From 638c56796678da47fef836fbdd056cfb75a639fc Mon Sep 17 00:00:00 2001
From: cheapie <cheapiephp@gmail.com>
Date: Sun, 14 Jun 2026 19:38:46 -0500
Subject: Add Xh3bextm extension from Hazard3

---
 assembly/xh3bextm-test/xh3bextm-test.S | 40 ++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 assembly/xh3bextm-test/xh3bextm-test.S

(limited to 'assembly/xh3bextm-test/xh3bextm-test.S')

diff --git a/assembly/xh3bextm-test/xh3bextm-test.S b/assembly/xh3bextm-test/xh3bextm-test.S
new file mode 100644
index 0000000..20ae6c2
--- /dev/null
+++ b/assembly/xh3bextm-test/xh3bextm-test.S
@@ -0,0 +1,40 @@
+# Xh3bextm macros are from the Hazard3 reference manual, slightly modified
+.macro h3.bextm rd rs1 rs2 nbits
+	.if (\nbits < 1) || (\nbits > 8)
+		.err
+	.endif
+	.insn r 0x0b, 0x0, (((\nbits - 1) & 0x7 ) << 1), \rd, \rs1, \rs2
+.endm
+
+.macro h3.bextmi rd rs1 shamt nbits
+	.if (\nbits < 1) || (\nbits > 8)
+		.err
+	.endif
+	.if (\shamt < 0) || (\shamt > 31)
+		.err
+	.endif
+	.insn i 0x0b, 0x4, \rd, \rs1, (\shamt & 0x1f) | (((\nbits - 1) & 0x7 ) << 6)
+.endm
+
+li t0,0xdeadbeef
+li t1,4
+
+h3.bextm s0,t0,t1,6
+
+# 0xDEADBEEF = 1101 1110 1010 1101 1011 1110 1110 1111   (rs1)
+#                                         vv vvvv
+#                                         10 1110 = 0x2E
+#                                        |---6---|       (imm)
+#                                                |--4-|  (rs2)
+
+
+h3.bextmi s1,t0,16,3
+
+# 0xDEADBEEF = 1101 1110 1010 1101 1011 1110 1110 1111   (rs1)
+#                              vvv
+#                              101 = 0x5
+#                             |-3-|                      (imm2)
+#                                 |--------16--------|   (imm1)
+
+li a7,10
+ecall
-- 
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