diff --git a/kernels/arm/neon/3/bli_gemm_opt_4x4.c b/kernels/arm/neon/3/bli_gemm_opt_4x4.c
index eaa6909b6..bd2b26f10 100644
--- a/kernels/arm/neon/3/bli_gemm_opt_4x4.c
+++ b/kernels/arm/neon/3/bli_gemm_opt_4x4.c
@@ -519,7 +519,15 @@ void bli_cgemm_opt_4x4(
                         scomplex* restrict b_next
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 void bli_zgemm_opt_4x4(
@@ -533,6 +541,14 @@ void bli_zgemm_opt_4x4(
                         dcomplex* restrict b_next
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
diff --git a/kernels/bgq/3/bli_gemm_8x8.c b/kernels/bgq/3/bli_gemm_8x8.c
index ce22c88b3..2c0b1a56a 100644
--- a/kernels/bgq/3/bli_gemm_8x8.c
+++ b/kernels/bgq/3/bli_gemm_8x8.c
@@ -45,7 +45,15 @@ void bli_sgemm_8x8(
                         float* a_next, float* b_next
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_sgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 
@@ -244,7 +252,15 @@ void bli_cgemm_8x8(
                         scomplex* a_next, scomplex* b_next
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 void bli_zgemm_8x8(
@@ -257,7 +273,15 @@ void bli_zgemm_8x8(
                         dcomplex* a_next, dcomplex* b_next
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 
@@ -272,7 +296,15 @@ void bli_sgemm_8x8_mt(
                         int t_id
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_sgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 void bli_cgemm_8x8_mt(
@@ -286,7 +318,15 @@ void bli_cgemm_8x8_mt(
                         int t_id
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 void bli_zgemm_8x8_mt(
@@ -300,5 +340,13 @@ void bli_zgemm_8x8_mt(
                         int t_id
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
diff --git a/kernels/loongson3a/3/bli_gemm_opt_d4x4.c b/kernels/loongson3a/3/bli_gemm_opt_d4x4.c
index 83659529d..aa03420a0 100644
--- a/kernels/loongson3a/3/bli_gemm_opt_d4x4.c
+++ b/kernels/loongson3a/3/bli_gemm_opt_d4x4.c
@@ -46,7 +46,15 @@ void bli_sgemm_opt_d4x4(
 
                        )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_sgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 void bli_dgemm_opt_d4x4(
@@ -547,7 +555,15 @@ void bli_cgemm_opt_d4x4(
                          scomplex* restrict b_next
                        )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 void bli_zgemm_opt_d4x4(
@@ -561,6 +577,14 @@ void bli_zgemm_opt_d4x4(
                          dcomplex* restrict b_next
                        )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
diff --git a/kernels/x86_64/avx/3/bli_gemm_opt_8x4_ref_u4_nodupl_avx1.c b/kernels/x86_64/avx/3/bli_gemm_opt_8x4_ref_u4_nodupl_avx1.c
index 5f9878f87..b69343e59 100644
--- a/kernels/x86_64/avx/3/bli_gemm_opt_8x4_ref_u4_nodupl_avx1.c
+++ b/kernels/x86_64/avx/3/bli_gemm_opt_8x4_ref_u4_nodupl_avx1.c
@@ -48,7 +48,15 @@ void bli_sgemm_opt_8x4_ref_u4_nodupl_avx1(
                         float* restrict    b_next
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_sgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 
@@ -637,7 +645,15 @@ void bli_cgemm_opt_8x4_ref_u4_nodupl_avx1(
                         scomplex* restrict b_next
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 
@@ -653,6 +669,14 @@ void bli_zgemm_opt_8x4_ref_u4_nodupl_avx1(
                         dcomplex* restrict b_next
                       )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
diff --git a/kernels/x86_64/core2-sse3/3/bli_gemm_opt_d4x4.c b/kernels/x86_64/core2-sse3/3/bli_gemm_opt_d4x4.c
index f133d8e64..f6c7ab240 100644
--- a/kernels/x86_64/core2-sse3/3/bli_gemm_opt_d4x4.c
+++ b/kernels/x86_64/core2-sse3/3/bli_gemm_opt_d4x4.c
@@ -1343,7 +1343,15 @@ void bli_cgemm_opt_d4x4(
                          scomplex* restrict b_next
                        )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
 void bli_zgemm_opt_d4x4(
@@ -1357,6 +1365,14 @@ void bli_zgemm_opt_d4x4(
                          dcomplex* restrict b_next
                        )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
diff --git a/kernels/x86_64/core2-sse3/3/bli_gemmtrsm_l_opt_d4x4.c b/kernels/x86_64/core2-sse3/3/bli_gemmtrsm_l_opt_d4x4.c
index 423b829f2..19a5ba2e7 100644
--- a/kernels/x86_64/core2-sse3/3/bli_gemmtrsm_l_opt_d4x4.c
+++ b/kernels/x86_64/core2-sse3/3/bli_gemmtrsm_l_opt_d4x4.c
@@ -46,7 +46,16 @@ void bli_sgemmtrsm_l_opt_d4x4(
                                float* restrict    b_next
                              )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_sgemmtrsm_l_ref_mxn( k,
+	                         alpha,
+	                         a10,
+	                         a11,
+	                         b01,
+	                         b11,
+	                         c11, rs_c, cs_c,
+	                         a_next,
+	                         b_next );
 }
 
 void bli_dgemmtrsm_l_opt_d4x4(
@@ -546,7 +555,16 @@ void bli_cgemmtrsm_l_opt_d4x4(
                                scomplex* restrict b_next
                              )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemmtrsm_l_ref_mxn( k,
+	                         alpha,
+	                         a10,
+	                         a11,
+	                         b01,
+	                         b11,
+	                         c11, rs_c, cs_c,
+	                         a_next,
+	                         b_next );
 }
 
 void bli_zgemmtrsm_l_opt_d4x4(
@@ -561,6 +579,15 @@ void bli_zgemmtrsm_l_opt_d4x4(
                                dcomplex* restrict b_next
                              )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemmtrsm_l_ref_mxn( k,
+	                         alpha,
+	                         a10,
+	                         a11,
+	                         b01,
+	                         b11,
+	                         c11, rs_c, cs_c,
+	                         a_next,
+	                         b_next );
 }
 
diff --git a/kernels/x86_64/core2-sse3/3/bli_gemmtrsm_u_opt_d4x4.c b/kernels/x86_64/core2-sse3/3/bli_gemmtrsm_u_opt_d4x4.c
index 9a43efe80..fd80b6061 100644
--- a/kernels/x86_64/core2-sse3/3/bli_gemmtrsm_u_opt_d4x4.c
+++ b/kernels/x86_64/core2-sse3/3/bli_gemmtrsm_u_opt_d4x4.c
@@ -46,7 +46,16 @@ void bli_sgemmtrsm_u_opt_d4x4(
                                float* restrict    b_next
                              )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_sgemmtrsm_l_ref_mxn( k,
+	                         alpha,
+	                         a10,
+	                         a11,
+	                         b01,
+	                         b11,
+	                         c11, rs_c, cs_c,
+	                         a_next,
+	                         b_next );
 }
 
 void bli_dgemmtrsm_u_opt_d4x4(
@@ -532,7 +541,16 @@ void bli_cgemmtrsm_u_opt_d4x4(
                                scomplex* restrict b_next
                              )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemmtrsm_l_ref_mxn( k,
+	                         alpha,
+	                         a10,
+	                         a11,
+	                         b01,
+	                         b11,
+	                         c11, rs_c, cs_c,
+	                         a_next,
+	                         b_next );
 }
 
 void bli_zgemmtrsm_u_opt_d4x4(
@@ -547,6 +565,15 @@ void bli_zgemmtrsm_u_opt_d4x4(
                                dcomplex* restrict b_next
                              )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemmtrsm_l_ref_mxn( k,
+	                         alpha,
+	                         a10,
+	                         a11,
+	                         b01,
+	                         b11,
+	                         c11, rs_c, cs_c,
+	                         a_next,
+	                         b_next );
 }
 
diff --git a/kernels/x86_64/core2-sse3/3/bli_trsm_l_opt_d4x4.c b/kernels/x86_64/core2-sse3/3/bli_trsm_l_opt_d4x4.c
index b6eaeafa8..eaaf31cf4 100644
--- a/kernels/x86_64/core2-sse3/3/bli_trsm_l_opt_d4x4.c
+++ b/kernels/x86_64/core2-sse3/3/bli_trsm_l_opt_d4x4.c
@@ -40,7 +40,10 @@ void bli_strsm_l_opt_d4x4(
                            float* restrict    c11, inc_t rs_c, inc_t cs_c
                          )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_strsm_l_ref_mxn( a11,
+	                     b11,
+	                     c11, rs_c, cs_c );
 }
 
 void bli_dtrsm_l_opt_d4x4(
@@ -208,7 +211,10 @@ void bli_ctrsm_l_opt_d4x4(
                            scomplex* restrict c11, inc_t rs_c, inc_t cs_c
                          )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_ctrsm_l_ref_mxn( a11,
+	                     b11,
+	                     c11, rs_c, cs_c );
 }
 
 void bli_ztrsm_l_opt_d4x4(
@@ -217,6 +223,9 @@ void bli_ztrsm_l_opt_d4x4(
                            dcomplex* restrict c11, inc_t rs_c, inc_t cs_c
                          )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_ztrsm_l_ref_mxn( a11,
+	                     b11,
+	                     c11, rs_c, cs_c );
 }
 
diff --git a/kernels/x86_64/core2-sse3/3/bli_trsm_u_opt_d4x4.c b/kernels/x86_64/core2-sse3/3/bli_trsm_u_opt_d4x4.c
index 2155031a5..b7564c2e8 100644
--- a/kernels/x86_64/core2-sse3/3/bli_trsm_u_opt_d4x4.c
+++ b/kernels/x86_64/core2-sse3/3/bli_trsm_u_opt_d4x4.c
@@ -40,7 +40,10 @@ void bli_strsm_u_opt_d4x4(
                            float* restrict    c11, inc_t rs_c, inc_t cs_c
                          )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_strsm_u_ref_mxn( a11,
+	                     b11,
+	                     c11, rs_c, cs_c );
 }
 
 void bli_dtrsm_u_opt_d4x4(
@@ -211,7 +214,10 @@ void bli_ctrsm_u_opt_d4x4(
                            scomplex* restrict c11, inc_t rs_c, inc_t cs_c
                          )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_ctrsm_u_ref_mxn( a11,
+	                     b11,
+	                     c11, rs_c, cs_c );
 }
 
 void bli_ztrsm_u_opt_d4x4(
@@ -220,6 +226,9 @@ void bli_ztrsm_u_opt_d4x4(
                            dcomplex* restrict c11, inc_t rs_c, inc_t cs_c
                          )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_ztrsm_u_ref_mxn( a11,
+	                     b11,
+	                     c11, rs_c, cs_c );
 }
 
diff --git a/kernels/x86_64/piledriver/3/bli_gemm_4x6.c b/kernels/x86_64/piledriver/3/bli_gemm_4x6.c
index 4fc3cb8ad..787daa93c 100644
--- a/kernels/x86_64/piledriver/3/bli_gemm_4x6.c
+++ b/kernels/x86_64/piledriver/3/bli_gemm_4x6.c
@@ -46,7 +46,15 @@
                     float* a_next, float* b_next
                   )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_sgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
  void bli_dgemm_4x6(
@@ -676,7 +684,15 @@
                     scomplex* a_next, scomplex* b_next
                   )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_cgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }
 
  void bli_zgemm_4x6(
@@ -689,6 +705,14 @@
                     dcomplex* a_next, dcomplex* b_next
                   )
 {
-	bli_check_error_code( BLIS_NOT_YET_IMPLEMENTED );
+	/* Just call the reference implementation. */
+	bli_zgemm_ref_mxn( k,
+	                   alpha,
+	                   a,
+	                   b,
+	                   beta,
+	                   c, rs_c, cs_c,
+	                   a_next,
+	                   b_next );
 }