From 37da2899f40661e3e9631e497da8dc59b971cbd0 Mon Sep 17 00:00:00 2001
From: "Charles.Forsyth" <devnull@localhost>
Date: Fri, 22 Dec 2006 17:07:39 +0000
Subject: 20060303a

---
 libmath/gemm.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 libmath/gemm.c

(limited to 'libmath/gemm.c')

diff --git a/libmath/gemm.c b/libmath/gemm.c
new file mode 100644
index 00000000..908a0998
--- /dev/null
+++ b/libmath/gemm.c
@@ -0,0 +1,167 @@
+#include "lib9.h"
+#include "mathi.h"
+void
+gemm(int transa, int transb, int m, int n, int k, double alpha,
+	double *a, int lda,
+	double *b, int ldb, double beta,
+	double *c, int ldc)
+{
+    int i1, i2, i3, nota, notb, i, j, jb, jc, l, la;
+    double temp;
+
+    nota = transa=='N';
+    notb = transb=='N';
+
+    if(m == 0 || n == 0 || (alpha == 0. || k == 0) && beta == 1.){
+	return;
+    }
+    if(alpha == 0.){
+	if(beta == 0.){
+	    i1 = n;
+	    for(j = 0; j < i1; ++j){
+		jc = j*ldc;
+		i2 = m;
+		for(i = 0; i < i2; ++i){
+		    c[i + jc] = 0.;
+		}
+	    }
+	}else{
+	    i1 = n;
+	    for(j = 0; j < i1; ++j){
+		jc = j*ldc;
+		i2 = m;
+		for(i = 0; i < i2; ++i){
+		    c[i + jc] = beta * c[i + jc];
+		}
+	    }
+	}
+	return;
+    }
+
+    if(!a){
+	if(notb){   /* C := alpha*B + beta*C. */
+	    i1 = n;
+	    for(j = 0; j < i1; ++j){
+		jb = j*ldb;
+		jc = j*ldc;
+		i2 = m;
+		for(i = 0; i < i2; ++i){
+		    c[i + jc] = alpha*b[i+jb] + beta*c[i+jc];
+		}
+	    }
+	}else{   /* C := alpha*B' + beta*C. */
+	    i1 = n;
+	    for(j = 0; j < i1; ++j){
+		jc = j*ldc;
+		i2 = m;
+		for(i = 0; i < i2; ++i){
+		    c[i + jc] = alpha*b[j+i*ldb] + beta*c[i+jc];
+		}
+	    }
+	}
+	return;
+    }
+
+    if(notb){
+	if(nota){
+
+/*          Form  C := alpha*A*B + beta*C. */
+	    i1 = n;
+	    for(j = 0; j < i1; ++j){
+		jc = j*ldc;
+		if(beta == 0.){
+		    i2 = m;
+		    for(i = 0; i < i2; ++i){
+			c[i + jc] = 0.;
+		    }
+		}else if(beta != 1.){
+		    i2 = m;
+		    for(i = 0; i < i2; ++i){
+			c[i + jc] = beta * c[i + jc];
+		    }
+		}
+		i2 = k;
+		for(l = 0; l < i2; ++l){
+		    la = l*lda;
+		    if(b[l + j*ldb] != 0.){
+			temp = alpha * b[l + j*ldb];
+			i3 = m;
+			for(i = 0; i < i3; ++i){
+			    c[i + jc] += temp * a[i + la];
+			}
+		    }
+		}
+	    }
+	}else{
+
+/*          Form  C := alpha*A'*B + beta*C */
+	    i1 = n;
+	    for(j = 0; j < i1; ++j){
+		jc = j*ldc;
+		i2 = m;
+		for(i = 0; i < i2; ++i){
+		    temp = 0.;
+		    i3 = k;
+		    for(l = 0; l < i3; ++l){
+			temp += a[l + i*lda] * b[l + j*ldb];
+		    }
+		    if(beta == 0.){
+			c[i + jc] = alpha * temp;
+		    }else{
+			c[i + jc] = alpha * temp + beta * c[i + jc];
+		    }
+		}
+	    }
+	}
+    }else{
+	if(nota){
+
+/*          Form  C := alpha*A*B' + beta*C */
+	    i1 = n;
+	    for(j = 0; j < i1; ++j){
+		jc = j*ldc;
+		if(beta == 0.){
+		    i2 = m;
+		    for(i = 0; i < i2; ++i){
+			c[i + jc] = 0.;
+		    }
+		}else if(beta != 1.){
+		    i2 = m;
+		    for(i = 0; i < i2; ++i){
+			c[i + jc] = beta * c[i + jc];
+		    }
+		}
+		i2 = k;
+		for(l = 0; l < i2; ++l){
+		    if(b[j + l*ldb] != 0.){
+			temp = alpha * b[j + l*ldb];
+			i3 = m;
+			for(i = 0; i < i3; ++i){
+			    c[i + jc] += temp * a[i + l*lda];
+			}
+		    }
+		}
+	    }
+	}else{
+
+/*          Form  C := alpha*A'*B' + beta*C */
+	    i1 = n;
+	    for(j = 0; j < i1; ++j){
+		jc = j*ldc;
+		i2 = m;
+		for(i = 0; i < i2; ++i){
+		    temp = 0.;
+		    i3 = k;
+		    for(l = 0; l < i3; ++l){
+			temp += a[l + i*lda] * b[j + l*ldb];
+		    }
+		    if(beta == 0.){
+			c[i + jc] = alpha * temp;
+		    }else{
+			c[i + jc] = alpha * temp + beta * c[i + jc];
+		    }
+		}
+	    }
+	}
+    }
+}
-- 
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