wasm: add a 4x4 SIMD128 GEMM microkernel for SGEMM/DGEMM

Switch WASM128_GENERIC to unroll 4 with matching ncopy/tcopy and TRMM
4x4 so packing width stays consistent. Use relaxed SIMD madd in the
inner loop when compiled with -mrelaxed-simd.

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

Author: jjerphan

Changelog.txt

@@ -158,6 +158,9 @@ x86_64:
 
 wasm:
  - added optimized kernels for STRSM and DTRSM
+ - added a 4x4 WASM SIMD128 GEMM microkernel for SGEMM/DGEMM with matching
+   4-wide packing and TRMM, using relaxed SIMD madd in the inner loop
+ - gated leftover WASM TRSM call counters behind OPENBLAS_WASM_TRSM_PROFILE
 
 ====================================================================
 Version 0.3.32

Makefile.wasm

@@ -1 +1 @@
-CCOMMON_OPT += -msimd128
+CCOMMON_OPT += -msimd128 -mrelaxed-simd

kernel/wasm/KERNEL

@@ -95,10 +95,20 @@ DGEMVTKERNEL = ../riscv64/gemv_t.c
 CGEMVTKERNEL = ../riscv64/zgemv_t.c
 ZGEMVTKERNEL = ../riscv64/zgemv_t.c
 
+# KERNEL.$(TARGET_CORE) is included first; keep its TRMM width if set.
+# Unroll-4 GEMM packing uses trmm_*copy_4, which is wrong with a 2x2 kernel.
+ifndef STRMMKERNEL
 STRMMKERNEL	= ../generic/trmmkernel_2x2.c
+endif
+ifndef DTRMMKERNEL
 DTRMMKERNEL	= ../generic/trmmkernel_2x2.c
+endif
+ifndef CTRMMKERNEL
 CTRMMKERNEL	= ../generic/ztrmmkernel_2x2.c
+endif
+ifndef ZTRMMKERNEL
 ZTRMMKERNEL	= ../generic/ztrmmkernel_2x2.c
+endif
 
 ifndef SGEMMKERNEL
 SGEMMKERNEL    =  ../generic/gemmkernel_2x2.c

kernel/wasm/KERNEL.WASM128_GENERIC

@@ -95,20 +95,20 @@ DGEMVTKERNEL = ../riscv64/gemv_t.c
 CGEMVTKERNEL = ../riscv64/zgemv_t.c
 ZGEMVTKERNEL = ../riscv64/zgemv_t.c
 
-STRMMKERNEL	= ../generic/trmmkernel_2x2.c
-DTRMMKERNEL	= ../generic/trmmkernel_2x2.c
+STRMMKERNEL	= ../generic/trmmkernel_4x4.c
+DTRMMKERNEL	= ../generic/trmmkernel_4x4.c
 CTRMMKERNEL	= ../generic/ztrmmkernel_2x2.c
 ZTRMMKERNEL	= ../generic/ztrmmkernel_2x2.c
 
-SGEMMKERNEL    =  gemmkernel_wasm128.c
-SGEMMONCOPY    =  ../generic/gemm_ncopy_2.c
-SGEMMOTCOPY    =  ../generic/gemm_tcopy_2.c
+SGEMMKERNEL    =  gemmkernel_4x4_wasm128.c
+SGEMMONCOPY    =  ../generic/gemm_ncopy_4.c
+SGEMMOTCOPY    =  ../generic/gemm_tcopy_4.c
 SGEMMONCOPYOBJ =  sgemm_oncopy$(TSUFFIX).$(SUFFIX)
 SGEMMOTCOPYOBJ =  sgemm_otcopy$(TSUFFIX).$(SUFFIX)
 
-DGEMMKERNEL    =  gemmkernel_wasm128.c
-DGEMMONCOPY    = ../generic/gemm_ncopy_2.c
-DGEMMOTCOPY    = ../generic/gemm_tcopy_2.c
+DGEMMKERNEL    =  gemmkernel_4x4_wasm128.c
+DGEMMONCOPY    = ../generic/gemm_ncopy_4.c
+DGEMMOTCOPY    = ../generic/gemm_tcopy_4.c
 DGEMMONCOPYOBJ = dgemm_oncopy$(TSUFFIX).$(SUFFIX)
 DGEMMOTCOPYOBJ = dgemm_otcopy$(TSUFFIX).$(SUFFIX)