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combine.c (expand_compound_operation): Fix thinko in code to optimize (zero_extend:DI (subreg:SI (foo:DI) 0)) to foo:DI.

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* combine.c (expand_compound_operation): Fix thinko in code to optimize
        (zero_extend:DI (subreg:SI (foo:DI) 0)) to foo:DI.

From-SVN: r20966
This commit is contained in:
Jeffrey A Law 1998-07-06 21:45:51 +00:00 • committed by Jeff Law
parent c6e9ab63a8
commit fcc60894b8
2 changed files with 4 additions and 1 deletions
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gcc/ChangeLog
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@ -21,6 +21,9 @@ Mon Jul 6 22:09:32 1998 Ian Lance Taylor <ian@cygnus.com>
Mon Jul 6 21:28:14 1998 Jeffrey A Law (law@cygnus.com)
* combine.c (expand_compound_operation): Fix thinko in code to optimize
(zero_extend:DI (subreg:SI (foo:DI) 0)) to foo:DI.
* Disable the following change from gcc2. Not appropriate for egcs:
Sun Jun 7 09:30:31 1998 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>

2
gcc/combine.c
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@ -5203,7 +5203,7 @@ expand_compound_operation (x)
&& subreg_lowpart_p (XEXP (x, 0))
&& GET_MODE_BITSIZE (GET_MODE (x)) <= HOST_BITS_PER_WIDE_INT
&& (nonzero_bits (SUBREG_REG (XEXP (x, 0)), GET_MODE (x))
& ~ GET_MODE_MASK (GET_MODE (SUBREG_REG (x)))) == 0)
& ~ GET_MODE_MASK (GET_MODE (XEXP (x, 0)))) == 0)
return SUBREG_REG (XEXP (x, 0));
/* (zero_extend:DI (truncate:SI foo:DI)) is just foo:DI when foo