2
    exit 1
fi

CFLAGS=
PIC_CFLAGS="${CFLAGS} -fpic"

echo Trying register "$1"...
if ../../scripts/mgnuc $CFLAGS "-DREG=\"$1\"" regtest.c regtest2.c -o /tmp/regtest$$ -lm &&
   [ -x /tmp/regtest$$ ] && /tmp/regtest$$
then
	if ../../scripts/mgnuc $PIC_CFLAGS "-DREG=\"$1\"" regtest.c regtest2.c \
		-o /tmp/regtest$$ -lm &&
	   [ -x /tmp/regtest$$ ] && /tmp/regtest$$
	then
		echo "Register $1 seems to work OK"
	else
		if ../../scripts/mgnuc -g $CFLAGS "-DREG=\"$1\"" -c regtest.c &&
		   ../../scripts/mgnuc -g $PIC_CFLAGS -c regtest2.c &&
		   ../../scripts/mgnuc -g regtest.o regtest2.o -o /tmp/regtest$$ -lm &&
		   [ -x /tmp/regtest$$ ] && /tmp/regtest$$
		then
			echo "Register $1 can't be used in PIC mode"
		else
			echo "Register $1 can't be used in PIC mode, and"
			echo "register $1 also gets clobbered when you merely call PIC code."
		fi
	fi
else
	echo "Register $1 can't be used"
fi
rm -f /tmp/regtest$$