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The Wire · Showcase

GO STRIPS MIPS REGISTER ALLOCATOR SUPPORT

By RepoJournal · Filed · About Go

Jorropo
1 person shipped this
Jorropo @Jorropo 2 cited

Go's compiler is ripping out HI/LO register support for MIPS, closing the door on a decade of architectural complexity that wasn't worth the maintenance tax.

Jorropo landed a pair of commits that simplify the register allocator by removing special-case handling for MIPS multiply/divide results [1]. The alternative would have required building a register allocator for the register allocator itself, a complexity spiral the team decided wasn't worth the ROI [1]. The second commit [2] stops the compiler from keeping mul/div results homed in HI/LO registers, which previously forced spill operations through REGTMP and generated expensive address materializations when stack frames exceeded 16-bit offsets. This is a clean signal: MIPS support is moving toward maintenance mode. If you're running Go on MIPS, watch the release notes closely for what this means for your deployment.

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Action items

References

  1. [1] cmd/compile: remove HI LO mips support from regalloc golang/go
  2. [2] cmd/compile: do not home mul/div results in HI/LO golang/go

Quick answers

What shipped in Go on July 26, 2026?
Go's compiler is ripping out HI/LO register support for MIPS, closing the door on a decade of architectural complexity that wasn't worth the maintenance tax. In total, 2 commits landed.
Who contributed to Go on July 26, 2026?
1 developer shipped this update, including Jorropo.
What were the notable Go updates?
cmd/compile: remove HI LO mips support from regalloc and cmd/compile: do not home mul/div results in HI/LO.

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