gnu assembler can't deal with AL condition code in itblock
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| GNU Arm Embedded Toolchain |
In Progress
|
Low
|
Przemyslaw Wirkus | ||
Bug Description
toolchain version: 2016q3 5.4
assembler version: GNU assembler version 2.26.0 (arm-none-eabi) using BFD version (GNU Tools for ARM Embedded Processors) 2.26.0.20160616
assembler options: -march=armv7e-m -mthumb -mfloat-abi=hard -mfpu=neon -meabi=5 -k -v
example code:
.syntax unified
.code 16
ITTTT al
ORRAL R2, R5
LSRAL R0, R4
ORRAL R0, R7
LSRAL R1, R4
tested with apple clang shipping with xcode 5.1.1
clang -arch armv7 -c -o itblockclang.o itblock.s
same code can build in IAR EWARM 7.30:
SECTION `.text`
THUMB
ITTTT al // .byte 0xE1, 0xBF
ORRAL R2, R5 // .byte 0x2A, 0x43
LSRAL R0, R4 // .byte 0xE0, 0x40
ORRAL R0, R7 // .byte 0x38, 0x43
LSRAL R1, R4 // .byte 0xE1, 0x40
END
but gnu as failed to compile and output such error:
itblock.s: Assembler messages:
itblock.s:5: Error: instruction not allowed in IT block -- `orral R2,R5'
itblock.s:6: Error: instruction not allowed in IT block -- `lsral R0,R4'
itblock.s:7: Error: instruction not allowed in IT block -- `orral R0,R7'
itblock.s:8: Error: instruction not allowed in IT block -- `lsral R1,R4'
| Andre Vieira (andre-simoesdiasvieira) wrote | #1 |
| Changed in gcc-arm-embedded: | |
| status: | New → Confirmed |
| importance: | Undecided → Low |
| Changed in gcc-arm-embedded: | |
| status: | Confirmed → In Progress |
| Dan Lewis (danielwlewis) wrote | #2 |
| Changed in gcc-arm-embedded: | |
| assignee: | nobody → Przemyslaw Wirkus (wirkus) |
Hello Banxian,
We are aware of this limitation. Unfortunately, we have not yet got around to fixing it. For the time being we suggest you use the .insn directive, so for your code:
.inst 0xbfe1
.inst 0x432a
.inst 0x40e0
.inst 0x4338
.inst 0x40e1
Kind Regards,
Andre