Request for reviews (XL): 7119644: Increase superword's vector size up to 256 bits

[Christian Thalinger]

On Jun 2, 2012, at 8:19 PM, Vladimir Kozlov wrote:

> Most changes after latest Tom's review were done in superword.cpp and added regression tests. I think I nailed down latest issues I had with superword code. The changes pass all testing I did. Please, review it (same web link).

src/cpu/sparc/vm/sparc.ad:

It seems Repl8B_reg_helper (and probably the other helpers too) are only used once and so is enc_repl8b.  Can't we just move the code into the instruct itself using the MacroAssembler?  But I guess you want to keep this change small given it's already big.

src/cpu/x86/vm/x86.ad:

+ reg_def XMM0 ( SOC, SOC, Op_RegF, 0, xmm0->as_VMReg());
+ reg_def XMM0b( SOC, SOC, Op_RegF, 0, xmm0->as_VMReg()->next());
+ reg_def XMM0c( SOC, SOC, Op_RegF, 0, xmm0->as_VMReg()->next()->next());
+ reg_def XMM0d( SOC, SOC, Op_RegF, 0, xmm0->as_VMReg()->next()->next()->next());
+ reg_def XMM0e( SOC, SOC, Op_RegF, 0, xmm0->as_VMReg()->next()->next()->next()->next());
+ reg_def XMM0f( SOC, SOC, Op_RegF, 0, xmm0->as_VMReg()->next()->next()->next()->next()->next());
+ reg_def XMM0g( SOC, SOC, Op_RegF, 0, xmm0->as_VMReg()->next()->next()->next()->next()->next()->next());
+ reg_def XMM0h( SOC, SOC, Op_RegF, 0, xmm0->as_VMReg()->next()->next()->next()->next()->next()->next()->next());

Maybe we should use a macro for this block instead of replicating it 16 times.

src/share/vm/opto/superword.cpp:

 276       // Second, removed already constructed packs of the same type.

Typo "removed".

+     // Reconect loads back to upper_insert_pt.

Typo.

I didn't check all the tests but I guess they are okay.

About Op_Vec names, how about using the bit size as suffix:  Op_Vec32, Op_Vec64, Op_Vec128, Op_Vec256?  Because most of the time when we speak about vectors it's about bit sizes like "7119644: Increase superword's vector size up to 256 bits".

-- Chris

> 
> Thanks,
> Vladimir
> 
> On 4/3/12 10:03 AM, Vladimir Kozlov wrote:
>> http://cr.openjdk.java.net/~kvn/7119644/webrev
>> 
>> 7119644: Increase superword's vector size up to 256 bits
>> 
>> Increase superword's vector size up to 256-bits for YMM AVX registers on x86. Added generation of different vector sizes
>> for different types of arrays in the same loop. Allow to generate small (4 bytes) vectors for loops which were unrolled
>> small number of iterations.
>> Add new C2 types for vectors and rework VectorNode implementation. Used MachTypeNode as base node for vector mach nodes
>> to keep vector type.
>> Moved XMM registers definition and vector instructions into one file x86.ad (have to rename eRegI to rRegI in x86_32.ad).
>> 
>> Tested with full CTW, NSK, C2 regression tests, JPRT and added new test.
>> 
>> Thanks,
>> Vladimir