From: Shriya Sharma <shriya@redsemiconductor.com>
Date: Mon, 8 Jan 2024 14:01:13 +0000 (+0000)
Subject: adding missing files
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=18b2788883edcbeeed181ae4c727b0d68891d767;p=libreriscv.git

adding missing files
---

diff --git a/conferences/fosdem2024/fosdem2024_ddffirst/pospopcount.c b/conferences/fosdem2024/fosdem2024_ddffirst/pospopcount.c
new file mode 100644
index 000000000..0fe84be45
--- /dev/null
+++ b/conferences/fosdem2024/fosdem2024_ddffirst/pospopcount.c
@@ -0,0 +1,11 @@
+// Copyright (c) 2020 Robert Clausecker <fuz@fuz.su>
+// count8 reference implementation for tests.  Do not alter.
+func count8safe(counts *[8]int, buf []uint8) 
+	{
+		for i := range buf {
+			for j := 0; j < 8; j++ {
+				counts[j] += int(buf[i] >> j & 1)
+			}
+		}
+	}
+		
\ No newline at end of file
diff --git a/conferences/fosdem2024/fosdem2024_ddffirst/pospopcount.s b/conferences/fosdem2024/fosdem2024_ddffirst/pospopcount.s
new file mode 100644
index 000000000..c8347927f
--- /dev/null
+++ b/conferences/fosdem2024/fosdem2024_ddffirst/pospopcount.s
@@ -0,0 +1,14 @@
+
+	mtspr 9, 3                 # move r3 to CTR
+	setvl 3,0,8,0,1,1          # set MVL=8, VL=r3=MIN(MVL,CTR)
+	# load VL bytes (update r4 addr) but compressed (dw=8)
+	addi 6, 0, 0               # initialise all 64-bits of r6 to zero
+	sv.lbzu/pi/dw=8 *6, 1(4)   # should be /lf here as well
+	# gather performs the transpose (which gets us to positional..)
+	gbbd 8,6
+	# now those bits have been turned around, popcount and sum them
+	setvl 0,0,8,0,1,1          # set MVL=VL=8
+	sv.popcntd/sw=8 *24,*8     # do the (now transposed) popcount
+	sv.add *16,*16,*24         # and accumulate in results
+	# branch back if CTR still non-zero. works even though VL=8
+	sv.bc/all 16, *0, -0x28   # reduce CTR by VL and stop if -ve
\ No newline at end of file