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(range_test): Don't convert hi_cst or lo_cst to unsigned when folding 

signed range tests.

From-SVN: r11768
This commit is contained in:
Richard Kenner 1996-04-14 18:49:18 -04:00
parent 84c7be4b21
commit 700ad580a6
1 changed files with 14 additions and 8 deletions
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22
gcc/fold-const.c
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@ -2617,15 +2617,21 @@ range_test (jcode, type, lo_code, hi_code, var, lo_cst, hi_cst)
if (! TREE_UNSIGNED (utype))
{
utype = unsigned_type (utype);
var = convert (utype, var);
lo_cst = convert (utype, lo_cst);
hi_cst = convert (utype, hi_cst);
return fold (convert (type,
build (rcode, utype,
convert (utype,
build (MINUS_EXPR, TREE_TYPE (var),
var, lo_cst)),
convert (utype,
const_binop (MINUS_EXPR, hi_cst,
lo_cst, 0)))));
}
return fold (convert (type,
build (rcode, utype,
build (MINUS_EXPR, utype, var, lo_cst),
const_binop (MINUS_EXPR, hi_cst, lo_cst, 0))));
else
return fold (convert (type,
build (rcode, utype,
build (MINUS_EXPR, utype, var, lo_cst),
const_binop (MINUS_EXPR, hi_cst,
lo_cst, 0))));
}
/* Subroutine for fold_truthop: C is an INTEGER_CST interpreted as a P