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[Chicken-janitors] #1556: Make inline files less expanded for the scruti
From: |
Chicken Trac |
Subject: |
[Chicken-janitors] #1556: Make inline files less expanded for the scrutinizer |
Date: |
Thu, 08 Nov 2018 11:24:38 -0000 |
#1556: Make inline files less expanded for the scrutinizer
-------------------------------------+-------------------------------------
Reporter: megane | Owner:
Type: enhancement | Status: new
Priority: not urgent at all | Milestone: someday
Component: compiler | Version: 5.0.0
Keywords: optimization | Estimated difficulty: hard
scrutinizer inline inlining |
-------------------------------------+-------------------------------------
In the following example take a look at the generated inline
definition for `foo` in module `mod`. The `(fixnum? x)` has been
turned into `(##core#inline ("C_fixnump") (##core#variable (x18)))`.
Now take a look at the two calls to `foo` in `main.scm`. If the
original definition of `foo` was inlined at the call sites the
scrutinizer could resolve the result statically in both cases. That is
`(foo 42)` inlined as `(if (fixnum? 42) 'fixnum 'not-fixnum)` could be
optimized to just `'fixnum`. This is something the scrutinizer already
can do.
The scrutinizer does not, however, know anything about the type of
`(##core#inline ("C_fixnump") (##core#variable (x18)))`, or any
`##core#inline` form for that matter (AFAIK). Therefore it cannot
optimize the predicate calls with the generated inline definition. You
can see that the predicate calls are indeed present in the optimized
expression tree of the compiled program.
{{{
$ ./run.sh
::::::::::::::
run.sh
::::::::::::::
#!/usr/bin/env bash
set -e
set -o pipefail
more run.sh src/*.scm | cat
echo "### BUILD ###"
rm -rf build
mkdir -p build
cd build
csc -s -inline-global -J -O3 -oi mod.inline ../src/mod.scm -o mod.so
csc -debug 7 -O3 -inline -consult-inline-file mod.inline ../src/main.scm
-o main
more *.import.scm *.inline | cat
./main
::::::::::::::
src/main.scm
::::::::::::::
(cond-expand
(chicken-5 (import mod))
(else (use mod)))
(print (foo 42))
(print (foo 'abcd))
::::::::::::::
src/mod.scm
::::::::::::::
(module
mod
(foo)
(import scheme)
(cond-expand
(chicken-5 (import (chicken base)))
(else (import chicken)))
(define (foo x)
(if (fixnum? x)
'fixnum
'not-fixnum))
)
### BUILD ###
[optimized]
(lambda (k129)
(let ((k130 (##core#lambda
(r131)
(let ((k133 (##core#lambda
(r134)
(let ((k136 (##core#lambda
(r137)
(let ((k139 (##core#lambda
(r140)
(let ((k142
(##core#lambda
(r143)
(let ((k145 (##core#lambda
(r146)
(let ((k151 (##core#lambda (r152) (r152 k129))))
(chicken.base#implicit-exit-handler k151)))))
(let ((r142164 (##core#inline "C_fixnump" 'abcd)))
(let ((r156168
(##core#cond r142164 'fixnum 'not-fixnum)))
(chicken.base#print k145 r156168)))))))
(let ((r142167
(##core#inline "C_fixnump" 42)))
(let
((r160169
(##core#cond r142167 'fixnum 'not-fixnum)))
(chicken.base#print k142 r160169)))))))
(chicken.load#load-extension
k139
'mod
'(mod#)
'require)))))
(##core#callunit expand k136)))))
(##core#callunit eval k133)))))
(##core#callunit library k130)))
::::::::::::::
mod.import.scm
::::::::::::::
;;;; mod.import.scm - GENERATED BY CHICKEN 5.0.0rc4 -*- Scheme -*-
(##sys#register-compiled-module
'mod
'mod
(scheme#list)
'((foo . mod#foo))
(scheme#list)
(scheme#list))
;; END OF FILE
::::::::::::::
mod.inline
::::::::::::::
; GENERATED BY CHICKEN 5.0.0rc4 FROM ../src/mod.scm
(mod#foo
(##core#lambda
(f_136 #t (k137 x18) 10)
(let (r142)
(##core#inline ("C_fixnump") (##core#variable (x18)))
(##core#call
(#t)
(##core#variable (k137))
(##core#cond () (##core#variable (r142)) '(fixnum) '(not-
fixnum))))))
; END OF FILE
fixnum
not-fixnum
}}}
--
Ticket URL: <https://bugs.call-cc.org/ticket/1556>
CHICKEN Scheme <https://www.call-cc.org/>
CHICKEN Scheme is a compiler for the Scheme programming language.
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