ptx-90-parser 0.2.0

Parse NVIDIA PTX 9.0 assembly into a structured AST and explore modules via a CLI.
Documentation 
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### Description

Two-way SIMD parallel comparison with secondary operation.
Elements of each dual half-word source to the operation are selected from any of the four half-words
in the two source operands a and b using the asel and bsel modifiers.
The selected half-words are then compared in parallel.
The intermediate result of the comparison is always unsigned, and therefore the half-words of
destination d and operand c are also unsigned.
For instructions with a secondary SIMD merge operation:
For instructions with a secondary accumulate operation:

### Syntax

```
// SIMD instruction with secondary SIMD merge operation
vset2.atype.btype.cmp  d{.mask}, a{.asel}, b{.bsel}, c;

// SIMD instruction with secondary accumulate operation
vset2.atype.btype.cmp.add  d{.mask}, a{.asel}, b{.bsel}, c;

.atype = .btype = { .u32, .s32 };
.cmp   = { .eq, .ne, .lt, .le, .gt, .ge };
.mask  = { .h0, .h1, .h10 };  // defaults to .h10
.asel  = .bsel  = { .hxy, where x,y are from { 0, 1, 2, 3 } };
   .asel defaults to .h10
   .bsel defaults to .h32
```

### Semantics

```
// extract pairs of half-words and sign- or zero-extend
// based on operand type
Va = extractAndSignExt_2( a, b, .asel, .atype );
Vb = extractAndSignExt_2( a, b, .bsel, .btype );
Vc = extractAndSignExt_2( c );
for (i=0; i<2; i++) {
    t[i] = compare( Va[i], Vb[i], .cmp ) ? 1 : 0;
}
// secondary accumulate or SIMD merge
mask = extractMaskBits( .mask );
if (.add) {
    d = c;
    for (i=0; i<2; i++) {  d += mask[i] ? t[i] : 0;  }
} else {
    d = 0;
    for (i=0; i<2; i++)  {  d |= mask[i] ? t[i] : Vc[i];  }
}
```

### Examples

```
vset2.s32.u32.lt      r1, r2, r3, r0;
vset2.u32.u32.ne.add  r1, r2, r3, r0;
```