commit 448ac4857f20a6388f22840e8efd0fc1c049eb17
parent 3018fe5bead90d81f451e4a9ca9f4b9e469837cb
Author: Brian Swetland <swetland@frotz.net>
Date: Mon, 30 Jun 2025 12:05:58 -0700
softrisc32: improve instruction table
Take advantage of the fact that mkinstab considers all non-
'0' or '1' bits in the entries as don't care and use mark
up the fields in the instructions for better clarity.
Diffstat:
| M | softrisc32/instab.txt | | | 127 | ++++++++++++++++++++++++++++++++++++++++++------------------------------------- |
1 file changed, 67 insertions(+), 60 deletions(-)
diff --git a/softrisc32/instab.txt b/softrisc32/instab.txt
@@ -2,64 +2,71 @@
# Licensed under the Apache License, Version 2.0.
00000000000000000000000000000000 nop
-----------------00000-----000000 li %d, %i
-0000000000000000----------000000 mv %d, %a
---------------------------000000 addi %d, %a, %i
-000000000000--------------010000 add %d, %a, %b
-0000000000000000----------000001 neg %d, %a
---------------------------000001 subi %d, %a, %i
-000000000000--------------010001 sub %d, %a, %b
---------------------------000010 andi %d, %a, %i
-000000000000--------------010010 and %d, %a, %b
---------------------------000011 ori %d, %a, %i
-000000000000--------------010011 or %d, %a, %b
-1111111111111111----------000100 not %d, %a
---------------------------000100 xori %d, %a, %i
-000000000000--------------010100 xor %d, %a, %b
---------------------------000101 slli %d, %a, %i
-000000000000--------------010101 sll %d, %a, %b
---------------------------000110 srli %d, %a, %i
-000000000000--------------010110 srl %d, %a, %b
---------------------------000111 srai %d, %a, %i
-000000000000--------------010111 sra %d, %a, %b
---------------------------001000 slti %d, %a, %i
-000000000000--------------011000 slt %d, %a, %b
-0000000000000001----------001001 seqz %d, %a
---------------------------001001 sltui %d, %a, %i
-000000000000--------------011001 sltu %d, %a, %b
---------------------------001010 muli %d, %a, %i
-000000000000--------------011010 mul %d, %a, %b
---------------------------001011 divi %d, %a, %i
-000000000000--------------011011 div %d, %a, %b
-0000000000000000-----00000011111 jr %a
-0000000000000000----------011111 jalr %d, %a
---------------------------011111 jalr %d, %a, %i
---------------------------100000 ldw %d, %i(%a)
---------------------------100001 ldh %d, %i(%a)
---------------------------100010 ldb %d, %i(%a)
-----------------00000-----100011 ldx %d, %i
---------------------------100011 ldx %d, %i(%a)
---------------------------100100 lui %d, %U
---------------------------100101 ldhu %d, %i(%a)
---------------------------100110 ldbu %d, %i(%a)
---------------------------100111 auipc %d, %U
---------------------------101000 stw %d, %i(%a)
---------------------------101001 sth %d, %i(%a)
---------------------------101010 stb %d, %i(%a)
-----------------00000-----101011 stx %d, %i
---------------------------101011 stx %d, %i(%a)
----------------------00000110000 bz %a, %B
---------------------------110000 beq %a, %d, %B
----------------------00000110001 bnz %a, %B
---------------------------110001 bne %a, %d, %B
---------------------------110010 blt %a, %d, %B
---------------------------110011 bltu %a, %d, %B
---------------------------110100 bge %a, %d, %B
---------------------------110101 bgeu %a, %d, %B
----------------------00000111000 j %d, %J
----------------------00001111000 call %d, %J
---------------------------111000 jal %d, %J
---------------------------111001 syscall %i
---------------------------111010 break
---------------------------111011 sysret
+iiiiiiiiiiiiiiii00000ttttt000000 li %d, %i
+0000000000000000aaaaattttt000000 mv %d, %a
+iiiiiiiiiiiiiiiiaaaaattttt000000 addi %d, %a, %i
+0000000000000000aaaaattttt000001 neg %d, %a
+iiiiiiiiiiiiiiiiaaaaattttt000001 subi %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt000010 andi %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt000011 ori %d, %a, %i
+1111111111111111aaaaattttt000100 not %d, %a
+iiiiiiiiiiiiiiiiaaaaattttt000100 xori %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt000101 slli %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt000110 srli %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt000111 srai %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt001000 slti %d, %a, %i
+0000000000000001aaaaattttt001001 seqz %d, %a
+iiiiiiiiiiiiiiiiaaaaattttt001001 sltui %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt001010 muli %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt001011 divi %d, %a, %i
+00000000000bbbbbaaaaattttt010000 add %d, %a, %b
+00000000000bbbbbaaaaattttt010001 sub %d, %a, %b
+00000000000bbbbbaaaaattttt010010 and %d, %a, %b
+00000000000bbbbbaaaaattttt010011 or %d, %a, %b
+00000000000bbbbbaaaaattttt010100 xor %d, %a, %b
+00000000000bbbbbaaaaattttt010101 sll %d, %a, %b
+00000000000bbbbbaaaaattttt010110 srl %d, %a, %b
+00000000000bbbbbaaaaattttt010111 sra %d, %a, %b
+0000000000000000aaaaattttt011000 sltz %d, %a
+00000000000bbbbb00000ttttt011000 sgtz %d, %b
+00000000000bbbbbaaaaattttt011000 slt %d, %a, %b
+00000000000bbbbb00000ttttt011001 snez %d, %b
+00000000000bbbbbaaaaattttt011001 sltu %d, %a, %b
+00000000000bbbbbaaaaattttt011010 mul %d, %a, %b
+00000000000bbbbbaaaaattttt011011 div %d, %a, %b
+0000000000000000aaaaa00000011111 jr %a
+0000000000000000aaaaattttt011111 jalr %d, %a
+iiiiiiiiiiibbbbbaaaaattttt011111 jalr %d, %a, %i
+iiiiiiiiiiiiiiiiaaaaattttt100000 ldw %d, %i(%a)
+iiiiiiiiiiiiiiiiaaaaattttt100001 ldh %d, %i(%a)
+iiiiiiiiiiiiiiiiaaaaattttt100010 ldb %d, %i(%a)
+iiiiiiiiiiiiiiii00000ttttt100011 ldx %d, %i
+iiiiiiiiiiiiiiiiaaaaattttt100011 ldx %d, %i(%a)
+iiiiiiiiiiiiiiiiaaaaattttt100100 lui %d, %U
+iiiiiiiiiiiiiiiiaaaaattttt100101 ldhu %d, %i(%a)
+iiiiiiiiiiiiiiiiaaaaattttt100110 ldbu %d, %i(%a)
+iiiiiiiiiiiiiiiiaaaaattttt100111 auipc %d, %U
+iiiiiiiiiiiiiiiiaaaaattttt101000 stw %d, %i(%a)
+iiiiiiiiiiiiiiiiaaaaattttt101001 sth %d, %i(%a)
+iiiiiiiiiiiiiiiiaaaaattttt101010 stb %d, %i(%a)
+iiiiiiiiiiiiiiii00000ttttt101011 stx %d, %i
+iiiiiiiiiiiiiiiiaaaaattttt101011 stx %d, %i(%a)
+iiiiiiiiiiiiiiiiaaaaa00000110000 beqz %a, %B
+iiiiiiiiiiiiiiiiaaaaabbbbb110000 beq %a, %d, %B
+iiiiiiiiiiiiiiiiaaaaa00000110001 bnez %a, %B
+iiiiiiiiiiiiiiiiaaaaabbbbb110001 bne %a, %d, %B
+iiiiiiiiiiiiiiiiaaaaa00000110010 bltz %a, %B
+iiiiiiiiiiiiiiii00000bbbbb110010 bgtz %d, %B
+iiiiiiiiiiiiiiiiaaaaabbbbb110010 blt %a, %d, %B
+iiiiiiiiiiiiiiiiaaaaabbbbb110011 bltu %a, %d, %B
+iiiiiiiiiiiiiiii00000bbbbb110100 blez %d, %B
+iiiiiiiiiiiiiiiiaaaaa00000110100 bgez %a, %B
+iiiiiiiiiiiiiiiiaaaaabbbbb110100 bge %a, %d, %B
+iiiiiiiiiiiiiiiiaaaaabbbbb110101 bgeu %a, %d, %B
+iiiiiiiiiiiiiiiiiiiii00000111000 j %d, %J
+iiiiiiiiiiiiiiiiiiiii00001111000 call %d, %J
+iiiiiiiiiiiiiiiiiiiiittttt111000 jal %d, %J
+iiiiiiiiiiiiiiiiiiiiittttt111001 syscall %i
+iiiiiiiiiiiiiiiiiiiiittttt111010 break
+iiiiiiiiiiiiiiiiiiiiittttt111011 sysret
-------------------------------- unknown
