[LLVMdev] Using patterns inside patterns

[Villmow, Micah]

I do not have access to a subtraction routine, as it is considered add
with negation on the second parameter, so I have this pattern:

// integer subtraction

// a - b ==> a + (-b)

def ISUB : Pat<(sub GPRI32:$src0, GPRI32:$src1),

               (IADD GPRI32:$src0, (INEGATE GPRI32:$src1))>;

 

I am attemping to do 64 bit integer shifts and using the following
pattern:

def LSHL : Pat<(shl GPRI64:$src0, GPRI32:$src1),

        (LCREATE (ISHL (LLO GPRI64:$src0), GPRI32:$src1), 

         (IOR (ISHL (LHI GPRI64:$src0), GPRI32:$src1), (IOR (USHR (LLO
GPRI64:$src0), (IADD (LOADCONST_i32 32), (INEGATE GPRI32:$src1))), (USHR
(LLO GPRI64:$src0), (IADD GPRI32:$src1, (LOADCONST_i32 -32))))))>;

 

However, I have two adds that I could map to subtractions, what I would
like to be able to do is:

 

def LSHL : Pat<(shl GPRI64:$src0, GPRI32:$src1),

        (LCREATE (ISHL (LLO GPRI64:$src0), GPRI32:$src1), 

         (IOR (ISHL (LHI GPRI64:$src0), GPRI32:$src1), (IOR (USHR (LLO
GPRI64:$src0), (ISUB (LOADCONST_i32 32), GPRI32:$src1)), (USHR (LLO
GPRI64:$src0), (ISUB GPRI32:$src1, (LOADCONST_i32 32))))))>;

 

However my error is:

In LSHL: Unrecognized node 'ISUB'!

 

So, it obviously wants SDNodes and not Pat's, so is there a way I can
align this to get it so it will accept a Pat or to translate a Pat as an
SDNode?

 

________________________________

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
On Behalf Of Evan Cheng
Sent: Thursday, October 30, 2008 8:44 AM
To: LLVM Developers Mailing List
Subject: Re: [LLVMdev] Using patterns inside patterns

 

I am not sure what you are looking to do. Please provide a mark up
example. 

 

Evan

 

On Oct 28, 2008, at 11:00 AM, Villmow, Micah wrote:





Is there currently a way to use a pattern inside of another pattern?

 

Micah Villmow

Systems Engineer

Advanced Technology & Performance

Advanced Micro Devices Inc.

4555 Great America Pkwy,

Santa Clara, CA. 95054

P: 408-572-6219

F: 408-572-6596

 

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