Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC

Commits:

• 023c301c
  by sheaf at 2026-01-13T04:57:30-05:00

  Don't re-use stack slots for growing registers
  
  This commit avoids re-using a stack slot for a register that has grown
  but already had a stack slot.
  
  For example, suppose we have stack slot assigments
  
    %v1 :: FF64 |-> StackSlot 0
    %v2 :: FF64 |-> StackSlot 1
  
  Later, we start using %v1 at a larger format (e.g. F64x2) and we need
  to spill it again. Then we **must not** use StackSlot 0, as a spill
  at format F64x2 would clobber the data in StackSlot 1.
  
  This can cause some fragmentation of the `StackMap`, but that's probably
  OK.
  
  Fixes #26668
  

• d0966e64
  by fendor at 2026-01-13T04:58:11-05:00

  Remove `traceId` from ghc-pkg executable
  

• 64fcc203
  by Simon Peyton Jones at 2026-01-13T05:30:55-05:00

  Make SpecContr rules fire a bit later
  
  See #26615 and Note [SpecConstr rule activation]
  

• 964ec5e2
  by Andrew Lelechenko at 2026-01-13T05:30:56-05:00

  Upgrade mtl submodule to 2.3.2
  
  Fixes #26656
  

• d00f9a3b
  by Cheng Shao at 2026-01-13T05:30:57-05:00

  compiler: remove iserv and only use on-demand external interpreter
  
  This patch removes `iserv` from the tree completely. Hadrian would no
  longer build or distribute `iserv`, and the GHC driver would use the
  on-demand external interpreter by default when invoked with
  `-fexternal-interpreter`, without needing to specify `-pgmi ""`. This
  has multiple benefits:
  
  - It allows cleanup of a lot of legacy hacks in the hadrian codebase.
  - It paves the way for running cross ghc's iserv via cross emulator
    (#25523), fixing TH/ghci support for cross targets other than
    wasm/js.
  

42 changed files:

• CODEOWNERS
• cabal.project-reinstall
• compiler/GHC/CmmToAsm/Reg/Linear.hs
• compiler/GHC/CmmToAsm/Reg/Linear/StackMap.hs
• compiler/GHC/Core/Opt/Simplify/Env.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Opt/WorkWrap.hs
• compiler/GHC/Core/Rules.hs
• compiler/GHC/Core/Unfold/Make.hs
• compiler/GHC/Runtime/Interpreter/Init.hs
• compiler/GHC/Settings/IO.hs
• docs/users_guide/ghci.rst
• docs/users_guide/phases.rst
• hadrian/doc/user-settings.md
• hadrian/src/Packages.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/CabalReinstall.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Program.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Settings/Builders/Ghc.hs
• hadrian/src/Settings/Default.hs
• hadrian/src/Settings/Packages.hs
• libraries/mtl
• − testsuite/tests/driver/T24731.hs
• testsuite/tests/driver/all.T
• testsuite/tests/simplCore/should_compile/T14003.stderr
• testsuite/tests/simplCore/should_compile/T19672.stderr
• testsuite/tests/simplCore/should_compile/T21763.stderr
• testsuite/tests/simplCore/should_compile/T21763a.stderr
• + testsuite/tests/simplCore/should_compile/T26615.hs
• + testsuite/tests/simplCore/should_compile/T26615.stderr
• + testsuite/tests/simplCore/should_compile/T26615a.hs
• testsuite/tests/simplCore/should_compile/T4908.stderr
• testsuite/tests/simplCore/should_compile/all.T
• testsuite/tests/simplCore/should_compile/spec-inline.stderr
• utils/ghc-pkg/Main.hs
• − utils/iserv/iserv.cabal.in
• − utils/iserv/src/Main.hs

The diff was not included because it is too large.