[CostModel][X86] Update AVX1 sext v8i1 -> v8i32 cost based off worst case llvm-mca numbers

We were using raw instruction count which overestimated the costs for #67803

Author: RKSimon

llvm/lib/Target/X86/X86TargetTransformInfo.cpp

@@ -2666,7 +2666,7 @@ InstructionCost X86TTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst,
   static const TypeConversionCostTblEntry AVXConversionTbl[] = {
     { ISD::SIGN_EXTEND, MVT::v4i64,  MVT::v4i1,   6 },
     { ISD::ZERO_EXTEND, MVT::v4i64,  MVT::v4i1,   4 },
-    { ISD::SIGN_EXTEND, MVT::v8i32,  MVT::v8i1,   7 },
+    { ISD::SIGN_EXTEND, MVT::v8i32,  MVT::v8i1,   4 },
     { ISD::ZERO_EXTEND, MVT::v8i32,  MVT::v8i1,   4 },
     { ISD::SIGN_EXTEND, MVT::v16i16, MVT::v16i1,  4 },
     { ISD::ZERO_EXTEND, MVT::v16i16, MVT::v16i1,  4 },

llvm/test/Analysis/CostModel/X86/cast.ll

@@ -35,7 +35,7 @@ define i32 @add(i32 %arg) {
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 2 for instruction: %B = sext <4 x i1> undef to <4 x i32>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %C = trunc <4 x i32> undef to <4 x i1>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %D = zext <8 x i1> undef to <8 x i32>
-; AVX1-NEXT:  Cost Model: Found an estimated cost of 7 for instruction: %E = sext <8 x i1> undef to <8 x i32>
+; AVX1-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %E = sext <8 x i1> undef to <8 x i32>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 5 for instruction: %F = trunc <8 x i32> undef to <8 x i1>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %G = zext i1 undef to i32
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: %H = trunc i32 undef to i1
@@ -143,7 +143,7 @@ define i32 @zext_sext(<8 x i1> %in) {
 ;
 ; AVX1-LABEL: 'zext_sext'
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %Z = zext <8 x i1> %in to <8 x i32>
-; AVX1-NEXT:  Cost Model: Found an estimated cost of 7 for instruction: %S = sext <8 x i1> %in to <8 x i32>
+; AVX1-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %S = sext <8 x i1> %in to <8 x i32>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %A1 = zext <16 x i8> undef to <16 x i16>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %A2 = sext <16 x i8> undef to <16 x i16>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %A = sext <8 x i16> undef to <8 x i32>
@@ -343,7 +343,7 @@ define i32 @masks8(<8 x i1> %in) {
 ;
 ; AVX1-LABEL: 'masks8'
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %Z = zext <8 x i1> %in to <8 x i32>
-; AVX1-NEXT:  Cost Model: Found an estimated cost of 7 for instruction: %S = sext <8 x i1> %in to <8 x i32>
+; AVX1-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %S = sext <8 x i1> %in to <8 x i32>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: ret i32 undef
 ;
 ; AVX2-LABEL: 'masks8'

llvm/test/Analysis/CostModel/X86/extend.ll

@@ -1971,7 +1971,7 @@ define i32 @sext_vXi1() "min-legal-vector-width"="256" {
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %I32 = sext i1 undef to i32
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 2 for instruction: %V2i32 = sext <2 x i1> undef to <2 x i32>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 2 for instruction: %V4i32 = sext <4 x i1> undef to <4 x i32>
-; AVX1-NEXT:  Cost Model: Found an estimated cost of 7 for instruction: %V8i32 = sext <8 x i1> undef to <8 x i32>
+; AVX1-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %V8i32 = sext <8 x i1> undef to <8 x i32>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 6 for instruction: %V16i32 = sext <16 x i1> undef to <16 x i32>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 13 for instruction: %V32i32 = sext <32 x i1> undef to <32 x i32>
 ; AVX1-NEXT:  Cost Model: Found an estimated cost of 26 for instruction: %V64i32 = sext <64 x i1> undef to <64 x i32>
@@ -2251,7 +2251,7 @@ define i32 @sext_vXi1() "min-legal-vector-width"="256" {
 ; BTVER2-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %I32 = sext i1 undef to i32
 ; BTVER2-NEXT:  Cost Model: Found an estimated cost of 2 for instruction: %V2i32 = sext <2 x i1> undef to <2 x i32>
 ; BTVER2-NEXT:  Cost Model: Found an estimated cost of 2 for instruction: %V4i32 = sext <4 x i1> undef to <4 x i32>
-; BTVER2-NEXT:  Cost Model: Found an estimated cost of 7 for instruction: %V8i32 = sext <8 x i1> undef to <8 x i32>
+; BTVER2-NEXT:  Cost Model: Found an estimated cost of 4 for instruction: %V8i32 = sext <8 x i1> undef to <8 x i32>
 ; BTVER2-NEXT:  Cost Model: Found an estimated cost of 6 for instruction: %V16i32 = sext <16 x i1> undef to <16 x i32>
 ; BTVER2-NEXT:  Cost Model: Found an estimated cost of 13 for instruction: %V32i32 = sext <32 x i1> undef to <32 x i32>
 ; BTVER2-NEXT:  Cost Model: Found an estimated cost of 26 for instruction: %V64i32 = sext <64 x i1> undef to <64 x i32>