------- Comment #8 from rob1weld at aol dot com 2009-01-31 21:01 -------
Sometimes you can skirt around the "GENERAL_REGS" error with other options.
When I use "-O0", "-O1", "-O2", "-O3", "-Os" I get different results.
Using "-O0" produces no screen output _or_ compiled file (thus it 'looks'
as though it compiled OK).
# gcc -ffloat-store -msse3 -mssse3 -m3dnow -msse4.1 -mfpmath=sse,387
-I./../arch/386 -I. -Wall -O0 -fomit-frame-pointer -fforce-addr -DHAVE_CONFIG_H
-DFORCE_LL -DFORCE_REG
-DDEFAULTPATH='".:/usr/local/lib/gforth/site-forth:/usr/local/share/gforth/site-forth:/usr/local/lib/gforth/0.7.0:/usr/local/share/gforth/0.7.0"'
-fexceptions -fno-gcse -fno-strict-aliasing -fno-crossjumping
-fno-reorder-blocks -falign-labels=1 -falign-loops=1 -falign-jumps=1
-fno-defer-pop -fcaller-saves -fno-inline -o engine-fast-ll-reg.o -c ./engine.c
#
# ls -lrtA | tail -1
-rwxr-xr-x 1 root root 126938 Jan 31 12:20 gforth-fast-ll
#
See that "-O0" gives no screen output and no compiled file output.
# gcc -ffloat-store -msse3 -mssse3 -m3dnow -msse4.1 -mfpmath=sse,387
-I./../arch/386 -I. -Wall -O1 -fomit-frame-pointer -fforce-addr -DHAVE_CONFIG_H
-DFORCE_LL -DFORCE_REG
-DDEFAULTPATH='".:/usr/local/lib/gforth/site-forth:/usr/local/share/gforth/site-forth:/usr/local/lib/gforth/0.7.0:/usr/local/share/gforth/0.7.0"'
-fexceptions -fno-gcse -fno-strict-aliasing -fno-crossjumping
-fno-reorder-blocks -falign-labels=1 -falign-loops=1 -falign-jumps=1
-fno-defer-pop -fcaller-saves -fno-inline -o engine-fast-ll-reg.o -c ./engine.c
./engine.c: In function 'gforth_engine':
./engine.c:460: error: unable to find a register to spill in class 'DIREG'
./engine.c:460: error: this is the insn:
(insn 5800 13080 5801 850 prim:1699 (parallel [
(set (reg:SI 2 cx [2364])
(unspec:SI [
(mem:BLK (reg/f:SI 1 dx [orig:2366 D.8048 ] [2366]) [0
A8])
(reg:QI 0 ax [2368])
(const_int 1 [0x1])
(reg:SI 2 cx [2367])
] 30))
(clobber (reg/f:SI 1 dx [orig:2366 D.8048 ] [2366]))
(clobber (reg:CC 17 flags))
]) 864 {*strlenqi_1} (expr_list:REG_DEAD (reg:QI 0 ax [2368])
(expr_list:REG_DEAD (reg:SI 2 cx [2367])
(expr_list:REG_DEAD (reg/f:SI 1 dx [orig:2366 D.8048 ] [2366])
(expr_list:REG_UNUSED (reg/f:SI 1 dx [orig:2366 D.8048 ]
[2366])
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil)))))))
./engine.c:460: confused by earlier errors, bailing out
#
# gcc -ffloat-store -msse3 -mssse3 -m3dnow -msse4.1 -mfpmath=sse,387
-I./../arch/386 -I. -Wall -O3 -fomit-frame-pointer -fforce-addr -DHAVE_CONFIG_H
-DFORCE_LL -DFORCE_REG
-DDEFAULTPATH='".:/usr/local/lib/gforth/site-forth:/usr/local/share/gforth/site-forth:/usr/local/lib/gforth/0.7.0:/usr/local/share/gforth/0.7.0"'
-fexceptions -fno-gcse -fno-strict-aliasing -fno-crossjumping
-fno-reorder-blocks -falign-labels=1 -falign-loops=1 -falign-jumps=1
-fno-defer-pop -fcaller-saves -fno-inline -o engine-fast-ll-reg.o -c ./engine.c
./engine.c: In function 'gforth_engine':
./engine.c:460: error: unable to find a register to spill in class
'GENERAL_REGS'
./engine.c:460: error: this is the insn:
(insn:HI 2564 2563 2565 367 prim-fast.i:4090 (set (reg:DI 2196)
(mem/s/j/c:DI (plus:SI (reg/f:SI 20 frame)
(const_int -180 [0xffffffffffffff4c])) [0 _d.d+0 S8 A32])) 88
{*movdi_2} (nil))
./engine.c:460: confused by earlier errors, bailing out
#
# gcc -ffloat-store -msse3 -mssse3 -m3dnow -msse4.1 -mfpmath=sse,387
-I./../arch/386 -I. -Wall -Os -fomit-frame-pointer -fforce-addr -DHAVE_CONFIG_H
-DFORCE_LL -DFORCE_REG
-DDEFAULTPATH='".:/usr/local/lib/gforth/site-forth:/usr/local/share/gforth/site-forth:/usr/local/lib/gforth/0.7.0:/usr/local/share/gforth/0.7.0"'
-fexceptions -fno-gcse -fno-strict-aliasing -fno-crossjumping
-fno-reorder-blocks -falign-labels=1 -falign-loops=1 -falign-jumps=1
-fno-defer-pop -fcaller-saves -fno-inline -o engine-fast-ll-reg.o -c ./engine.c
./engine.c: In function 'gforth_engine':
./engine.c:460: error: unable to find a register to spill in class 'DIREG'
./engine.c:460: error: this is the insn:
(insn:HI 1623 1621 1624 230 prim:662 (parallel [
(set (reg:SI 2 cx [orig:2148 u ] [2148])
(const_int 0 [0x0]))
(set (reg/f:SI 0 ax [orig:2146 c_addr ] [2146])
(plus:SI (reg/v/f:SI 1943 [ c_addr ])
(reg/v:SI 2 cx [orig:1942 u ] [1942])))
(set (mem:BLK (reg/v/f:SI 1943 [ c_addr ]) [0 A8])
(const_int 0 [0x0]))
(use (subreg:QI (reg:SI 1 dx [orig:1278 spTOS.757 ] [1278]) 0))
(use (reg/v:SI 2 cx [orig:1942 u ] [1942]))
]) 858 {*rep_stosqi} (expr_list:REG_DEAD (reg/v/f:SI 1943 [ c_addr ])
(expr_list:REG_DEAD (reg/v:SI 2 cx [orig:1942 u ] [1942])
(expr_list:REG_DEAD (reg:SI 1 dx [orig:1278 spTOS.757 ] [1278])
(expr_list:REG_UNUSED (reg:SI 2 cx [orig:2148 u ] [2148])
(expr_list:REG_UNUSED (reg/f:SI 0 ax [orig:2146 c_addr ]
[2146])
(nil)))))))
./engine.c:460: confused by earlier errors, bailing out
#
If I compile "-O1" and remove the "-fomit-frame-pointer" option then the
output (error message) is the same as: "-O1 -fomit-frame-pointer".
If I compile "-Os" and remove the "-fomit-frame-pointer" option then the
output (error message) is the same as: "-Os -fomit-frame-pointer".
If I compile "-O0", "-O2" or "-O3" and remove the "-fomit-frame-pointer"
option then the output (error message) is the same as if I had used:
"-O2 -fomit-frame-pointer".
Even stripping the gcc command to the bare minimum can not skirt
the lack of enough registers to compile this code:
# gcc -I./../arch/386 -I. -Wall -DHAVE_CONFIG_H -DFORCE_LL -DFORCE_REG
-DDEFAULTPATH='".:/usr/local/lib/gforth/site-forth:/usr/local/share/gforth/site-forth:/usr/local/lib/gforth/0.7.0:/usr/local/share/gforth/0.7.0"'
-o engine-fast-ll-reg.o -c ./engine.c
./engine.c: In function 'gforth_engine':
./engine.c:460: error: unable to find a register to spill in class
'GENERAL_REGS'
./engine.c:460: error: this is the insn:
(insn 3333 3332 3334 360 prim-fast.i:3818 (set (reg:DI 4692)
(mem/s/j/c:DI (plus:SI (reg/f:SI 20 frame)
(const_int -4844 [0xffffffffffffed14])) [0 _d.d+0 S8 A32])) 88
{*movdi_2} (nil))
./engine.c:460: confused by earlier errors, bailing out
Thanks,
Rob
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35135
