On Mon, Jun 20, 2011 at 09:38:22PM +0200, Bernd Schmidt wrote:
D'oh. Blackfin has a (clrsb:HI (operand:SI)) instruction, so adding this
showed a problem with some of the existing simplify_const_unop cases:
for ffs/clz/ctz/clrsb/parity/popcount, we should look at the mode of the
operand, rather
On 08/23/11 11:05, Jakub Jelinek wrote:
On Mon, Jun 20, 2011 at 09:38:22PM +0200, Bernd Schmidt wrote:
D'oh. Blackfin has a (clrsb:HI (operand:SI)) instruction, so adding this
showed a problem with some of the existing simplify_const_unop cases:
for ffs/clz/ctz/clrsb/parity/popcount, we should
On Tue, Aug 23, 2011 at 11:35 AM, Bernd Schmidt ber...@codesourcery.com wrote:
On 08/23/11 11:05, Jakub Jelinek wrote:
On Mon, Jun 20, 2011 at 09:38:22PM +0200, Bernd Schmidt wrote:
D'oh. Blackfin has a (clrsb:HI (operand:SI)) instruction, so adding this
showed a problem with some of the
On Tue, Aug 23, 2011 at 11:35:07AM +0200, Bernd Schmidt wrote:
cse_process_notes_1
perhaps could be changed for VOIDmode new_rtx to try to
simplify_replace_rtx it...
Is this where the problem came from? Sounds like it's worth a try.
In this case, yes. But there are many other places all
On 08/23/11 11:52, Jakub Jelinek wrote:
On Tue, Aug 23, 2011 at 11:35:07AM +0200, Bernd Schmidt wrote:
cse_process_notes_1
perhaps could be changed for VOIDmode new_rtx to try to
simplify_replace_rtx it...
Is this where the problem came from? Sounds like it's worth a try.
In this case,
Bernd Schmidt ber...@codesourcery.com writes:
Wasn't Richard S. working on a patch to give constants modes?
A whole series more like. Don't hold your breath!
Richard
On Mon, 20 Jun 2011, Bernd Schmidt wrote:
New patch below. Retested on i686 and bfin.
Yay, bikeshedding opportunity! :P
Can we call them leading *repeated* sign bits? (in docs and
comments) Calling them redundant makes you think the
representation is not two's complement but new and
On Mon, Jun 20, 2011 at 12:38 PM, Bernd Schmidt ber...@codesourcery.com wrote:
On 06/16/2011 06:25 PM, Richard Henderson wrote:
On 06/16/2011 05:44 AM, Bernd Schmidt wrote:
+@deftypefn {Built-in Function} int __builtin_clrsb (unsigned int x)
+Returns the number of leading redundant sign bits
On 06/20/2011 12:38 PM, Bernd Schmidt wrote:
D'oh. Blackfin has a (clrsb:HI (operand:SI)) instruction, so adding this
showed a problem with some of the existing simplify_const_unop cases:
for ffs/clz/ctz/clrsb/parity/popcount, we should look at the mode of the
operand, rather than the mode of
Bernd Schmidt schrieb:
Several processors have a count redundant sign bits instruction:
* SIGNBITS on Blackfin
* NORM on C6X
* SBC, apparently, on picochip
and probably others. For example, for a value of 0 or -1, it returns 31,
while e.g. an input 0xc000 produces 1.
Other
On Thu, Jun 16, 2011 at 2:44 PM, Bernd Schmidt ber...@codesourcery.com wrote:
Several processors have a count redundant sign bits instruction:
* SIGNBITS on Blackfin
* NORM on C6X
* SBC, apparently, on picochip
picoChip defines __builtin_sbc. Wouldn't that make it redundant
with your
On 06/16/2011 03:10 PM, Laurent Desnogues wrote:
On Thu, Jun 16, 2011 at 2:44 PM, Bernd Schmidt ber...@codesourcery.com
wrote:
Several processors have a count redundant sign bits instruction:
* SIGNBITS on Blackfin
* NORM on C6X
* SBC, apparently, on picochip
picoChip defines
On 06/16/2011 05:44 AM, Bernd Schmidt wrote:
+@deftypefn {Built-in Function} int __builtin_clrsb (unsigned int x)
+Returns the number of leading redundant sign bits in @var{x}, starting
+at the most significant bit position.
+@end deftypefn
Do we want a signed argument, since we're talking
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