embecosm / avr-gcc Goto Github PK

A fork of the GCC mainline for work on the AVR tool chain

License: GNU General Public License v2.0

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herecouldbename gcarneiroa youaremylife

avr-gcc's Issues

Edge case optimization produces incorrect machine code

volatile register gbf asm("18");
enum gbf_Flags {
	MONITOR,
	NEST,
	MINE,
	EOM,
	CMD,
	WHO
};

#define set_flag(flag) asm volatile("sbr %0, %1" :"+r"(gbf):"I"(flag))
#define clear_flag(flag) asm volatile("cbr %0, %1" :"+r"(gbf):"I"(flag))

void main() {
	set_flag(NEST);
	clear_flag(NEST);
}

Compiles to:

main:
	ori 18, 0x01 ; Incorrect behavior!!
	andi 18, 0xFE

Should be:

main:
	sbr 18, 1
	cbr 18, 1

Or:

main:
	ori 18, 0x02
	andi 18, 0xFD

avr-gcc --version: avr-gcc (GCC) 5.4.0
avr-objdump --version: GNU objdump (GNU Binutils) 2.26.20160125
uname -a: Linux Darkmatter 4.15.0-88-generic #88-Ubuntu SMP Tue Feb 11 20:11:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Architecture: ATtiny10 (avr1)
Compiled with: avr-gcc -ffreestanding -mmcu attiny10 main.c -o main.o
Read with: avr-objdump -m avr1 -D main.o

This workaround can be used instead with no change in code size:

#define set_flag(flag) asm volatile("ori %0, 1<<%1" :"+r"(gbf):"I"(flag))
#define clear_flag(flag) asm volatile("andi %0, ~(1<<%1)" :"+r"(gbf):"I"(flag))

Not sure why, but I can't seem to get the compiler to use the "M" constraint for _BV(flag) without it warning that it doesn't match the constraints, so bit shifting is done in the assembly.

undefined reference to `__gcov_exit'

Hello. Thanks a lot for porting GCC over to AVR 8-bit! Mostly everything's been fine for me, with the exception of avr-gcov/libgcov.a. When linking compiled object files into a final AVR 8-bit binary with sources using gcov flags, I get errors about undefined reference to '__gcov_exit'.

What's the exact state on gcov in this fork? I'd like to instrument coverage collection over gdb/serial. I haven't had much luck finding documentation about it with the recent version. After searching the repositoriy, I can find no reference of a defined __gcov_exit symbol, though it seems to have existed in the past.

Any help would be greatly appreciated, and I thank you very much for your time regardless!

Below are details about my environment.

operating system: Arch Linux, 64-bit
kernel version: 5.9.9
avr-gcc version: 10.2.0 (comes with avr-gcov).

Following is a log of my build process, which ends up with a failed link step due to a missing __gcov_exit.

mkdir -p bin
mkdir -p lib
avr-gcc -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/hooks.c -o arduino-avr-core/cores/arduino/hooks.c.o -lm -fprofile-arcs -ftest-coverage
avr-gcc -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/WInterrupts.c -o arduino-avr-core/cores/arduino/WInterrupts.c.o -lm -fprofile-arcs -ftest-coverage
avr-gcc -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/wiring_analog.c -o arduino-avr-core/cores/arduino/wiring_analog.c.o -lm -fprofile-arcs -ftest-coverage
avr-gcc -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/wiring.c -o arduino-avr-core/cores/arduino/wiring.c.o -lm -fprofile-arcs -ftest-coverage
avr-gcc -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/wiring_digital.c -o arduino-avr-core/cores/arduino/wiring_digital.c.o -lm -fprofile-arcs -ftest-coverage
avr-gcc -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/wiring_pulse.c -o arduino-avr-core/cores/arduino/wiring_pulse.c.o -lm -fprofile-arcs -ftest-coverage
avr-gcc -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/wiring_shift.c -o arduino-avr-core/cores/arduino/wiring_shift.c.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/abi.cpp -o arduino-avr-core/cores/arduino/abi.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/CDC.cpp -o arduino-avr-core/cores/arduino/CDC.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/HardwareSerial0.cpp -o arduino-avr-core/cores/arduino/HardwareSerial0.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/HardwareSerial1.cpp -o arduino-avr-core/cores/arduino/HardwareSerial1.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/HardwareSerial2.cpp -o arduino-avr-core/cores/arduino/HardwareSerial2.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/HardwareSerial3.cpp -o arduino-avr-core/cores/arduino/HardwareSerial3.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/HardwareSerial.cpp -o arduino-avr-core/cores/arduino/HardwareSerial.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/IPAddress.cpp -o arduino-avr-core/cores/arduino/IPAddress.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/main.cpp -o arduino-avr-core/cores/arduino/main.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/new.cpp -o arduino-avr-core/cores/arduino/new.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/PluggableUSB.cpp -o arduino-avr-core/cores/arduino/PluggableUSB.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/Print.cpp -o arduino-avr-core/cores/arduino/Print.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/Stream.cpp -o arduino-avr-core/cores/arduino/Stream.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/Tone.cpp -o arduino-avr-core/cores/arduino/Tone.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/USBCore.cpp -o arduino-avr-core/cores/arduino/USBCore.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/WMath.cpp -o arduino-avr-core/cores/arduino/WMath.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/cores/arduino/WString.cpp -o arduino-avr-core/cores/arduino/WString.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c arduino-avr-core/libraries/SoftwareSerial/src/SoftwareSerial.cpp -o arduino-avr-core/libraries/SoftwareSerial/src/SoftwareSerial.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/stubs/CoverageStubs.cpp -o src/stubs/CoverageStubs.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/tests/Main.test.cpp -o src/tests/Main.test.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/GPIO.cpp -o src/GPIO.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/LDR.cpp -o src/LDR.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/Main.cpp -o src/Main.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/Pin.cpp -o src/Pin.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/Stopwatch.cpp -o src/Stopwatch.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/Time.cpp -o src/Time.cpp.o -lm -fprofile-arcs -ftest-coverage
avr-gcc -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib -c src/Printf.c -o src/Printf.c.o -lm -fprofile-arcs -ftest-coverage
avr-gcc-ar rcs lib/libduino-main.a \
	arduino-avr-core/cores/arduino/main.cpp.o
avr-gcc-ar rcs lib/libduino.a \
	arduino-avr-core/cores/arduino/hooks.c.o arduino-avr-core/cores/arduino/WInterrupts.c.o arduino-avr-core/cores/arduino/wiring_analog.c.o arduino-avr-core/cores/arduino/wiring.c.o arduino-avr-core/cores/arduino/wiring_digital.c.o arduino-avr-core/cores/arduino/wiring_pulse.c.o arduino-avr-core/cores/arduino/wiring_shift.c.o arduino-avr-core/cores/arduino/abi.cpp.o arduino-avr-core/cores/arduino/CDC.cpp.o arduino-avr-core/cores/arduino/HardwareSerial0.cpp.o arduino-avr-core/cores/arduino/HardwareSerial1.cpp.o arduino-avr-core/cores/arduino/HardwareSerial2.cpp.o arduino-avr-core/cores/arduino/HardwareSerial3.cpp.o arduino-avr-core/cores/arduino/HardwareSerial.cpp.o arduino-avr-core/cores/arduino/IPAddress.cpp.o arduino-avr-core/cores/arduino/main.cpp.o arduino-avr-core/cores/arduino/new.cpp.o arduino-avr-core/cores/arduino/PluggableUSB.cpp.o arduino-avr-core/cores/arduino/Print.cpp.o arduino-avr-core/cores/arduino/Stream.cpp.o arduino-avr-core/cores/arduino/Tone.cpp.o arduino-avr-core/cores/arduino/USBCore.cpp.o arduino-avr-core/cores/arduino/WMath.cpp.o arduino-avr-core/cores/arduino/WString.cpp.o arduino-avr-core/libraries/SoftwareSerial/src/SoftwareSerial.cpp.o
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib \
	src/Printf.c.o src/GPIO.cpp.o src/LDR.cpp.o src/Main.cpp.o src/Pin.cpp.o src/Stopwatch.cpp.o src/Time.cpp.o  \
	src/tests/Main.test.cpp.o \
	-o bin/Main.test \
	-fprofile-arcs -ftest-coverage -lduino -lm
avr-g++ -std=gnu++11 -g -ggdb -O0 -w -fpermissive -Wno-error=narrowing  -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -DF_CPU=16000000L -mmcu=atmega2560 -I arduino-avr-core/cores/arduino -I arduino-avr-core/variants/standard -I arduino-avr-core/variants/eightanaloginputs -I arduino-avr-core/libraries/SoftwareSerial/src -L ./lib \
	src/GPIO.cpp.o src/LDR.cpp.o src/Main.cpp.o src/Pin.cpp.o src/Stopwatch.cpp.o src/Time.cpp.o src/Printf.c.o  \
	-o bin/avr-cs-sensor \
	-fprofile-arcs -ftest-coverage -lduino -lduino-main -lm
/usr/bin/avr-ld: src/GPIO.cpp.o: in function `_GLOBAL__sub_D__ZN11GPIOLibrary7pinModeEhh':
/home/kevr/dev/avr/src/GPIO.cpp:17: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/LDR.cpp.o: in function `_GLOBAL__sub_I__ZNK3LDR5resetEm':
/home/kevr/dev/avr/src/LDR.cpp:11: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/Main.cpp.o: in function `_GLOBAL__sub_I_setup':
/home/kevr/dev/avr/src/Main.cpp:82: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/Pin.cpp.o: in function `_GLOBAL__sub_D__ZN3PinC2Eh':
/home/kevr/dev/avr/src/Pin.cpp:58: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/Stopwatch.cpp.o: in function `_GLOBAL__sub_I__ZN9Stopwatch5startEv':
/home/kevr/dev/avr/src/Stopwatch.cpp:19: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/Time.cpp.o:/home/kevr/dev/avr/src/Time.cpp:23: more undefined references to `__gcov_exit' follow
collect2: error: ld returned 1 exit status
/usr/bin/avr-ld: src/Printf.c.o: in function `uartPutchar':
/home/kevr/dev/avr/src/Printf.c:16: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/GPIO.cpp.o: in function `_GLOBAL__sub_D__ZN11GPIOLibrary7pinModeEhh':
/home/kevr/dev/avr/src/GPIO.cpp:17: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/LDR.cpp.o: in function `_GLOBAL__sub_I__ZNK3LDR5resetEm':
/home/kevr/dev/avr/src/LDR.cpp:11: undefined reference to `__gcov_exit'
make: *** [Makefile:78: avr-cs-sensor] Error 1
make: *** Waiting for unfinished jobs....
/usr/bin/avr-ld: src/Main.cpp.o: in function `_GLOBAL__sub_I_setup':
/home/kevr/dev/avr/src/Main.cpp:82: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/Pin.cpp.o: in function `_GLOBAL__sub_D__ZN3PinC2Eh':
/home/kevr/dev/avr/src/Pin.cpp:58: undefined reference to `__gcov_exit'
/usr/bin/avr-ld: src/Stopwatch.cpp.o:/home/kevr/dev/avr/src/Stopwatch.cpp:19: more undefined references to `__gcov_exit' follow
collect2: error: ld returned 1 exit status
make: *** [Makefile:87: Main.test] Error 1

If there are any other details that may be important, please let me know.

Valid register is over written by postreload pass

AVR target built with specs:

Using built-in specs.
COLLECT_GCC=/home/vishnu.k_s/build-linux_x86_64/bldcc/gcc/xgcc
Target: avr
Configured with: ../gcc-trunk/configure --prefix=/home/vishnu.k_s/build-linux_x86_64//install --target=avr --enable-languages=c,c++ --disable-nls --with-gmp=/proj/install/gmp-4.3.2/ --with-mpfr=/proj/install/mpfr-2.4.2/ --with-mpc=/proj/install/mpc-0.8.2/
Thread model: single
gcc version 4.9.0 20130326 (experimental) (GCC)

Above compiler generate wrong code for testcase present in gcc.c-torture/execute/simd-1.c.
gcc options : -O1 -mmcu=atmega1280

(snip of assembly)

ldi r30,lo8(res) ; r30/r31 is loaded with address of res
ldi r31,hi8(res) ;
st Z,r24

ldd r31,Y+1 ; Modifying r31 register

sts res+1,r31
sts res+2,r27
sts res+3,r26
sts res+4,r23
...
lds r22,res+4+2
lds r23,res+4+3

ld r24,Z ; regsiter pair r30/r31 is used to load from res
ldd r25,Z+1
ldd r26,Z+2
ldd r27,Z+3

(snip of assembly)

It looks like r31 is corrupted after reload pass.

gcc bugzilla entry: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56833

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