From: Jim Wilson wil...@codesourcery.com
To: Jamie Prescott jpre...@yahoo.com
Cc: Georg-Johann Lay a...@gjlay.de; Ian Lance Taylor i...@google.com;
gcc@gcc.gnu.org
Sent: Tuesday, May 26, 2009 7:47:45 PM
Subject: Re: Seeking suggestion
Jamie Prescott wrote:
Is there a reason why
From: Jamie Prescott jpre...@yahoo.com
To: Jim Wilson wil...@codesourcery.com
Cc: Georg-Johann Lay a...@gjlay.de; Ian Lance Taylor i...@google.com;
gcc@gcc.gnu.org
Sent: Wednesday, May 27, 2009 10:12:42 AM
Subject: Re: Seeking suggestion
Thanks for the explanation. I somehow thought
Thanks for the explanation. I somehow thought that every insn spit out by a
define_insn was automatically turned into a parallel.
That's true, the template of a define_insn is automatically wrapped up in a
PARALLEL. But your addsi3 is a define_expand and this works differently.
--
Eric
From: Eric Botcazou ebotca...@adacore.com
To: Jamie Prescott jpre...@yahoo.com
Cc: gcc@gcc.gnu.org; Jim Wilson wil...@codesourcery.com; Georg-Johann Lay
a...@gjlay.de; Ian Lance Taylor i...@google.com
Sent: Wednesday, May 27, 2009 10:37:24 AM
Subject: Re: Seeking suggestion
Thanks
Jamie Prescott schrieb:
Thanks for the explanation. I somehow thought that every insn spit out by a
define_insn was automatically turned into a parallel.
That's true, the template of a define_insn is automatically wrapped up in a
PARALLEL. But your addsi3 is a define_expand and this works
From: Georg-Johann Lay a...@gjlay.de
To: Jamie Prescott jpre...@yahoo.com
Cc: Eric Botcazou ebotca...@adacore.com; gcc@gcc.gnu.org; Jim Wilson
wil...@codesourcery.com; Ian Lance Taylor i...@google.com
Sent: Wednesday, May 27, 2009 12:11:08 PM
Subject: Re: Seeking suggestion
Jamie
Jamie Prescott wrote:
Is there a reason why something like this would not work?
if (!TARGET_XXX2)
emit_clobber(gen_rtx_REG(CCmode, CC_REGNUM));
emit_insn(gen_addsi3_nc(operands[0], operands[1], operands[2]));
Yes. The optimizer will not know that addsi3_nc uses CC_REGNUM, as it
From: Michael Meissner meiss...@linux.vnet.ibm.com
To: Jamie Prescott jpre...@yahoo.com
Cc: gcc@gcc.gnu.org
Sent: Sunday, May 24, 2009 1:57:19 PM
Subject: Re: Seeking suggestion
One way is to use match_scratch, and different register classes for the two
cases.
(define_insn add3
Jamie Prescott schrieb:
Is there a reason why something like this would not work?
(define_insn addsi3_nc
[(set (match_operand:SI 0 fullreg_operand =r)
(plus:SI (match_operand:SI 1 fullreg_operand r)
(match_operand:SI 2 fullreg_or_imm_operand rn)))]
...
)
On Fri, May 22, 2009 at 05:04:22PM -0700, Jamie Prescott wrote:
From: Jamie Prescott jpre...@yahoo.com
To: gcc@gcc.gnu.org
Sent: Friday, May 22, 2009 10:36:47 AM
Subject: Seeking suggestion
Suppose you're writing the backend for a VM supporting two architectures,
in
which
Jamie Prescott schrieb:
Is the implementation I posted the only one, or there are shorter/better ones?
You could use insn attribute to express insns' effects on cc_status.
Have a look at the avr backend.
Georg-Johann
From: Georg-Johann Lay a...@gjlay.de
To: Jamie Prescott jpre...@yahoo.com
Cc: Ian Lance Taylor i...@google.com; gcc@gcc.gnu.org
Sent: Saturday, May 23, 2009 12:05:09 AM
Subject: Re: Seeking suggestion
Jamie Prescott schrieb:
Is the implementation I posted the only one
Suppose you're writing the backend for a VM supporting two architectures, in
which
one of them clobbers the CC registers for certain instructions, while the other
does not.
The instructions themselves are exactly the same.
What is the best/shortest/more-elegant way to write this, possibly w/out
From: Jamie Prescott jpre...@yahoo.com
To: gcc@gcc.gnu.org
Sent: Friday, May 22, 2009 10:36:47 AM
Subject: Seeking suggestion
Suppose you're writing the backend for a VM supporting two architectures, in
which
one of them clobbers the CC registers for certain instructions, while
Jamie Prescott jpre...@yahoo.com writes:
But now I get and invalid rtx sharing from the push/pop parallels:
This normally means that you need a copy_rtx somewhere. Different insns
may not share data structure.
Ian
From: Ian Lance Taylor i...@google.com
To: Jamie Prescott jpre...@yahoo.com
Cc: gcc@gcc.gnu.org
Sent: Friday, May 22, 2009 5:45:21 PM
Subject: Re: Seeking suggestion
Jamie Prescott writes:
But now I get and invalid rtx sharing from the push/pop parallels:
This normally means
16 matches
Mail list logo
