Run CSmith to compare compiler's output

CSmith itself causes,

  * with safe-math, infinite loop happens
  * without safe-math, divide by zero
  * undefined behavior:
    * right shift more than bit width

Author: tyfkda

tool/check-csmith.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+set -e
+
+INC_PATH="-I $CSMITH_PATH"
+
+CSMITH_OPT="
+    --max-funcs 3
+    --max-expr-complexity 3
+    --no-packed-struct
+    --no-safe-math
+    --no-jumps
+    "
+
+RUN_AOUT="./a.out"
+CC=gcc
+XCC=./xcc
+# RUN_AOUT="./tool/run-riscv64 ./a.out"
+# CC=riscv64-unknown-elf-gcc
+
+# wcc
+# RUN_AOUT="./tool/runwasi ./a.wasm"
+# CC="emcc -o a.wasm"
+# XCC="./wcc --stack-size=0x10000"
+
+for i in `seq 0 99`; do
+    echo "Test $i"
+
+    csmith $CSMITH_OPT > tmp.c
+    # csmith creates platform.info
+    rm -f platform.info
+
+    $XCC $INC_PATH tmp.c > /dev/null 2>&1
+    $RUN_AOUT > tmp_out.xcc.txt
+
+    $CC $INC_PATH tmp.c > /dev/null 2>&1
+    $RUN_AOUT > tmp_out.gcc.txt
+    diff tmp_out.xcc.txt tmp_out.gcc.txt
+done
+
+rm tmp_out.*
+echo "SUCCESS"