#!/bin/bash

# This script is a helper to bisect GCC regressions.
# Inputs (as env. variables):
# EXP: name of .exp file to run
# TESTNAME: name of test to run
# GOOD
# BAD
# TARGET
# CPU
# FPU
# MODE
# SIMU
# TARGETBOARD: additional test flags

# Sample usage:
# EXP=advsimd-intrinsics.exp TESTNAME=vduph_lane.c TARGET=aarch64-linux-gnu GOOD=242941 BAD=242954 ./abe-bisect.sh

# Check if the variable NAME is set
check_set()
{
    name=$1
    eval val=\$${name}
    [ x$val = x ] && echo $1 not set && exit 1
}

check_set EXP
check_set TESTNAME
check_set GOOD
check_set BAD
check_set TARGET
#check_set CPU
#check_set FPU
#check_set MODE
#check_set SIMU
#check_set TARGETBOARD

rundir=`pwd -P`
mydir="$(dirname $0)"
cd "${mydir}"
mydir="$(pwd)"
cd ${rundir}

git clone http://git.linaro.org/toolchain/abe.git
ABE=${rundir}/abe
${ABE}/configure --with-git-reference-dir=/home/tcwg-buildslave/snapshots-ref

# Checkout GCC master
${ABE}/abe.sh --target $TARGET gcc=gcc.git~master --checkout all

cd snapshots/gcc.git~master

git bisect reset
git reset --hard
git bisect start --no-checkout

GOODSHA1=`git log --format=format:"%H" --grep=trunk@${GOOD} master`
BADSHA1=`git log --format=format:"%H" --grep=trunk@${BAD} master`

echo GOOD: $GOODSHA1
echo BAD: $BADSHA1

git bisect good ${GOODSHA1}
git bisect bad ${BADSHA1}

RUNDIR=${rundir} ABE=${ABE} EXP=${EXP} TESTNAME=${TESTNAME} TARGET=${TARGET} CPU=${CPU} FPU=${FPU} MODE=${MODE} SIMU=${SIMU} TARGETBOARD=${TARGETBOARD} git bisect run ${mydir}/abe-bisect-helper.sh