* arithmetic standard pattern using only memory_operand
@ 2011-10-21 14:54 BELBACHIR Selim
2011-10-21 16:20 ` Richard Henderson
0 siblings, 1 reply; 2+ messages in thread
From: BELBACHIR Selim @ 2011-10-21 14:54 UTC (permalink / raw)
To: gcc
Hi,
My target has arithmetic instruction whose operands can ONLY be memory (offseted, post/pre inc, ...).
For example 'add' can only have a memory operand as its first operand :
add mem($C1), $C2, $C3
I tried to simply write the addsi3 pattern with using memory_operand as predicate for operand 2 but gcc often (always?) tries to use a register instead of memory and finally send the error message :
unrecognizable insn :
set (reg:SI 0) (plus:SI (reg SI 1) (reg SI 2))
Is it possible to define arithmetic standard parttern with operands matched by memory_operand only ? How ?
Maybe I forgot a important MACRO in may <target>.h ?
Regards,
Selim
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: arithmetic standard pattern using only memory_operand
2011-10-21 14:54 arithmetic standard pattern using only memory_operand BELBACHIR Selim
@ 2011-10-21 16:20 ` Richard Henderson
0 siblings, 0 replies; 2+ messages in thread
From: Richard Henderson @ 2011-10-21 16:20 UTC (permalink / raw)
To: BELBACHIR Selim; +Cc: gcc
On 10/21/2011 06:10 AM, BELBACHIR Selim wrote:
> Is it possible to define arithmetic standard parttern with operands matched by memory_operand only?
No.
r~
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-10-21 14:54 arithmetic standard pattern using only memory_operand BELBACHIR Selim
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