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(simplify_relation_operation): We can compute the result of a comparison of... 

(simplify_relation_operation): We can compute the result of a
comparison of CONST_INTs no matter what mode the computation is to be
done in.

From-SVN: r3372
This commit is contained in:
Richard Kenner 1993-01-27 19:23:36 -05:00
parent c2615a67c7
commit 02b8f30077
1 changed files with 6 additions and 2 deletions
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8
gcc/cse.c
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@ -4051,8 +4051,12 @@ simplify_relational_operation (code, mode, op0, op1)
if (GET_CODE (op0) == COMPARE && op1 == const0_rtx)
op1 = XEXP (op0, 1), op0 = XEXP (op0, 0);
if (GET_CODE (op0) != CONST_INT || GET_CODE (op1) != CONST_INT
|| width > HOST_BITS_PER_WIDE_INT || width == 0)
/* Unlike the arithmetic operations, we can do the comparison whether
or not WIDTH is larger than HOST_BITS_PER_WIDE_INT because the
CONST_INTs are to be understood as being infinite precision as
is the comparison. So there is no question of overflow. */
if (GET_CODE (op0) != CONST_INT || GET_CODE (op1) != CONST_INT || width == 0)
{
/* Even if we can't compute a constant result,
there are some cases worth simplifying. */