[llvm] [RISCV] Update TTI for llvm.experimental.cttz.elts (PR #214795)

[Pengcheng Wang via llvm-commits]

================
@@ -131,3 +131,47 @@ define void @foo_vscale_range_2_16() vscale_range(2,16) {
 
   ret void
 }
+
+
+define void @foo_fixed_len_vectors() {
+; CHECK-LABEL: 'foo_fixed_len_vectors'
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %res.i32.v2i1.false = call i32 @llvm.experimental.cttz.elts.i32.v2i1(<2 x i1> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %res.i32.v4i1.false = call i32 @llvm.experimental.cttz.elts.i32.v4i1(<4 x i1> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %res.i32.v8i1.false = call i32 @llvm.experimental.cttz.elts.i32.v8i1(<8 x i1> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %res.i32.v64i1.false = call i32 @llvm.experimental.cttz.elts.i32.v64i1(<64 x i1> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %res.i32.v128i1.false = call i32 @llvm.experimental.cttz.elts.i32.v128i1(<128 x i1> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 24 for instruction: %res.i32.v1024i1.false = call i32 @llvm.experimental.cttz.elts.i32.v1024i1(<1024 x i1> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 48 for instruction: %res.i32.v2048i1.false = call i32 @llvm.experimental.cttz.elts.i32.v2048i1(<2048 x i1> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %res.i32.v2i1.true = call i32 @llvm.experimental.cttz.elts.i32.v2i1(<2 x i1> poison, i1 true)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 16 for instruction: %res.i32.v2048i1.true = call i32 @llvm.experimental.cttz.elts.i32.v2048i1(<2048 x i1> poison, i1 true)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %res.i32.v2i32 = call i32 @llvm.experimental.cttz.elts.i32.v2i32(<2 x i32> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %res.i32.v4i32 = call i32 @llvm.experimental.cttz.elts.i32.v4i32(<4 x i32> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 11 for instruction: %res.i32.v32i32 = call i32 @llvm.experimental.cttz.elts.i32.v32i32(<32 x i32> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %res.i32.v2i33 = call i32 @llvm.experimental.cttz.elts.i32.v2i33(<2 x i33> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 5 for instruction: %res.i32.v4i33 = call i32 @llvm.experimental.cttz.elts.i32.v4i33(<4 x i33> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 22 for instruction: %res.i32.v32i33 = call i32 @llvm.experimental.cttz.elts.i32.v32i33(<32 x i33> poison, i1 false)
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: ret void
+;
+  %res.i32.v2i1.false = call i32 @llvm.experimental.cttz.elts.i32.v2i1(<2 x i1> poison, i1 false)
+  %res.i32.v4i1.false = call i32 @llvm.experimental.cttz.elts.i32.v4i1(<4 x i1> poison, i1 false)
+  %res.i32.v8i1.false = call i32 @llvm.experimental.cttz.elts.i32.v8i1(<8 x i1> poison, i1 false)
+  %res.i32.v64i1.false = call i32 @llvm.experimental.cttz.elts.i32.v64i1(<64 x i1> poison, i1 false)
+  %res.i32.v128i1.false = call i32 @llvm.experimental.cttz.elts.i32.v128i1(<128 x i1> poison, i1 false)
+  %res.i32.v1024i1.false = call i32 @llvm.experimental.cttz.elts.i32.v1024i1(<1024 x i1> poison, i1 false)
+  %res.i32.v2048i1.false = call i32 @llvm.experimental.cttz.elts.i32.v2048i1(<2048 x i1> poison, i1 false)
+
+  %res.i32.v2i1.true = call i32 @llvm.experimental.cttz.elts.i32.v2i1(<2 x i1> poison, i1 true)
+  %res.i32.v2048i1.true = call i32 @llvm.experimental.cttz.elts.i32.v2i1(<2048 x i1> poison, i1 true)
+
+  ; Non-boolean element-types should have an additonal vector-compare.
+  %res.i32.v2i32 = call i32 @llvm.experimental.cttz.elts.i32.v2i32(<2 x i32> poison, i1 false)
+  %res.i32.v4i32 = call i32 @llvm.experimental.cttz.elts.i32.v4i32(<4 x i32> poison, i1 false)
+  %res.i32.v32i32 = call i32 @llvm.experimental.cttz.elts.i32.v32i32(<32 x i32> poison, i1 false)
+
+  ; Illegal types.
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wangpc-pp wrote:

That is the point. `isTypeLegal()` was removed in `shouldExpandCttzElements`?

https://github.com/llvm/llvm-project/pull/214795