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Add inital bytecode optimizations for #1163

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This removes unnecessary movn, movf, lds, and a few other instructions.
Any instructions that has not side effects and writes to a slot that
isn't used can be removed. A number of other optimizations can follow
from this:

- Implement the def-aliasing-var optimization better
- This function can be iterated as a fix point until no more
  instructions are removed.
- If we implement slot renaming, then we no longer need to free slots
  and can simplify the initial code generation a lot.
This commit is contained in:
Calvin Rose
2023-05-29 16:10:48 -05:00
parent 4aca94154f
commit 4782a76bca
8 changed files with 313 additions and 8 deletions
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Makefile
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@@ -51,7 +51,7 @@ LDFLAGS?=-rdynamic
RUN:=$(RUN)
COMMON_CFLAGS:=-std=c99 -Wall -Wextra -Isrc/include -Isrc/conf -fvisibility=hidden -fPIC
BOOT_CFLAGS:=-DJANET_BOOTSTRAP -DJANET_BUILD=$(JANET_BUILD) -O0 $(COMMON_CFLAGS)
BOOT_CFLAGS:=-DJANET_BOOTSTRAP -DJANET_BUILD=$(JANET_BUILD) -O0 $(COMMON_CFLAGS) -g
BUILD_CFLAGS:=$(CFLAGS) $(COMMON_CFLAGS)
# For installation