ARM softfloat support - Githubissues

aykevl commented 3 months ago
This adds softfloat support to GOARM, as proposed here: https://github.com/golang/go/issues/61588
This is similar to https://github.com/tinygo-org/tinygo/pull/4189 but with a few differences:
It is based on the work to support MIPS softfloat.
It fixes the issue that the default changed to softfloat everywhere. This PR defaults to softfloat on ARMv5 and hardfloat on ARMv6 and ARMv7.
It also compiles the C libraries (compiler-rt, musl) using the same soft/hard floating point support. This is important because otherwise a GOARM=7,softfloat binary could still contain hardware floating point instructions.
I checked that the generated instructions (both for Go code and for the musl library) are as expected (softfloat vs hardfloat).
~Draft because it needs to be rebased after #4371 is merged.~
CC @MDr164 I hope you don't mind me taking over the work, but this seems important to have (and #4189 would have needed some big refactoring anyway after #4371).
MDr164 commented 3 months ago
Yeah sorry I didn't get around testing more on ARM as I was totally swamped the past weeks. Feel free to copy any code from my PR if that helps.
aykevl commented 3 months ago
This PR is ready now, assuming CI passes.
github-actions[bot] commented 3 months ago
Size difference with the dev branch:
Binary size difference
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    tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
    go: downloading tinygo.org/x/tinyfont v0.3.0
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    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
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  88392   88392      0   0.00%    6076    6076      0   0.00% tinygo build -size short -o ./build/test.hex -target=challenger-rp2040 ./examples/net/ntpclient/
 291480  291480      0   0.00%   12508   12508      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal -stack-size 8kb ./examples/net/http-get/
 116788  116788      0   0.00%    7744    7744      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 -stack-size 8kb ./examples/net/tcpclient/
 240256  240256      0   0.00%    9264    9264      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
 100960  100960      0   0.00%    9728    9728      0   0.00% tinygo build -size short -o ./build/test.hex -target=metro-m4-airlift -stack-size 8kb ./examples/net/socket/
 332216  332216      0   0.00%   15504   15504      0   0.00% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/
 108484  108484      0   0.00%    7516    7516      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/
 152772  152772      0   0.00%    6428    6428      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
 113892  113892      0   0.00%   12868   12868      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/
 281308  281308      0   0.00%   17928   17928      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/
 282700  282700      0   0.00%   16988   16988      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
5193864 5193864      0   0.00%  780034  780034      0   0.00%
MDr164 commented 3 months ago
This PR is ready now, assuming CI passes.
Looks good! I assume the two boards failing in CI are not failing due to this PR. On one flashing failed and the other error also doesn't look related.
deadprogram commented 3 months ago
Thanks for the addition @aykevl and to @MDr164 for review. Now merging.
tinygo-org / tinygo

ARM softfloat support #4374
