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mips: use MIPS32 (instead of MIPS32R2) as the instruction set

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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:
https://github.com/golang/go/issues/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.
This commit is contained in:
Ayke van Laethem
2024-08-22 15:53:22 +02:00
committed by Ron Evans
parent e39358d0ee
commit 25abfff632
1 changed files with 3 additions and 3 deletions
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compileopts/target.go
+3 -3
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@@ -336,7 +336,7 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
spec.Features = "+fp-armv8,+neon,-fmv,-outline-atomics" spec.Features = "+fp-armv8,+neon,-fmv,-outline-atomics"
} }
case "mips", "mipsle": case "mips", "mipsle":
spec.CPU = "mips32r2" spec.CPU = "mips32"
spec.CFlags = append(spec.CFlags, "-fno-pic") spec.CFlags = append(spec.CFlags, "-fno-pic")
if options.GOARCH == "mips" { if options.GOARCH == "mips" {
llvmarch = "mips" // big endian llvmarch = "mips" // big endian
@@ -345,10 +345,10 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
} }
switch options.GOMIPS { switch options.GOMIPS {
case "hardfloat": case "hardfloat":
spec.Features = "+fpxx,+mips32r2,+nooddspreg,-noabicalls" spec.Features = "+fpxx,+mips32,+nooddspreg,-noabicalls"
case "softfloat": case "softfloat":
spec.SoftFloat = true spec.SoftFloat = true
spec.Features = "+mips32r2,+soft-float,-noabicalls" spec.Features = "+mips32,+soft-float,-noabicalls"
spec.CFlags = append(spec.CFlags, "-msoft-float") spec.CFlags = append(spec.CFlags, "-msoft-float")
default: default:
return nil, fmt.Errorf("invalid GOMIPS=%s: must be hardfloat or softfloat", options.GOMIPS) return nil, fmt.Errorf("invalid GOMIPS=%s: must be hardfloat or softfloat", options.GOMIPS)