From 2d12caabaf2bed535adbd0607efab59114d89947 Mon Sep 17 00:00:00 2001 From: Andrew Waterman Date: Mon, 15 May 2017 23:28:53 -0500 Subject: Move ILEN definition to introduction --- src/extensions.tex | 9 --------- 1 file changed, 9 deletions(-) (limited to 'src/extensions.tex') diff --git a/src/extensions.tex b/src/extensions.tex index efd0760..4346422 100644 --- a/src/extensions.tex +++ b/src/extensions.tex @@ -52,15 +52,6 @@ example, the base ISA is defined within a 30-bit encoding space (bits 31--2 of the 32-bit instruction), while the atomic extension ``A'' fits within a 25-bit encoding space (bits 31--7). -We use the term ILEN to refer to the maximum instruction length supported -by an implementation, which is always a multiple of 16 bits. For -implementations supporting only the base instruction set, ILEN is 32 bits. -Implementations supporting longer instructions have larger values of ILEN. -ILEN is implied from the set of extensions implemented, or can be -explicitly defined in the platform configuration if an implementation is -designed to support an extension that uses longer instructions via software -emulation but does not actually decode longer instructions in hardware. - We use the term {\em prefix} to refer to the bits to the {\em right} of an instruction encoding space (since RISC-V is little-endian, the bits to the right are stored at earlier memory addresses, hence form a -- cgit v1.1