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Optimize duplicate zero_extend operations. 

* combine.c (force_to_mode, case LSHIFTRT): Add goto shiftrt.
	(force_to_mode, case ASHIFTRT): Add shiftrt label.

From-SVN: r28424
This commit is contained in:
Jim Wilson 1999-08-02 23:53:14 +00:00 committed by Jim Wilson
parent a47f48d8fc
commit fae2db4744
2 changed files with 10 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Mon Aug 2 16:27:42 1999 Jim Wilson <wilson@cygnus.com>
* combine.c (force_to_mode, case LSHIFTRT): Add goto shiftrt.
(force_to_mode, case ASHIFTRT): Add shiftrt label.
Tue Aug 3 00:45:02 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (strength_reduce): When doing biv->giv conversion, update

7
gcc/combine.c
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@ -6574,7 +6574,8 @@ force_to_mode (x, mode, mask, reg, just_select)
x = gen_binary (LSHIFTRT, GET_MODE (x), XEXP (x, 0),
GEN_INT (GET_MODE_BITSIZE (GET_MODE (x))
- exact_log2 (mask + 1)));
break;
goto shiftrt;
case ASHIFTRT:
/* If we are just looking for the sign bit, we don't need this shift at
@ -6639,7 +6640,9 @@ force_to_mode (x, mode, mask, reg, just_select)
if (mask == 1)
x = gen_binary (LSHIFTRT, GET_MODE (x), XEXP (x, 0), XEXP (x, 1));
/* If this is a sign-extension operation that just affects bits
shiftrt:
/* If this is a zero- or sign-extension operation that just affects bits
we don't care about, remove it. Be sure the call above returned
something that is still a shift. */