From: Luke Kenneth Casson Leighton Date: Wed, 11 Apr 2018 17:26:37 +0000 (+0100) Subject: add cond-code retrofit X-Git-Tag: convert-csv-opcode-to-binary~5704 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=bfab33b22f88de4e69a260f1062373f6ced4f315;p=libreriscv.git add cond-code retrofit --- diff --git a/simple_v_extension.mdwn b/simple_v_extension.mdwn index e13f1a803..b90f9fcd6 100644 --- a/simple_v_extension.mdwn +++ b/simple_v_extension.mdwn @@ -344,11 +344,19 @@ current vector index" instead. There is, in the standard Conditional Branch instruction, more than adequate space to interpret it in a similar fashion: -| 31 |30 25 |24 20 | 19 15 | 14 12 | 11 8 | 7 | 6 0 | +| 31 |30 ..... 25 |24 ... 20 | 19 ... 15 | 14 ...... 12 | 11 ....... 8 | 7 | 6 ....... 0 | | ----- |----------- |--------- | --------- | ------------ | ------------- | ----- | ----------- | | imm[12] | imm[10:5] | rs2 | rs1 | funct3 | imm[4:1] | imm[11] | opcode | | 1 | 6 | 5 | 5 | 3 | 4 | 1 | 7 | -| offset|[12,10:5] | src2 | src1 | BE? | offset|[11,4:1] | BRANCH | +| offset[12,10:5] || src2 | src1 | BE? | offset[11,4:1] || BRANCH | + +This would become: + +| 31 |30 ..... 25 |24 ... 20 | 19 ... 15 | 14 ...... 12 | 11 ....... 8 | 7 | 6 ....... 0 | +| ----- |----------- |--------- | --------- | ------------ | ------------- | ----- | ----------- | +| imm[12] | imm[10:5] | rs2 | rs1 | funct3 | imm[4:1] | imm[11] | opcode | +| 1 | 6 | 5 | 5 | 3 | 4 | 1 | 7 | +| reserved || src2 | src1 | BE? | predicate rs3 || BRANCH | ## Conclusions