20020720-1.x

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

# The following targets fail 20020720-1.c for several reasons:
# (1) They implement floating point instructions via software, or
# (2) The "abs(x) < 0.0" comparison is split up in too many intermediate
#     insns for combine to handle -- it can handle max three insns
#     simultaneously.  For example, for RISCy machines it is common that 1
#     insn performs abs, 1 insn loads 0.0, 1 insn sets CCmode flags based
#     upon the FP comparison, and a 4th insn makes a conditional branch
#     based upon the appropriate bits in the flags.  On the other hand, if
#     for example the comparison insn takes 0.0 as an operand, the
#     combiner is able to see all intermediate instructions simultaneously
#     and can make the optimization.

# Don't XFAIL at -O0, that should never fail.
set torture_eval_before_compile {
    global compiler_conditional_xfail_data
    set compiler_conditional_xfail_data {
        "This test fails to optimize completely on certain platforms." \
        { "xtensa-*-*" "sh-*-*" "arm*-*-*" "strongarm*-*-*" "xscale*-*-*" \
	  "h8300*-*-*" "x86_64-*-*" "cris-*-*" } \
        { "*" } \
        { "-O0" }
    }
}

return 0