Avr-gcc Bugs

2013-02-25T10:59:01Z

0:0:0:FFFF:84:58:199:215: /* Bugs */

== Bugs ==

{| {{Tabelle}} border="1" class="sortable" id="t4"
!PR||Description||Note
|-
| [http://gcc.gnu.org/PR56442 56442] || postreload uses clobbered register
|
|-
| '''''[http://gcc.gnu.org/bugzilla/showdependencytree.cgi?id=56183 56183]'''''
| ''Problems with register allocation''
| meta-bug
|-
| [http://gcc.gnu.org/PR56164 56164] || ICE: spill fail with __flash keyword
|
|-
| [http://gcc.gnu.org/PR54330 54330] || Wrong optimization for code from fixed-bit.c
|
|-
| [http://gcc.gnu.org/PR53615 53615] || Buffer overflow in the compiler?
|
|-
| [http://gcc.gnu.org/PR53372 53372] || Section attribute ignored with address space
|
|-
| [http://gcc.gnu.org/PR52663 52663] || ICE: in purge_dead_edges, at cfgrtl.c:2462
|
|-
| [http://gcc.gnu.org/PR52472 52472] || ICE: in convert_debug_memory_address, at cfgexpand.c (__memx)
| -g
|-
| [http://gcc.gnu.org/PR52305 52305] || ICE: in avr_print_operand: unknown mode (const_double)
| asm
|-
| '''[http://gcc.gnu.org/PR50925 50925]''' || ICE: spill failure in newlib build
|
|-
| [http://gcc.gnu.org/PR50807 50807] || Constructor writing to RAM for variable in Flash
|
|-
| [http://gcc.gnu.org/PR50739 50739] || nameless error with -fmerge-all-constants
|
|-
| [http://gcc.gnu.org/PR49775 49775] || ICE: in based_loc_descr
| dwarf-2
|-
| '''[http://gcc.gnu.org/PR42204 42204]''' || update_eliminables should be called in reload after something changes
|
|-
| [http://gcc.gnu.org/PR36571 36571] || Default untyped return for AVR is byte register.
|
|}

== Binutils / avr-libc ==

{| {{Tabelle}} border="1" class="sortable" id="t4"
!PR||Description||Note
|-
!colspan="3"| binutils
|-
| [http://sourceware.org/PR15043 15043] || Support -mdes and -matomics
|
|-
| [http://sourceware.org/PR14406 14406] || Support .progmem<N>.data sections in the default ld script
|
|-
| [http://sourceware.org/PR13812 13812] || .trampolines location in linker script cause "internal error: out of range error"
|
|-
| [http://sourceware.org/PR12494 12494] || Relaxation leads to wrong code optimization
|
|-
!colspan="3"| binutils fixed
|-
| [http://sourceware.org/PR14058 14058] || Internal overflow error on > 128kB flash
| 2.23
|-
| '''[http://sourceware.org/PR13899 13899]''' || Wrong relaxation of R_AVR_16_PM with gs()
| 2.23
|-
| '''[http://sourceware.org/PR13697 13697]''' || Wrong symbol values with --gc-sections and empty .data
| 2.23
|-
| [http://sourceware.org/PR13503 13503] || Support RELOCs to represent a byte
| 2.23
|-
| [http://sourceware.org/PR13410 13410] || Relocation truncated to fit: R_AVR_13_PCREL against symbol...
| 2.23
|-
| [http://sourceware.org/PR12742 12742] || mingw32 and --enable-lto in Canadian cross build
| 2.23
|-
| [http://sourceware.org/PR12161 12161] || Unconforming ELF file causes SIGSEGV in avr-ld
| 2.23, 2.22.x
|-
!colspan="3"| avr-libc
|-
| [http://savannah.nongnu.org/bugs/?38135 38135] || Install stdfix-avrlibc.h
|
|-
| [http://savannah.nongnu.org/bugs/?38125 38125] || Distribute gcrt1.S
|
|-
| [http://savannah.nongnu.org/bugs/?36571 36571] || stdint.h: INTn_C not standard compliant
|
|-
| [http://savannah.nongnu.org/bugs/?36454 36454] || string.h: Error for long long in C90
| 1.8.1
|-
| '''[http://savannah.nongnu.org/bugs/?35407 35407]''' || Missing multilib versions for tiny-stack targets
|
|-
| [http://savannah.nongnu.org/bugs/?34695 34695] || stdint.h ixed-width int types without __attribute__((mode))
|
|-
| [http://savannah.nongnu.org/bugs/?33698 33698] || RJMP/RCALL can cause "relocation truncated to fit: R_AVR_13_PCREL" linker error
|
|}

== Optimierung ==

{| {{Tabelle}} border="1" class="sortable" id="t2"
! PR || Optimization || Note
|-
| [http://gcc.gnu.org/PR55181 55181] || Expensive shift loop instead of bit-testing instruction
|
|-
| [http://gcc.gnu.org/PR54816 54816] ||shift is better than widening mul
|
|-
| [http://gcc.gnu.org/PR54378 54378] || Code bloat for long << shifts
|
|-
| '''[http://gcc.gnu.org/PR53049 53049]''' || expand/TER unappropriate moving unspec volatile
| middle-end
|-
| [http://gcc.gnu.org/PR52664 52664] || gcc.dg/tree-ssa/pr31261.c fails
| ssa
|-
| [http://gcc.gnu.org/PR52278 52278] || inefficient register allocation for SUBREGs
| RA
|-
| [http://gcc.gnu.org/PR52025 52025] || <tt>-fcaller-saves</tt> triggers a frame without need
| RA
|-
| [http://gcc.gnu.org/PR49807 49807] || Missed byte (subreg) extraction when storing to volatile mem
|
|-
| [http://gcc.gnu.org/PR49491 49491] || Superfluous move because of unnecessary spill for 2-operand insn
| RA
|-
| [http://gcc.gnu.org/PR41076 41076] || pessimal code for logical OR of 8-bit fields
| TODO, patch upstream
|-
| [http://gcc.gnu.org/PR39760 39760] || register allocation costs are not well described on AVR
|
|-
| [http://gcc.gnu.org/PR38629 38629] || target-specific parameters for inline heuristics not defined for AVR
|
|-
| [http://gcc.gnu.org/PR36884 36884] || ifcvt poor optimization
| RTL-optimize, -fno-if-conversion
|-
| [http://gcc.gnu.org/PR36561 36561] || store using long array index not hoisted out of loop
|
|-
| [http://gcc.gnu.org/PR30908 30908] || tree cost for types which are > WORD_SIZE
|
|-
| [http://gcc.gnu.org/PR27663 27663] || missed-optimization transforming a byte array to unsigned long
| patch upstream
|-
| [http://gcc.gnu.org/PR20296 20296] || Speeding up small interrupts
|-
| [http://gcc.gnu.org/PR18065 18065] || usual arithmetic conversion not applying correctly
|
|-
| [http://gcc.gnu.org/PR11180 11180] || Optimization decrease performance of struct assignment.
|
|-
| [http://gcc.gnu.org/PR3507 3507] || appalling optimisation with sub/cmp on multiple targets
|
|}

== Debug-Info, Build, ... ==

{| {{Tabelle}} border="1" class="sortable" id="t3"
!PR||Debug-Info, Build, Ada, Fortran||Note
|}

== Erweiterungen ==

{| {{Tabelle}} border="1" class="sortable" id="t5"
! PR || Extensions || Note
|-
| [http://gcc.gnu.org/PR56263 56263] || Strict address-space checking
|
|-
| [http://gcc.gnu.org/PR49857 49857] || Put constant switch-tables into flash
|
|-
| [http://gcc.gnu.org/PR43745 43745] || Put VTABLES in Flash
|
|}

== Ungültig ==

{| {{Tabelle}} border="1"
! PR || Invalid || Note
|-
| [http://gcc.gnu.org/PR52474 52474] || mulhisi3: arithmetics produce completely wrong result
| → Caused by patch from Atmel
|-
|colspan="3" align="center"| 
|-
! PR || Won't fix || Note
|-
| [http://gcc.gnu.org/PR56254 56254] || Support __builtin_avr_delay_cycles with non-const delays
|
|-
| [http://gcc.gnu.org/PR38342 38342] || __attribute__((__progmem__)) not propagated from typedef to data
| → [http://savannah.nongnu.org/bugs/?33716 avr-libc #33716]
|-
| [http://gcc.gnu.org/PR38549 38549] || eicall not properly set for > 128K program space
| → [http://gcc.gnu.org/PR50820 50820]
|}

== Fixed ==

{| {{Tabelle}} border="1" class="sortable" id="t7"
! PR || Fixed || Note
|-
| [http://gcc.gnu.org/PR56064 56064] || Fold VIEW_CONVERT_EXPR with FIXED_CST
| 4.8.0 tree-ssa
|-
| [http://gcc.gnu.org/PR54814 54814] || ICE: Hundreds of spill fails in test suite for class R0_REG
| 4.8.0.
|-
| [http://gcc.gnu.org/PR54854 54854] || Remove <tt>-mshort-calls</tt> option
| 4.8.0
|-
| [http://gcc.gnu.org/PR54815 54815] || missed optimization with operations with constant operands
| 4.8.0
|-
| [http://gcc.gnu.org/PR54222 54222] || ISO/IEC TR 18037 fixed-point support
| 4.8.0
|-
| [http://gcc.gnu.org/PR53344 53344] || Assemble 3-byte symbols
| 4.8.0
|-
|colspan="3" align="center"| 
|-
| [http://gcc.gnu.org/PR55974 55974] || Wrong suffix for __INT24_MAX__, __UINT24_MAX__ with -mint8
| 4.7.3
|-
| [http://gcc.gnu.org/PR55897 55897] || Allocate __memx data to .progmemx.data
| 4.7.3
|-
| [http://gcc.gnu.org/PR55243 55243] || [ada] STAMP variable is not defined in t-avr
| 4.7.3
|-
| [http://gcc.gnu.org/PR54536 54536] || Incorrect library_name for at90usb1287
| 4.7.2, 4.6.4
|-
| [http://gcc.gnu.org/PR54476 54476] || Time/memory hog with __builtin_avr_delay_cycles (-1ul) on 64-bit hosts
| 4.7.2
|-
| '''[http://gcc.gnu.org/PR54461 54461]''' || Add configure option for better AVR-Libc integration
| 4.7.2
|-
| [http://gcc.gnu.org/PR54220 54220] || Naked functions need frame at -O0
| 4.7.2, 4.6.4
|-
| '''[http://gcc.gnu.org/PR53595 53595]''' || Code size increase of +10% between two 4.7.1 snapshots
| 4.7.2
|-
| [http://gcc.gnu.org/PR53448 53448] || __attribute__((aligned(2))) ignored
| 4.7.1
|-
| '''[http://gcc.gnu.org/PR53256 53256]''' || Attribute 'interrupt' shall override attribute 'signal'
| 4.7.1
|-
| [http://gcc.gnu.org/PR53065 53065] || ICE: in replace_reg_with_saved_mem, at caller-save.c:1125
| 4.7.1
|-
| '''[http://gcc.gnu.org/PR53033 53033]''' || Wrong register number for 3-byte loads via X
| 4.7.1
|-
| '''[http://gcc.gnu.org/PR52737 52737]''' || -mtiny-stack shall not influence multilib selection
| 4.7.1
|-
| [http://gcc.gnu.org/PR52692 52692] || Add support for avr-specific built-ins + LTO
| 4.7.1
|-
| [http://gcc.gnu.org/PR52545 52545] || SECTION_EXCLUDE flag clobbers SECTION_MACH_DEP
| 4.7.1 other
|-
| '''[http://gcc.gnu.org/PR52543 <span style="background:red; color:white">52543</span>]'''
| lower-subreg.c: code bloat of 300%-400% for multi-word memory splits
| <span style="background:red; color:white">'''HACK'''</span> 4.7.1 middle-end
|-
| [http://gcc.gnu.org/PR52508 52508] || HAVE_RAMPZ as condition to set RAMPZ prior to flash-read is no more appropriate
| 4.7.1
|-
| [http://gcc.gnu.org/PR52507 52507] || movmem loop for __memx address space uses wrong loop label
| 4.7.1
|-
| [http://gcc.gnu.org/PR52506 52506] || XMEGA: Wrong order of save/restore of RAMPX/Y/Z/D SFRs in ISR pro-/epilogue
| 4.7.1
|-
| [http://gcc.gnu.org/PR52505 52505] || __memx address space reading unintentionally from RAM
| 4.7.1
|-
| [http://gcc.gnu.org/PR52496 52496] || avr-specific built-ins missing memory barrier
| 4.7.1
|-
| [http://gcc.gnu.org/PR52488 52488] || ICE: unreconizable addqi -2000 insn
| 4.7.1
|-
| [http://gcc.gnu.org/PR52484 52484] || Missing __memx insn because of wrong register footprint
| 4.7.1
|-
| [http://gcc.gnu.org/PR52461 52461] || XMEGA+EBI: RAMPZ clobbered
| 4.7.1
|-
| '''[http://gcc.gnu.org/PR51527 51527]''' || ICE: 'convert_to_integer' enters infinite recursion for __int24
| 4.7.1 c
|-
| [http://gcc.gnu.org/PR46261 46261] || ICE: when compiled with -mint8
| 4.7.1, 4.6.4, 4.5.4
|-
| [http://gcc.gnu.org/PR52261 52261] || Add XMEGA support
| 4.7.0
|-
| [http://gcc.gnu.org/PR52148 52148] ||ICE: spill_failure for movmemhi
| 4.7.0
|-
| '''[http://gcc.gnu.org/PR51782 51782]''' || Missing address-space information leads to wrong code
| 4.7.0 middle-end
|-
| [http://gcc.gnu.org/PR51425 51425] || no SBIS/SBIC instructions
| 4.7.0
|-
| '''[http://gcc.gnu.org/PR51409 51409]''' || Building avr-gcc fails if configured for other languages than from C family
| 4.7.0
|-
| [http://gcc.gnu.org/PR51345 51345] || Devices with 8-bit SP need their own multilib(s)
| 4.7.0 ABI
|-
| [http://gcc.gnu.org/PR51050 51050] || ICE: invalid rtl sharing found in the insn (ATtiny26)
| 4.7.0
|-
| [http://gcc.gnu.org/PR51002 51002] || SP_H register is used even on targets that do not have it (ATtiny26)
| 4.7.0
|-
| [http://gcc.gnu.org/PR50931 50931] || Support a 24-bit scalar integer mode
| 4.7.0
|-
| [http://gcc.gnu.org/PR50910 50910] || Inefficient division by 2
| 4.7.0
|-
| [http://gcc.gnu.org/PR50887 50887] || Support ACCUMULATE_OUTGOING_ARGS
| 4.7.0
|-
| '''[http://gcc.gnu.org/PR50775 50775]''' || Register allocator sets up frame and frame pointer with low register pressure
| 4.7.0, ra
|-
| [http://gcc.gnu.org/PR50616 50616] || ICE: lto1.exe: invalid resolution in the resolution file
| 4.7.0, lto, mingw32
|-
| [http://gcc.gnu.org/PR50566 50566] || Add support for better logging by means of -mlog=
| 4.7.0
|-
| [http://gcc.gnu.org/PR50465 50465] || Use insn attribute to depict if and how instruction lengths have to be adjusted
| 4.7.0
|-
| [http://gcc.gnu.org/PR50449 50449] || Loading some 32-bit constants not optimal
| 4.7.0
|-
| [http://gcc.gnu.org/PR50448 50448] || Missed optimization accessing struct component with integer address
| 4.7.0 middle-end
|-
| [http://gcc.gnu.org/PR50447 50447] || Better support of AND, OR, XOR and PLUS with constant integers
| 4.7.0
|-
| [http://gcc.gnu.org/PR50446 50446] || Implement rotate patterns with offset 1
| 4.7.0
|-
| [http://gcc.gnu.org/PR50358 50358] || Implement [u]maddqihi4 [u]msubqihi4 patterns
| 4.7.0
|-
| '''[http://gcc.gnu.org/PR50063 50063]''' || wrong code for gcc.dg/torture/pta-ptrarith-3.c
| 4.7.0
|-
| [http://gcc.gnu.org/PR49939 49939] || Skip 2-word instructions if applicable
| 4.7.0
|-
| [http://gcc.gnu.org/PR49903 49903] || Redundant comparisons in binary-seach switch/case expansion
| 4.7.0 FIXME
|-
| [http://gcc.gnu.org/PR49881 49881] || Inefficient stack manipulation around calls
| 4.7.0
|-
| '''[http://gcc.gnu.org/PR49868 49868]''' || Implement named address space to place/access data in flash memory
| 4.7.0 ← [http://sourceware.org/PR13503 binutils PR13503]
|-
| [http://gcc.gnu.org/PR49864 49864] || ICE: in maybe_record_trace_start, at dwarf2cfi.c:2439
| 4.7.0
|-
| [http://gcc.gnu.org/PR49687 49687] || Missed optimization for widening MUL
| 4.7.0 ABI
|-
| [http://gcc.gnu.org/PR49313 49313] || Inefficient libgcc implementations for avr
| 4.7.0 ABI
|-
| [http://gcc.gnu.org/PR47597 47597] || ICE: call frame debugging information is not handled when case is post_dec
| 4.7.0
|-
| '''[http://gcc.gnu.org/PR46278 46278]''' || avr-gcc 4.5.1 doing suboptimal reloads using X
| 4.7.0
|-
| [http://gcc.gnu.org/PR45099 45099] || Warning could be issued for use of register variables that will fail.
| 4.7.0
|-
| [http://gcc.gnu.org/PR43746 43746] || -fmerge-constants and -fmerge-all-constants don't work at AVR target
| 4.7.0
|-
| [http://gcc.gnu.org/PR42210 42210] || optimizing assignment to a bit field
| 4.7.0
|-
| [http://gcc.gnu.org/PR39621 39621] || Delaying operation to end of function causes high stack usage
| 4.7.0
|-
| [http://gcc.gnu.org/PR36467 36467] || Missed optimization with pointer arithmetic and mul*
| 4.7.0
|-
| [http://gcc.gnu.org/PR35860 35860] || [4.3/4.4/4.5/4.6 Regression] [avr] code bloat caused by -fsplit-wide-types
| 4.7.0
|-
| [http://gcc.gnu.org/PR34888 34888] || Stack patterns not optimal
| 4.7.0
|-
| [http://gcc.gnu.org/PR34792 34792] || c++ worse than c compiler at 8-bit optimisations
| 4.7.0
|-
| [http://gcc.gnu.org/PR34791 34791] || optimisation of 8-bit logic sometimes fails
| 4.7.0
|-
| [http://gcc.gnu.org/PR34790 34790] || no sibling call optimisation
| 4.7.0
|-
| [http://gcc.gnu.org/PR34789 34789] || sometimes the compiler keeps addresses in registers unnecessarily
| 4.7.0
|-
| [http://gcc.gnu.org/PR33049 33049] || bit extraction non optimal, inversing logic solves problem
| 4.7.0
|-
| [http://gcc.gnu.org/PR29560 29560] || Poor optimization for byte shifts
| 4.7.0
|-
| [http://gcc.gnu.org/PR29524 29524] || [4.3/4.4/4.5/4.6 Regression] Too much RAM used: __clz_tab[] linked
| 4.7.0
|-
| [http://gcc.gnu.org/PR18145 18145] || Do not emit __do_copy_data or __do_clear_bss if .data or .bss is empty.
| 4.7.0
|-
| [http://gcc.gnu.org/PR17994 17994] || avr-gcc does not output a dwarf2 .debug_frame section
| 4.7.0
|-
|colspan="3" align="center"| 
|-
| [http://gcc.gnu.org/PR52741 52741] || -mtiny-stack must not make assumptions on upper 8 bits of SP/FP
| 4.6.4
|-
| [http://gcc.gnu.org/PR51756 51756] || Wrong warning: uninitialized variable put into program memory area
| 4.6.3
|-
| '''[http://gcc.gnu.org/PR51374 51374]''' || insn combine reorders volatile memory accesses
| 4.6.3 middle-end
|-
| '''[http://gcc.gnu.org/PR50820 50820]''' || Use EIND consistently
| 4.6.2, 4.5.4
|-
| [http://gcc.gnu.org/PR50816 50816] || Discriminators are emitted in DWARF 2 format
| 4.6.2
|-
| '''[http://gcc.gnu.org/PR50652 50652]''' || Incorrect data start value for ATmega164A
| 4.6.2
|-
| [http://gcc.gnu.org/PR50289 50289] || call-prologues saving/restoring global register variables
| 4.6.2
|-
| [http://gcc.gnu.org/PR49824 49824] || Missing documentation for OS_task and OS_main attributes
| 4.6.2
|-
| [http://gcc.gnu.org/PR49764 49764] || [avr-g++] Rejects attribute progmem
| 4.6.2
|-
| [http://gcc.gnu.org/PR49487 49487] || ICE: bytewise rotate
| 4.6.2
|-
| '''[http://gcc.gnu.org/PR46779 46779]''' || wrong code generation for values held in R28/R29
| 4.6.2, 4.5.4
|-
| [http://gcc.gnu.org/PR34734 34734] || attribute((progmem)) not handled properly in C++ for AVRs
| 4.6.2 → [http://savannah.nongnu.org/bugs/?33716 avr-libc #33716]
|-
| [http://gcc.gnu.org/PR44643 44643] || ICE: in c-typeck.c
| 4.6.2 → [http://savannah.nongnu.org/bugs/?32988 avr-libc #32988]
|-
| '''[http://gcc.gnu.org/PR39633 39633]''' || missing 8-bit comparison (*cmpqi)
| 4.6.2, 4.5.4
|-
| [http://gcc.gnu.org/PR39386 39386] || different computation results for O1 and O0 executables
| 4.6.2
|-
| [http://gcc.gnu.org/PR48459 48459] || [4.6/4.7 Regression] avr: Assertion failure with -gdwarf-2
| 4.6.1
|-
| '''[http://gcc.gnu.org/PR45263 45263]''' || registers used in __do_global_ctors can get clobbered
| 4.6.1, 4.5.4
|-
|colspan="3" align="center"| 
|-
| [http://gcc.gnu.org/PR45261 45261] || Doesn't indicate failure status when it doesn't support (attiny2313A)
| 4.5.3
|-
| '''[http://gcc.gnu.org/PR42240 42240]''' || [4.3/4.4 Regression] wrong epilogue on naked function
| 4.5.3
|-
| '''[http://gcc.gnu.org/PR41885 41885]''' || Rotate patterns do not correctly consider overlap.
| 4.5.0
|}

== Weblinks ==

* [http://gcc.gnu.org/bugzilla/buglist.cgi?cf_known_to_fail_type=allwords&cf_gcctarget=avr&cf_known_to_work_type=allwords&query_format=advanced&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=WAITING&bug_status=REOPENED&cf_gcctarget_type=allwordssubstr&product=gcc gcc.gnu.org/bugzilla: avr]
* [http://savannah.nongnu.org/bugs/?group=avr-libc avr-libc: Fehler]

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