RFR: 8302908: RISC-V: Support vector add mask instructions for Vector API

[Dingli Zhang]

HI,

We have added support for vector add mask instructions, please take a look and have some reviews. Thanks a lot.

This patch will add support of `VectorLoadMask`, `AddVB`, `AddVS`, `AddVI`, `AddVL`, `AddVF`, `AddVD` for RISC-V and was implemented by referring to RVV v1.0 [1].

`VectorLoadMask` will generate the corresponding mask vector for the vector addition operation in mask form.

AddMaskTestMerge case:


import jdk.incubator.vector.IntVector;
import jdk.incubator.vector.VectorMask;
import jdk.incubator.vector.VectorOperators;
import jdk.incubator.vector.VectorSpecies;

public class AddMaskTestMerge {

    static final VectorSpecies<Integer> SPECIES = IntVector.SPECIES_128;
    static final int SIZE = 1024;
    static int[] a = new int[SIZE];
    static int[] b = new int[SIZE];
    static int[] r = new int[SIZE];
    static boolean[] c = new boolean[]{true,false,true,false,true,false,true,false};
    static {
        for (int i = 0; i < SIZE; i++) {
            a[i] = i;
            b[i] = i;
        }
    }

    static void workload(int idx) {
        VectorMask<Integer> vmask = VectorMask.fromArray(SPECIES, c, 0);
        IntVector av = IntVector.fromArray(SPECIES, a, idx);
        IntVector bv = IntVector.fromArray(SPECIES, b, idx);
        av.lanewise(VectorOperators.ADD, bv, vmask).intoArray(r, idx);
    }

    public static void main(String[] args) {
        for (int i = 0; i < 30_0000; i++) {
            for (int j = 0; j < SIZE; j += SPECIES.length()) {
                workload(j);
            }
        }
    }
}


This test cases are reduced from existing jtreg vector tests Int128VectorTests.java [2].

Before this patch, the compilation log will not print RVV-related instructions. Now the compilation log is as follows:


0ae     B10: #	out( B25 B11 ) <- in( B9 )  Freq: 0.999991
0ae     loadV V1, [R31]	# vector (rvv)
0b6     vloadmask V0, V2	# KILL cr
0be     vadd.vv V3, V1, V0	#@vaddI_masked
0c6     lwu  R28, [R7, #124]	# loadN, compressed ptr, #@loadN ! Field: AddMaskTestMerge.r
0ca     decode_heap_oop  R28, R28	#@decodeHeapOop
0cc     lwu  R7, [R28, #12]	# range, #@loadRange
0d0     NullCheck R28


And the jit code is as follows:


  0x000000400c8109ae:   vsetivli        t0,4,e32,m1,tu,mu
  0x000000400c8109b2:   vle32.v v1,(t6)                     ;*invokestatic store {reexecute=0 rethrow=0 return_oop=0}
                                                            ; - jdk.incubator.vector.IntVector::intoArray at 43 (line 3228)
                                                            ; - AddMaskTestMerge::workload at 46 (line 25)
  0x000000400c8109b6:   vsetivli        t0,4,e8,m1,tu,mu
  0x000000400c8109ba:   vmsne.vx        v0,v2,zero          ;*invokestatic load {reexecute=0 rethrow=0 return_oop=0}
                                                            ; - jdk.incubator.vector.VectorMask::fromArray at 47 (line 208)
                                                            ; - AddMaskTestMerge::workload at 7 (line 22)
  0x000000400c8109be:   vsetivli        t0,4,e32,m1,tu,mu
  0x000000400c8109c2:   vadd.vv v3,v3,v1,v0.t               ;*invokestatic binaryOp {reexecute=0 rethrow=0 return_oop=0}
                                                            ; - jdk.incubator.vector.IntVector::lanewiseTemplate at 192 (line 834)
                                                            ; - jdk.incubator.vector.Int128Vector::lanewise at 9 (line 291)
                                                            ; - jdk.incubator.vector.Int128Vector::lanewise at 4 (line 41)
                                                            ; - AddMaskTestMerge::workload at 39 (line 25)




[1] https://github.com/riscv/riscv-v-spec/blob/v1.0/v-spec.adoc
[2] https://github.com/openjdk/jdk/blob/master/test/jdk/jdk/incubator/vector/Int128VectorTests.java

### Testing:

qemu with UseRVV:
- [x] Tier1 tests (release)
- [x] Tier2 tests (release)
- [x] Tier3 tests (release)
- [x] test/jdk/jdk/incubator/vector (release/fastdebug)

Unmatched:
- [x] Tier1 tests (release)
- [ ] Tier2 tests (release)

-------------

Commit messages:
 - RISC-V: Support vector add mask instructions for Vector API

Changes: https://git.openjdk.org/jdk/pull/12682/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12682&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302908
  Stats: 122 lines in 3 files changed: 116 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/12682.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12682/head:pull/12682

PR: https://git.openjdk.org/jdk/pull/12682