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Add -fdata-sections, which is a new GCC 2.95 optimization. Remove 

-fschedule-insns as it wasn't such a big win with 2.95 after all.

Add the *BIG* win "-mpreferred-stack-boundary=2" optimiztion submitted by
Dima.  GCC 2.95 ensures the stack frame is always properly [opitimally]
aligned by surrounding every function call by code simular to
"addl $-12, %esp" / "addl $12, %esp".  Here we need the reduction in space,
with speed not an issue.
This commit is contained in:
David E. O'Brien 1999-11-15 04:23:40 +00:00
parent eb33411e9b
commit c8e02dfe73
2 changed files with 4 additions and 2 deletions
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3
sys/boot/i386/boot2/Makefile
View File

@ -28,8 +28,9 @@ ORG1= 0x7c00
ORG2= 0x1000
CFLAGS= -elf -I${.CURDIR}/../btx/lib -I. \
-Os -fno-builtin -fforce-addr -fschedule-insns \
-Os -fno-builtin -fforce-addr -fdata-sections \
-malign-functions=0 -malign-jumps=0 -malign-loops=0 -mrtd \
-mpreferred-stack-boundary=2 \
-Wall -Waggregate-return -Wbad-function-cast -Wcast-align \
-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings

3
sys/boot/i386/gptboot/Makefile
View File

@ -28,8 +28,9 @@ ORG1= 0x7c00
ORG2= 0x1000
CFLAGS= -elf -I${.CURDIR}/../btx/lib -I. \
-Os -fno-builtin -fforce-addr -fschedule-insns \
-Os -fno-builtin -fforce-addr -fdata-sections \
-malign-functions=0 -malign-jumps=0 -malign-loops=0 -mrtd \
-mpreferred-stack-boundary=2 \
-Wall -Waggregate-return -Wbad-function-cast -Wcast-align \
-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings