xilinx: use RAM32M/RAM64M for memories with two read ports

This fixes inefficient LUT RAM usage for memories with one write
and two read ports (commonly used as register files).

diff --git a/techlibs/xilinx/lutrams.txt b/techlibs/xilinx/lutrams.txt
index 29f6b05cc50ccd28ff0bf9ecda44d25d56a64aa3..faf66bc18dd38665f5e9c9991fa90f940465d407 100644 (file)
--- a/techlibs/xilinx/lutrams.txt
+++ b/techlibs/xilinx/lutrams.txt
@@ -153,7 +153,7 @@ endmatch
 
 match $__XILINX_RAM32X2Q
   min bits 5
-  min rports 3
+  min rports 2
   min wports 1
   make_outreg
   or_next_if_better
@@ -161,7 +161,7 @@ endmatch
 
 match $__XILINX_RAM64X1Q
   min bits 5
-  min rports 3
+  min rports 2
   min wports 1
   make_outreg
 endmatch