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cse.c (simplify_relational_operation): If MODE specifies a mode wider than HOST_WIDE_INT...

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* cse.c (simplify_relational_operation): If MODE specifies a
        mode wider than HOST_WIDE_INT, then the high word of a CONST_INT
        is derived from the sign bit of the low word.

Brought over from r5900 branch.

From-SVN: r15454
This commit is contained in:
Jeffrey A Law 1997-09-15 21:37:39 +00:00 committed by Jeff Law
parent dcb9d1f061
commit 05ef889761
2 changed files with 22 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Mon Sep 15 15:39:26 1997 Jeffrey A Law (law@cygnus.com)
* cse.c (simplify_relational_operation): If MODE specifies a
mode wider than HOST_WIDE_INT, then the high word of a CONST_INT
is derived from the sign bit of the low word.
1997-09-15 Brendan Kehoe <brendan@cygnus.com>
* except.c (find_exception_handler_labels): Use xmalloc instead of

18
gcc/cse.c
View File

@ -4482,7 +4482,14 @@ simplify_relational_operation (code, mode, op0, op1)
else
{
l0u = l0s = INTVAL (op0);
h0u = 0, h0s = l0s < 0 ? -1 : 0;
h0s = l0s < 0 ? -1 : 0;
/* If WIDTH is nonzero and larger than HOST_BITS_PER_WIDE_INT,
then the high word is derived from the sign bit of the low
word, else the high word is zero. */
if (width != 0 && width > HOST_BITS_PER_WIDE_INT)
h0u = l0s < 0 ? -1 : 0;
else
h0u = 0;
}
if (GET_CODE (op1) == CONST_DOUBLE)
@ -4493,7 +4500,14 @@ simplify_relational_operation (code, mode, op0, op1)
else
{
l1u = l1s = INTVAL (op1);
h1u = 0, h1s = l1s < 0 ? -1 : 0;
h1s = l1s < 0 ? -1 : 0;
/* If WIDTH is nonzero and larger than HOST_BITS_PER_WIDE_INT,
then the high word is derived from the sign bit of the low
word, else the high word is zero. */
if (width != 0 && width > HOST_BITS_PER_WIDE_INT)
h1u = l1s < 0 ? -1 : 0;
else
h1u = 0;
}
/* If WIDTH is nonzero and smaller than HOST_BITS_PER_WIDE_INT,