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combine.c (force_to_mode): Use gen_int_mode. 

* combine.c (force_to_mode): Use gen_int_mode.
	Don't clear CONST_INT bits outside of mode.

	* gcc.dg/20020517-1.c: New test.

From-SVN: r53750
This commit is contained in:
Jakub Jelinek 2002-05-22 23:35:56 +02:00 committed by Jakub Jelinek
parent 8dc02d7f19
commit 2dd36f90d8
4 changed files with 38 additions and 20 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-05-22 Jakub Jelinek <jakub@redhat.com>
* combine.c (force_to_mode): Use gen_int_mode.
Don't clear CONST_INT bits outside of mode.
2002-05-22 Richard Henderson <rth@redhat.com>
* fixinc/inclhack.def (thread_keyword): Match __thread as last arg.

21
gcc/combine.c
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@ -6703,18 +6703,7 @@ force_to_mode (x, mode, mask, reg, just_select)
/* If X is a CONST_INT, return a new one. Do this here since the
test below will fail. */
if (GET_CODE (x) == CONST_INT)
{
HOST_WIDE_INT cval = INTVAL (x) & mask;
int width = GET_MODE_BITSIZE (mode);
/* If MODE is narrower that HOST_WIDE_INT and CVAL is a negative
number, sign extend it. */
if (width > 0 && width < HOST_BITS_PER_WIDE_INT
&& (cval & ((HOST_WIDE_INT) 1 << (width - 1))) != 0)
cval |= (HOST_WIDE_INT) -1 << width;
return GEN_INT (cval);
}
return gen_int_mode (INTVAL (x) & mask, mode);
/* If X is narrower than MODE and we want all the bits in X's mode, just
get X in the proper mode. */
@ -6920,14 +6909,6 @@ force_to_mode (x, mode, mask, reg, just_select)
force_to_mode (XEXP (x, 1), mode, mask,
reg, next_select));
/* If OP1 is a CONST_INT and X is an IOR or XOR, clear bits outside
MASK since OP1 might have been sign-extended but we never want
to turn on extra bits, since combine might have previously relied
on them being off. */
if (GET_CODE (op1) == CONST_INT && (code == IOR || code == XOR)
&& (INTVAL (op1) & mask) != 0)
op1 = GEN_INT (INTVAL (op1) & mask);
if (op_mode != GET_MODE (x) || op0 != XEXP (x, 0) || op1 != XEXP (x, 1))
x = gen_binary (code, op_mode, op0, op1);
break;

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2002-05-22 Jakub Jelinek <jakub@redhat.com>
* gcc.dg/20020517-1.c: New test.
2002-05-21 Richard Henderson <rth@redhat.com>
* gcc.dg/tls/tls.exp, gcc.dg/tls/trivial.c, gcc.dg/tls/diag-1.c,

28
gcc/testsuite/gcc.dg/20020517-1.c Normal file
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@ -0,0 +1,28 @@
/* This testcase caused ICE in do_SUBST on IA-32, because 0xf6 constant
was not sign-extended for QImode. */
/* { dg-do run } */
/* { dg-options "-O2" } */
/* { dg-options "-O2 -mcpu=i686" { target i?86-*-* } } */
#include <limits.h>
void abort (void);
void exit (int);
void foo (void)
{
int i;
char *p;
p = (char *) &i;
*p = -10;
if (* (unsigned char *) p != 0x100 - 10)
abort ();
}
int main (void)
{
if (UCHAR_MAX == 255)
foo ();
exit (0);
}