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Hexagon (target/hexagon) Analyze reads before writes

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We divide gen_analyze_funcs.py into 3 phases
    Declare the operands
    Analyze the register reads
    Analyze the register writes

We also create special versions of ctx_log_*_read for new operands
    Check that the operand is written before the read

This is a precursor to improving the analysis for short-circuiting
the packet semantics in a subsequent commit

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20240201103340.119081-2-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
This commit is contained in:
Taylor Simpson 2024-02-01 03:33:38 -07:00 • committed by Brian Cain
parent 248f6f62df
commit 76eaa97157
4 changed files with 83 additions and 49 deletions
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34
target/hexagon/gen_analyze_funcs.py
View file

@ -1,7 +1,7 @@
#!/usr/bin/env python3
##
## Copyright(c) 2022-2023 Qualcomm Innovation Center, Inc. All Rights Reserved.
## Copyright(c) 2022-2024 Qualcomm Innovation Center, Inc. All Rights Reserved.
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
@ -44,15 +44,25 @@ def gen_analyze_func(f, tag, regs, imms):
f.write(" Insn *insn G_GNUC_UNUSED = ctx->insn;\n")
i = 0
## Analyze all the registers
for regtype, regid in regs:
reg = hex_common.get_register(tag, regtype, regid)
## Declare all the registers
for regno, register in enumerate(regs):
reg_type, reg_id = register
reg = hex_common.get_register(tag, reg_type, reg_id)
reg.decl_reg_num(f, regno)
## Analyze the register reads
for regno, register in enumerate(regs):
reg_type, reg_id = register
reg = hex_common.get_register(tag, reg_type, reg_id)
if reg.is_read():
reg.analyze_read(f, regno)
## Analyze the register writes
for regno, register in enumerate(regs):
reg_type, reg_id = register
reg = hex_common.get_register(tag, reg_type, reg_id)
if reg.is_written():
reg.analyze_write(f, tag, i)
else:
reg.analyze_read(f, i)
i += 1
reg.analyze_write(f, tag, regno)
has_generated_helper = not hex_common.skip_qemu_helper(
tag
@ -89,13 +99,13 @@ def main():
tagimms = hex_common.get_tagimms()
with open(sys.argv[-1], "w") as f:
f.write("#ifndef HEXAGON_TCG_FUNCS_H\n")
f.write("#define HEXAGON_TCG_FUNCS_H\n\n")
f.write("#ifndef HEXAGON_ANALYZE_FUNCS_C_INC\n")
f.write("#define HEXAGON_ANALYZE_FUNCS_C_INC\n\n")
for tag in hex_common.tags:
gen_analyze_func(f, tag, tagregs[tag], tagimms[tag])
f.write("#endif /* HEXAGON_TCG_FUNCS_H */\n")
f.write("#endif /* HEXAGON_ANALYZE_FUNCS_C_INC */\n")
if __name__ == "__main__":