mips: use MIPS32 (instead of MIPS32R2) as the instruction set #4429
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This should widen compatibility a bit, so that older CPUs can also execute programs built by TinyGo. The performance may be lower, if that's an issue we can look into implementing the proposal here: golang/go#60072 This still wouldn't make programs usable on MIPS II CPUs, I suppose we can lower compatiblity down to that CPU if needed. I tried setting the -cpu flag in the QEMU command line to be able to test this, but it looks like there are no QEMU CPU models that are mips32r1 and have a FPU. So it's difficult to test this.
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Size difference with the dev branch: Binary size differencenot the same command!
tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
go: downloading tinygo.org/x/tinyfont v0.3.0
not the same command!
tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
go: downloading golang.org/x/net v0.7.0
not the same command!
tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
go: downloading github.com/soypat/natiu-mqtt v0.5.1
not the same command!
tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
go: downloading github.com/eclipse/paho.mqtt.golang v1.2.0
flash ram
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Now merging, thanks @aykevl |
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This should widen compatibility a bit, so that older CPUs can also execute programs built by TinyGo. The performance may be lower, if that's an issue we can look into implementing the proposal here: golang/go#60072
This still wouldn't make programs usable on MIPS II CPUs, I suppose we can lower compatiblity down to that CPU if needed.
I tried setting the -cpu flag in the QEMU command line to be able to test this, but it looks like there are no QEMU CPU models that are mips32r1 and have a FPU. So it's difficult to test this.