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Hexagon (target/hexagon) Enable more short-circuit packets (HVX)

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Look for read-after-write instead of overlap of reads and writes

HVX instructions with helpers have pass-by-reference semantics, so
we check for overlaps of reads and writes within the same instruction.

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20240201103340.119081-4-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
This commit is contained in:
Taylor Simpson 2024-02-01 03:33:40 -07:00 • committed by Brian Cain
parent bd983f68ac
commit 763d2ce7c4
4 changed files with 115 additions and 95 deletions
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19
target/hexagon/gen_analyze_funcs.py
View file

@ -43,6 +43,16 @@ def gen_analyze_func(f, tag, regs, imms):
f.write("{\n")
f.write(" Insn *insn G_GNUC_UNUSED = ctx->insn;\n")
if (hex_common.is_hvx_insn(tag)):
if hex_common.has_hvx_helper(tag):
f.write(
" const bool G_GNUC_UNUSED insn_has_hvx_helper = true;\n"
)
f.write(" ctx_start_hvx_insn(ctx);\n")
else:
f.write(
" const bool G_GNUC_UNUSED insn_has_hvx_helper = false;\n"
)
## Declare all the registers
for regno, register in enumerate(regs):
@ -64,15 +74,6 @@ def gen_analyze_func(f, tag, regs, imms):
if reg.is_written():
reg.analyze_write(f, tag, regno)
has_generated_helper = not hex_common.skip_qemu_helper(
tag
) and not hex_common.is_idef_parser_enabled(tag)
## Mark HVX instructions with generated helpers
if (has_generated_helper and
"A_CVI" in hex_common.attribdict[tag]):
f.write(" ctx->has_hvx_helper = true;\n")
f.write("}\n\n")