symfpu: Configurable rounding modes

Including tests, but currently only testing rounding modes on multiply.
Also missing the ...01 case.

tests/symfpu/run-test.sh

@@ -3,6 +3,7 @@ set -eu
 
 source ../gen-tests-makefile.sh
 
+# operators
 ops="sqrt add sub mul div muladd"
 for op in $ops; do
     rm -f ${op}_edges.*
@@ -32,4 +33,33 @@ prove_op mul "-DMUL -DMULS"
 prove_op div "-DDIV"
 prove_op muladd "-DMULADD -DMULS -DADDS"
 
+# rounding modes
+rms="RNE RNA RTP RTN RTZ"
+for rm in $rms; do
+    rm -f ${rm}_edges.*
+done
+
+prove_rm() {
+    rm=$1
+    defs=$2
+    ys_file=${rm}_edges.ys
+    echo """\
+symfpu -rm $rm
+sat -prove-asserts -verify
+chformal -remove
+opt
+
+read_verilog -sv -formal $defs edges.sv
+chformal -lower
+prep -top edges -flatten
+sat -prove-asserts -verify
+""" > $ys_file
+}
+
+prove_rm RNE "-DRNE"
+prove_rm RNA "-DRNA"
+prove_rm RTP "-DRTP"
+prove_rm RTN "-DRTN"
+prove_rm RTZ "-DRTZ"
+
 generate_mk --yosys-scripts