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(simplify_unary_operation): If operand mode is VOIDmode for 

UNSIGNED_FLOAT and operand looks negative, can't simplify.

From-SVN: r9081
This commit is contained in:
Richard Kenner 1995-02-25 06:55:11 -05:00
parent 7a96832ab0
commit a9c6464d87
1 changed files with 8 additions and 1 deletions
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9
gcc/cse.c
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@ -2972,7 +2972,14 @@ simplify_unary_operation (code, mode, op, op_mode)
else
lv = CONST_DOUBLE_LOW (op), hv = CONST_DOUBLE_HIGH (op);
if (GET_MODE_BITSIZE (op_mode) >= HOST_BITS_PER_WIDE_INT * 2)
if (op_mode == VOIDmode)
{
/* We don't know how to interpret negative-looking numbers in
this case, so don't try to fold those. */
if (hv < 0)
return 0;
}
else if (GET_MODE_BITSIZE (op_mode) >= HOST_BITS_PER_WIDE_INT * 2)
;
else
hv = 0, lv &= GET_MODE_MASK (op_mode);