T0b1/wasmtime
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

riscv64: Improve ctz/clz/cls codegen (#5854)

Browse Source 
* cranelift: Add extra runtests for `clz`/`ctz`

* riscv64: Restrict lowering rules for `ctz`/`clz`

* cranelift: Add `u64` isle helpers

* riscv64: Improve `ctz` codegen

* riscv64: Improve `clz` codegen

* riscv64: Improve `cls` codegen

* riscv64: Improve `clz.i128` codegen

Instead of checking if we have 64 zeros in the top half. Check
if it *is* 0, that way we avoid loading the `64` constant.

* riscv64: Improve `ctz.i128` codegen

Instead of checking if we have 64 zeros in the bottom half. Check
if it *is* 0, that way we avoid loading the `64` constant.

* riscv64: Use extended value in `lower_cls`

* riscv64: Use pattern matches on `bseti`
This commit is contained in:
Afonso Bordado
2023-03-21 23:15:14 +00:00
committed by GitHub
parent ff6f17ca52
commit 7a3df7dcc0
14 changed files with 617 additions and 167 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
cranelift/codegen/src/prelude.isle
View File

@@ -102,6 +102,9 @@
(decl u64_as_u32 (u32) u64)
(extern extractor u64_as_u32 u64_as_u32)
(decl pure u64_as_i32 (u64) i32)
(extern constructor u64_as_i32 u64_as_i32)
;;;; Primitive Arithmetic ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(decl pure u8_and (u8 u8) u8)