[Bug target/81907] undefined reference to `memset'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81907
dongkyun.s at samsung dot com changed:
What|Removed |Added
Status|RESOLVED|UNCONFIRMED
Resolution|DUPLICATE |---
--- Comment #7 from dongkyun.s at samsung dot com ---
> Different tuning. Though maybe at -Os should be almost the same except for
> the allowance for using the instructions that are in cortex-a12 rather than
> a9 (for the -mcpu case).
I attached .o files made by '-mtune=cortex-a9' and 'mtune=cortex-a12' (same as
-mcpu case).
Could you describe more in detail about this why memset is added on cortex-a9
or below ?
memset_test_cortex-a9.o: file format elf32-littlearm
Disassembly of section .text:
...
0022 :
22: b51fpush{r0, r1, r2, r3, r4, lr}
24: 2210movsr2, #16
26: 2100movsr1, #0
28: 4668mov r0, sp
2a: f7ff fffe bl 0
> But really memset is part of the C standard here and you don't use
> -fno-hoisting option;
Which option do you mean? (I'm sorry, but, fno-hoisting is not found)
> Not a bug, see PR 63393 comment #5 for explanation of why.
This is not related to freestanding implementations. Again, option is different
by '-mcpu or -mtune' only.
(1) CFLAGS: -Os -mtune=cortex-a9
(CC) memset_test.o
(CC) main.o
gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-ld
-Bstatic -o memset_test \
memset_test.o main.o \
--start-group
-L/home/dongkyun.s/tmp/memset_test/gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabi/bin/../lib/gcc/arm-linux-gnueabi/6.3.1
-lgcc --end-group -Map memset_test.map #--gc-sections
memset_test.c:(.text+0x2a): undefined reference to `memset'
(2) CFLAGS: -Os -mtune=cortex-a12
(CC) memset_test.o
(CC) main.o
gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-ld
-Bstatic -o memset_test \
memset_test.o main.o \
--start-group
-L/home/dongkyun.s/tmp/memset_test/gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabi/bin/../lib/gcc/arm-linux-gnueabi/6.3.1
-lgcc --end-group -Map memset_test.map #--gc-sections
BUILD_TARGETS=memset_test.bin memset_test.txt memset_test.dis memset_test.ver
Build Done!
[Bug target/81907] undefined reference to `memset'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81907
--- Comment #6 from dongkyun.s at samsung dot com ---
Created attachment 42017
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42017=edit
obj made by '-Os -mtune=cortex-a12'
./gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-objdump
-d memset_test_cortex-a12.o
memset_test_cortex-a12.o: file format elf32-littlearm
Disassembly of section .text:
:
0: b530push{r4, r5, lr}
2: f1a0 0208 sub.w r2, r0, #8
6: 460cmov r4, r1
8: 2300movsr3, #0
a: 2000movsr0, #0
c: 2100movsr1, #0
e: 42a3cmp r3, r4
10: db00blt.n 14
12: bd30pop {r4, r5, pc}
14: f852 5f08 ldr.w r5, [r2, #8]!
18: 3301addsr3, #1
1a: 1940addsr0, r0, r5
1c: eb41 71e5 adc.w r1, r1, r5, asr #31
20: e7f5b.n e
0022 :
22: b51fpush{r0, r1, r2, r3, r4, lr}
24: 2200movsr2, #0
26: 490cldr r1, [pc, #48] ; (58 )
28: 2300movsr3, #0
2a: e9cd 2300 strdr2, r3, [sp]
2e: e9cd 2302 strdr2, r3, [sp, #8]
32: 780cldrbr4, [r1, #0]
34: 7908ldrbr0, [r1, #4]
36: 4623mov r3, r4
38: 4302orrsr2, r0
3a: e9cd 2300 strdr2, r3, [sp]
3e: 788aldrbr2, [r1, #2]
40: 2300movsr3, #0
42: 4668mov r0, sp
44: f043 0307 orr.w r3, r3, #7
48: 2102movsr1, #2
4a: e9cd 2302 strdr2, r3, [sp, #8]
4e: f7ff fffe bl 0
52: b004add sp, #16
54: bd10pop {r4, pc}
56: bf00nop
58: .word 0x
[Bug target/81907] undefined reference to `memset'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81907
dongkyun.s at samsung dot com changed:
What|Removed |Added
Attachment #42014|0 |1
is obsolete||
--- Comment #5 from dongkyun.s at samsung dot com ---
Created attachment 42016
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42016=edit
obj made by '-Os -mtune=cortex-a9'
./gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-objdump
-d memset_test_cortex-a9.o
memset_test_cortex-a9.o: file format elf32-littlearm
Disassembly of section .text:
:
0: b530push{r4, r5, lr}
2: f1a0 0208 sub.w r2, r0, #8
6: 460cmov r4, r1
8: 2300movsr3, #0
a: 2000movsr0, #0
c: 2100movsr1, #0
e: 42a3cmp r3, r4
10: db00blt.n 14
12: bd30pop {r4, r5, pc}
14: f852 5f08 ldr.w r5, [r2, #8]!
18: 3301addsr3, #1
1a: 1940addsr0, r0, r5
1c: eb41 71e5 adc.w r1, r1, r5, asr #31
20: e7f5b.n e
0022 :
22: b51fpush{r0, r1, r2, r3, r4, lr}
24: 2210movsr2, #16
26: 2100movsr1, #0
28: 4668mov r0, sp
2a: f7ff fffe bl 0
2e: 490aldr r1, [pc, #40] ; (58 )
30: 2200movsr2, #0
32: 780cldrbr4, [r1, #0]
34: 7908ldrbr0, [r1, #4]
36: 4623mov r3, r4
38: 4302orrsr2, r0
3a: 4668mov r0, sp
3c: e9cd 2300 strdr2, r3, [sp]
40: 2300movsr3, #0
42: 788aldrbr2, [r1, #2]
44: f043 0307 orr.w r3, r3, #7
48: 2102movsr1, #2
4a: e9cd 2302 strdr2, r3, [sp, #8]
4e: f7ff fffe bl 0
52: b004add sp, #16
54: bd10pop {r4, pc}
56: bf00nop
58: .word 0x
[Bug target/81907] undefined reference to `memset'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81907
--- Comment #4 from dongkyun.s at samsung dot com ---
Created attachment 42014
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42014=edit
memset_test_cortex-a9.o (made by '-Os -mtune=cortex-a12')
./gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-objdump
-d memset_test_cortex-a12.o
memset_test_cortex-a12.o: file format elf32-littlearm
Disassembly of section .text:
:
0: b530push{r4, r5, lr}
2: f1a0 0208 sub.w r2, r0, #8
6: 460cmov r4, r1
8: 2300movsr3, #0
a: 2000movsr0, #0
c: 2100movsr1, #0
e: 42a3cmp r3, r4
10: db00blt.n 14
12: bd30pop {r4, r5, pc}
14: f852 5f08 ldr.w r5, [r2, #8]!
18: 3301addsr3, #1
1a: 1940addsr0, r0, r5
1c: eb41 71e5 adc.w r1, r1, r5, asr #31
20: e7f5b.n e
0022 :
22: b51fpush{r0, r1, r2, r3, r4, lr}
24: 2200movsr2, #0
26: 490cldr r1, [pc, #48] ; (58 )
28: 2300movsr3, #0
2a: e9cd 2300 strdr2, r3, [sp]
2e: e9cd 2302 strdr2, r3, [sp, #8]
32: 780cldrbr4, [r1, #0]
34: 7908ldrbr0, [r1, #4]
36: 4623mov r3, r4
38: 4302orrsr2, r0
3a: e9cd 2300 strdr2, r3, [sp]
3e: 788aldrbr2, [r1, #2]
40: 2300movsr3, #0
42: 4668mov r0, sp
44: f043 0307 orr.w r3, r3, #7
48: 2102movsr1, #2
4a: e9cd 2302 strdr2, r3, [sp, #8]
4e: f7ff fffe bl 0
52: b004add sp, #16
54: bd10pop {r4, pc}
56: bf00nop
58: .word 0x
[Bug target/81907] undefined reference to `memset'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81907 Andrew Pinski changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #3 from Andrew Pinski --- Not a bug, see PR 63393 comment #5 for explanation of why. *** This bug has been marked as a duplicate of bug 63393 ***
[Bug target/81907] undefined reference to `memset'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81907 --- Comment #2 from Andrew Pinski --- (In reply to dongkyun.s from comment #0) > Found related issue in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888. Unrelated bug report.
[Bug target/81907] undefined reference to `memset'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81907 Andrew Pinski changed: What|Removed |Added Keywords|link-failure| Target|arm |arm-*-* Component|middle-end |target Host|x86 | Version|6.3.1 |unknown Build|x86 | --- Comment #1 from Andrew Pinski --- >What is different optimization behavior(implementation) in GCC between >cortex-a9 and cortex-a12 -given by mcpu or mtune option ? Different tuning. Though maybe at -Os should be almost the same except for the allowance for using the instructions that are in cortex-a12 rather than a9 (for the -mcpu case). But really memset is part of the C standard here and you don't use -fno-hoisting option; though IIRC that still requires memset being included in your libc.
