refactor: update x index recalculation to stride addition

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---

Author: DivitJain26

lib/node_modules/@stdlib/blas/base/ctrsv/lib/base.js

@@ -118,8 +118,8 @@ function ctrsv( uplo, trans, diag, N, A, strideA1, strideA2, offsetA, x, strideX
 		( !isrm && uplo === 'upper' && trans === 'no-transpose' ) ||
 		( isrm && uplo === 'lower' && trans !== 'no-transpose' )
 	) {
+		ix1 = ox + ( ( N - 1 ) * sx );
 		for ( i1 = N - 1; i1 >= 0; i1-- ) {
-			ix1 = ox + ( i1 * sx );
 			rex = viewX[ ix1 ];
 			imx = viewX[ ix1 + 1 ];
 			if ( rex !== 0.0 || imx !== 0.0 ) {
@@ -137,8 +137,9 @@ function ctrsv( uplo, trans, diag, N, A, strideA1, strideA2, offsetA, x, strideX
 					retmp = rex;
 					imtmp = imx;
 				}
+				ix0 = ix1;
 				for ( i0 = i1 - 1; i0 >= 0; i0-- ) {
-					ix0 = ox + ( i0 * sx );
+					ix0 -= sx;
 					ia = oa2 + ( sa0 * i0 );
 					rea = viewA[ ia ];
 					ima = sign * viewA[ ia + 1 ];
@@ -150,15 +151,16 @@ function ctrsv( uplo, trans, diag, N, A, strideA1, strideA2, offsetA, x, strideX
 					viewX[ ix0 + 1 ] = f32( imx - immul );
 				}
 			}
+			ix1 -= sx;
 		}
 		return x;
 	}
 	if (
 		( !isrm && uplo === 'lower' && trans === 'no-transpose' ) ||
 		( isrm && uplo === 'upper' && trans !== 'no-transpose' )
 	) {
+		ix1 = ox;
 		for ( i1 = 0; i1 < N; i1++ ) {
-			ix1 = ox + ( i1 * sx );
 			rex = viewX[ ix1 ];
 			imx = viewX[ ix1 + 1 ];
 			if ( rex !== 0.0 || imx !== 0.0 ) {
@@ -176,8 +178,9 @@ function ctrsv( uplo, trans, diag, N, A, strideA1, strideA2, offsetA, x, strideX
 					retmp = rex;
 					imtmp = imx;
 				}
+				ix0 = ix1;
 				for ( i0 = i1 + 1; i0 < N; i0++ ) {
-					ix0 = ox + ( i0 * sx );
+					ix0 += sx;
 					ia = oa2 + ( sa0 * i0 );
 					rea = viewA[ ia ];
 					ima = sign * viewA[ ia + 1 ];
@@ -189,29 +192,31 @@ function ctrsv( uplo, trans, diag, N, A, strideA1, strideA2, offsetA, x, strideX
 					viewX[ ix0 + 1 ] = f32( imx - immul );
 				}
 			}
+			ix1 += sx;
 		}
 		return x;
 	}
 	if (
 		( !isrm && uplo === 'upper' && trans !== 'no-transpose' ) ||
 		( isrm && uplo === 'lower' && trans === 'no-transpose' )
 	) {
+		ix1 = ox;
 		for ( i1 = 0; i1 < N; i1++ ) {
-			ix1 = ox + ( i1 * sx );
 			oa2 = oa + ( sa1 * i1 );
 			rex = viewX[ ix1 ];
 			imx = viewX[ ix1 + 1 ];
 			retmp = rex;
 			imtmp = imx;
+			ix0 = ox;
 			for ( i0 = 0; i0 < i1; i0++ ) {
-				ix0 = ox + ( i0 * sx );
 				ia = oa2 + ( sa0 * i0 );
 				rea = viewA[ ia ];
 				ima = sign * viewA[ ia + 1 ];
 				rex = viewX[ ix0 ];
 				imx = viewX[ ix0 + 1 ];
 				retmp -= f32( ( rex * rea ) - ( imx * ima ) );
 				imtmp -= f32( ( rex * ima ) + ( imx * rea ) );
+				ix0 += sx;
 			}
 			if ( nonunit ) {
 				ia = oa2 + ( sa0 * i1 );
@@ -225,26 +230,28 @@ function ctrsv( uplo, trans, diag, N, A, strideA1, strideA2, offsetA, x, strideX
 			}
 			viewX[ ix1 ] = retmp;
 			viewX[ ix1 + 1 ] = imtmp;
+			ix1 += sx;
 		}
 		return x;
 	}
 	// ( !isrm && uplo === 'lower' && trans !== 'no-transpose' ) || ( isrm && uplo === 'upper' && trans === 'no-transpose' )
+	ix1 = ox + ( ( N - 1 ) * sx );
 	for ( i1 = N - 1; i1 >= 0; i1-- ) {
-		ix1 = ox + ( i1 * sx );
 		oa2 = oa + ( sa1 * i1 );
 		rex = viewX[ ix1 ];
 		imx = viewX[ ix1 + 1 ];
 		retmp = rex;
 		imtmp = imx;
+		ix0 = ox + ( ( N - 1 ) * sx );
 		for ( i0 = N - 1; i0 > i1; i0-- ) {
-			ix0 = ox + ( i0 * sx );
 			ia = oa2 + ( sa0 * i0 );
 			rea = viewA[ ia ];
 			ima = sign * viewA[ ia + 1 ];
 			rex = viewX[ ix0 ];
 			imx = viewX[ ix0 + 1 ];
 			retmp -= f32( ( rex * rea ) - ( imx * ima ) );
 			imtmp -= f32( ( rex * ima ) + ( imx * rea ) );
+			ix0 -= sx;
 		}
 		if ( nonunit ) {
 			ia = oa2 + ( sa0 * i1 );
@@ -258,6 +265,7 @@ function ctrsv( uplo, trans, diag, N, A, strideA1, strideA2, offsetA, x, strideX
 		}
 		viewX[ ix1 ] = retmp;
 		viewX[ ix1 + 1 ] = imtmp;
+		ix1 -= sx;
 	}
 	return x;
 }