[llvm] [RISCV] Reduce the LMUL for a vrgather operation if legal (PR #125768)

[Philip Reames via llvm-commits]

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@@ -874,27 +874,30 @@ define <16 x i8> @reverse_v16i8_2(<8 x i8> %a, <8 x i8> %b) {
 define <32 x i8> @reverse_v32i8_2(<16 x i8> %a, <16 x i8> %b) {
 ; CHECK-LABEL: reverse_v32i8_2:
 ; CHECK:       # %bb.0:
-; CHECK-NEXT:    vsetvli a0, zero, e16, m2, ta, ma
-; CHECK-NEXT:    vmv1r.v v10, v9
 ; CHECK-NEXT:    csrr a0, vlenb
-; CHECK-NEXT:    vid.v v12
+; CHECK-NEXT:    vsetvli a1, zero, e16, m2, ta, ma
+; CHECK-NEXT:    vid.v v10
 ; CHECK-NEXT:    addi a1, a0, -1
-; CHECK-NEXT:    vrsub.vx v12, v12, a1
+; CHECK-NEXT:    vrsub.vx v10, v10, a1
 ; CHECK-NEXT:    lui a1, 16
 ; CHECK-NEXT:    addi a1, a1, -1
 ; CHECK-NEXT:    vsetvli zero, zero, e8, m1, ta, ma
-; CHECK-NEXT:    vrgatherei16.vv v15, v8, v12
-; CHECK-NEXT:    vrgatherei16.vv v14, v9, v12
+; CHECK-NEXT:    vrgatherei16.vv v15, v8, v10
+; CHECK-NEXT:    vrgatherei16.vv v14, v12, v10
 ; CHECK-NEXT:    vsetvli zero, zero, e32, m4, ta, ma
 ; CHECK-NEXT:    vmv.s.x v0, a1
 ; CHECK-NEXT:    li a1, 32
-; CHECK-NEXT:    slli a0, a0, 1
-; CHECK-NEXT:    vsetvli zero, a1, e8, m2, ta, mu
+; CHECK-NEXT:    vsetivli zero, 16, e8, m1, ta, ma
 ; CHECK-NEXT:    vid.v v8
+; CHECK-NEXT:    slli a0, a0, 1
+; CHECK-NEXT:    vrsub.vi v8, v8, 15
 ; CHECK-NEXT:    addi a0, a0, -32
-; CHECK-NEXT:    vrsub.vi v12, v8, 15
-; CHECK-NEXT:    vslidedown.vx v8, v14, a0
-; CHECK-NEXT:    vrgather.vv v8, v10, v12, v0.t
+; CHECK-NEXT:    vsetvli zero, a1, e8, m2, ta, ma
+; CHECK-NEXT:    vslidedown.vx v10, v14, a0
+; CHECK-NEXT:    vsetivli zero, 16, e8, m1, ta, ma
+; CHECK-NEXT:    vrgather.vv v12, v9, v8
+; CHECK-NEXT:    vsetvli zero, a1, e8, m2, ta, ma
+; CHECK-NEXT:    vmerge.vvm v8, v10, v12, v0
 ; CHECK-NEXT:    ret
   %res = shufflevector <16 x i8> %a, <16 x i8> %b,  <32 x i32> <i32 31, i32 30, i32 29, i32 28, i32 27, i32 26, i32 25, i32 24, i32 23, i32 22, i32 21, i32 20, i32 19, i32 18, i32 17, i32 16, i32 15, i32 14, i32 13, i32 12, i32 11, i32 10, i32 9, i32 8, i32 7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
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preames wrote:

Note that in general, the two sources are unrelated register groups.  So the concat is also an O(LMUL) operation.  Given that, the single source reverse mapping is in the same rough ballpark as the two independent reverse and merge form  

However, you are right there's something interesting here.  If I add the reverse case to isShuffleMaskLegal, I get a much improved lowering for these.  Specifically, we reverse each source and then concat.  

I'm going to post a separate patch for that, good catch.  

https://github.com/llvm/llvm-project/pull/125768