[llvm] [LV] Improve AnyOf reduction codegen. (PR #78304)

[Mel Chen via llvm-commits]

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@@ -8,13 +8,12 @@ target triple = "aarch64-linux-gnu"
 define i32 @select_const_i32_from_icmp(ptr nocapture readonly %v, i64 %n) #0 {
 ; CHECK-VF4IC1-LABEL: @select_const_i32_from_icmp
 ; CHECK-VF4IC1:      vector.body:
-; CHECK-VF4IC1:        [[VEC_PHI:%.*]] = phi <vscale x 4 x i32> [ shufflevector (<vscale x 4 x i32> insertelement (<vscale x 4 x i32> poison, i32 3, i64 0), <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer), %vector.ph ], [ [[VEC_SEL:%.*]], %vector.body ]
+; CHECK-VF4IC1:        [[VEC_PHI:%.*]] = phi <vscale x 4 x i1> [ zeroinitializer, %vector.ph ], [ [[VEC_SEL:%.*]], %vector.body ]
 ; CHECK-VF4IC1:        [[VEC_LOAD:%.*]] = load <vscale x 4 x i32>
 ; CHECK-VF4IC1-NEXT:   [[VEC_ICMP:%.*]] = icmp eq <vscale x 4 x i32> [[VEC_LOAD]], shufflevector (<vscale x 4 x i32> insertelement (<vscale x 4 x i32> poison, i32 3, i64 0), <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer)
-; CHECK-VF4IC1-NEXT:   [[VEC_SEL]] = select <vscale x 4 x i1> [[VEC_ICMP]], <vscale x 4 x i32> [[VEC_PHI]], <vscale x 4 x i32> shufflevector (<vscale x 4 x i32> insertelement (<vscale x 4 x i32> poison, i32 7, i64 0), <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer)
+; CHECK-VF4IC1-NEXT:   [[VEC_SEL]] = or <vscale x 4 x i1> [[VEC_PHI]], [[VEC_ICMP]]
 ; CHECK-VF4IC1:      middle.block:
-; CHECK-VF4IC1-NEXT:   [[FIN_ICMP:%.*]] = icmp ne <vscale x 4 x i32> [[VEC_SEL]], shufflevector (<vscale x 4 x i32> insertelement (<vscale x 4 x i32> poison, i32 3, i64 0), <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer)
-; CHECK-VF4IC1-NEXT:   [[OR_RDX:%.*]] = call i1 @llvm.vector.reduce.or.nxv4i1(<vscale x 4 x i1> [[FIN_ICMP]])
+; CHECK-VF4IC1-NEXT:   [[OR_RDX:%.*]] = call i1 @llvm.vector.reduce.or.nxv4i1(<vscale x 4 x i1> [[VEC_SEL]])
 ; CHECK-VF4IC1-NEXT:   {{.*}} = select i1 [[OR_RDX]], i32 7, i32 3
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Mel-Chen wrote:

I see. 
But besides this case, `llvm/test/Transforms/LoopVectorize/RISCV/select-cmp-reduction.ll` also lacks the xor operation. I haven't thoroughly checked if other test cases have similar situations.
Could you please update it? Thank you.

https://github.com/llvm/llvm-project/pull/78304