Update description of FP behaviour

1 files changed, 18 insertions, 4 deletions

diff --git a/gas/doc/c-sh.texi b/gas/doc/c-sh.texi
index e19959b..509106f 100644
--- a/gas/doc/c-sh.texi
+++ b/gas/doc/c-sh.texi
@@ -1,4 +1,4 @@
-@c Copyright 1991, 1992, 1993, 1994, 1995, 1997, 2001
+@c Copyright 1991, 1992, 1993, 1994, 1995, 1997, 2001, 2004
 @c Free Software Foundation, Inc.
 @c This is part of the GAS manual.
 @c For copying conditions, see the file as.texinfo.
@@ -164,9 +164,23 @@ Immediate data
 
 @cindex floating point, SH (@sc{ieee})
 @cindex SH floating point (@sc{ieee})
-The SH family has no hardware floating point, but the @code{.float}
-directive generates @sc{ieee} floating-point numbers for compatibility
-with other development tools.
+SH2E, SH3E and SH4 groups have on-chip floating-point unit (FPU). Other
+SH groups can use @code{.float} directive to generate @sc{ieee} 
+floating-point numbers. 
+
+SH2E and SH3E support single-precision floating point calculations as 
+well as entirely PCAPI compatible emulation of double-precision 
+floating point calculations. SH2E and SH3E instructions are a subset of
+the floating point calculations conforming to the IEEE754 standard.
+
+In addition to single-precision and double-precision floating-point 
+operation capability, the on-chip FPU of SH4 has a 128-bit graphic 
+engine that enables 32-bit floating-point data to be processed 128 
+bits at a time. It also supports 4 * 4 array operations and inner 
+product operations. Also, a superscalar architecture is employed that 
+enables simultaneous execution of two instructions (including FPU 
+instructions), providing performance of up to twice that of 
+conventional architectures at the same frequency.
 
 @node SH Directives
 @section SH Machine Directives