search for: predications

Hi, I'd like to understand the order in which patterns are searched during ISEL. In the example below, indices are searched in ascending order from 808 to 3305, then it goes back to 3259 and eventually it matches the wrong instruction. Why did go back from 3305 to 3259? In my XXXGenDAGISel.inc, I can see that the correct instruction is at index 3420 but it never got there. ISEL: Starting

Hi, I was wondering if LLVM supports predicates and conditional execution. Something like we have in IA64. There is a register class of predicates and then every instruction may be predicated by a register from this class. For example: cmp_less p, x, y // p is a predicate which gets the result of x < y p add x, x, 2 // if p then do the add instruction Is there support in LLVM to something

In our architecture (TCE) we have predicate registers, not flags. But our predicates work in a way that in the predicated instruction do not contain only the predicate register, but a predicate register and boolean value pair, the boolean value stating if the instruction is to be executed only if the register is true(normal behavior of predicate regs) or only if the predicate reg is

2011/5/24 Justin Holewinski <justin.holewinski at gmail.com>: > On Tue, May 24, 2011 at 3:02 AM, roy rosen <roy.1rosen at gmail.com> wrote: >> >> Hi, >> >> I was wondering if LLVM supports predicates and conditional execution. >> Something like we have in IA64. >> There is a register class of predicates and then every instruction may >> be

Hi all, I am working on a CGRA backend (something like a 2D VLIW), and we also absolutely need predication. I extended the IfConversion pass to allow it to be executed multiple times and to predicate already predicated code. This is necessary to predicate code with nested conditional statements. At this point, we support or, and, and conditional predicates (see Scott Mahlke's papers on this

Thank you. i understood how avx512 vector instructions are written in x86instravx512. i need to define my vector instructions so i wrote; def VMOV_256B_RM : I<0x6F, MRMSrcMem, (outs VR2048:$dst), (ins i32mem:$src), "vmov_256B_rm\t{$src, $dst|$dst, $src}", [(set VR2048:$dst, (v64i32 (scalar_to_vector (loadi32 addr:$src))))],

Thank you; i have changed as follows.is it fine now? def VADD_256B : I<0xFE, MRMDestReg, (outs VR2048:$dst), (ins VR2048:$src1, VR2048:$src2), "VADD_256B\t{$src, $dst|$dst, $src}", [(set VR2048:$dst, (add VR2048:$src1, VR2048:$src2))]]>; Also here i have changed class RI to I. Does it make any difference? On Sat, Jul 8, 2017 at 9:38 AM, Craig Topper

Hi, I am planning to generate code for a peculiar architecture with _no_ branch instructions (!), but with predicated loads and stores to memory. This means the architecture is not Turing complete, is going to waste a lot of computation, and any input program that can hope to get compiled for this architecture must have loops that can be fully unrolled, and all its functions must get fully

On Tue, May 24, 2011 at 8:35 AM, roy rosen <roy.1rosen at gmail.com> wrote: > 2011/5/24 Justin Holewinski <justin.holewinski at gmail.com>: > > On Tue, May 24, 2011 at 3:02 AM, roy rosen <roy.1rosen at gmail.com> wrote: > >> > >> Hi, > >> > >> I was wondering if LLVM supports predicates and conditional execution. > >>

Hello, I'm working on a compiler based on LLVM for a SIMD architecture that supports instruction predication. We would like to implement branching on this architecture using predication. As you know the LLVM-IR doesn't support instruction predication, so I'm not exactly sure on what is the best way to implement it. We came up with some ways to do it in LLVM: - Do not add any

On Wed, Oct 31, 2012 at 09:13:43PM +0100, Bjorn De Sutter wrote: > Hi all, > > I am working on a CGRA backend (something like a 2D VLIW), and we also absolutely need predication. I extended the IfConversion pass to allow it to be executed multiple times and to predicate already predicated code. This is necessary to predicate code with nested conditional statements. At this point, we

Thank You. I have seen the opcode is 8 bits and all the combinations are already used in llvm x86. Now what to do? On Sat, Jul 8, 2017 at 10:57 AM, Craig Topper <craig.topper at gmail.com> wrote: > Yes its an opcode conflict. You'll have to look through Intel documents > and find an unused opcode. I've only added instructions based on a real > spec so I don't know

On Tue, May 24, 2011 at 3:02 AM, roy rosen <roy.1rosen at gmail.com> wrote: > Hi, > > I was wondering if LLVM supports predicates and conditional execution. > Something like we have in IA64. > There is a register class of predicates and then every instruction may > be predicated by a register from this class. > For example: > > cmp_less p, x, y // p is a predicate

On 22 Oct 2012, at 18:10, <dag at cray.com> wrote: > None of your proposed solutions is ideal. We really should have > first-class predication in the IR. It's only going to get more > important. Perhaps I am missing something, but isn't a predicated instruction effectively an single-instruction version of an arithmetic operation followed by a select? As we can already

Hi, I've done work on predicated SIMD representations for LLVM. If you search through the archives, you may find my "applymask" proposal, which is an attempt at representing predication in a very comprehensive way. I've since stopped pushing the proposal in part because Larrabee's changing fortunes led to a decline of interest at the time, in part because the proposal

David Chisnall <David.Chisnall at cl.cam.ac.uk> writes: > Perhaps I am missing something, but isn't a predicated instruction > effectively an single-instruction version of an arithmetic operation > followed by a select? No, it is not. Among other things, predication is used to avoid traps. A vector select is an entirely different operation. > As we can already represent

Hi Marcello, I am sure I've seen some postings on the list concerning architectures that support predicated execution and how to map that to LLVM IR, I'm just not sure anymore when and who was involved :). I have implemented your first suggestion for targets that do not have predicated instructions (where control flow to data flow conversion with explicit maintaining of masks and

Assume an architecture that has multiple condition code registers, e.g., powerpc. Now assume that there are predicate instructions like thumb2, but can specify which condition code register they refer to. Now also assume that these predicate instructions themselves are predicatible, if executed they change the current predication state. Can LLVM handle multiple levels of predication? When is

On Oct 7, 2007, at 12:51 AM, Nikhil A. Patil wrote: > Hi, > > I am planning to generate code for a peculiar architecture with > _no_ branch instructions (!), but with predicated loads and stores > to memory. This means the architecture is not Turing complete, is > going to waste a lot of computation, and any input program that can > hope to get compiled for this

On May 24, 2011, at 12:02 AM, roy rosen wrote: > Hi, > > I was wondering if LLVM supports predicates and conditional execution. > Something like we have in IA64. > There is a register class of predicates and then every instruction may > be predicated by a register from this class. > For example: > > cmp_less p, x, y // p is a predicate which gets the result of x <