Issues

• i386 fastcall: a union of a float and a structure of a complex spend the wrong number of registers

  area/abikind/bugpriority/p2
  tamnd/rucc#3029 · Filter by author tamnd opened on Oct 6, 2026

• i686: a value read back after a call whose callee pops is read from the wrong slot

  area/abikind/bugpriority/p1
  tamnd/rucc#3027 · Filter by author tamnd opened on Oct 6, 2026

• rangetest never fires at -O1 and -Os, since nothing there makes the form it reads

  area/optimizerkind/perfpriority/p2
  tamnd/rucc#3017 · Filter by author tamnd opened on Oct 6, 2026 · M4.7: Measurement and tuning

• A goto out of a nested function and a variadic nested function

  area/gnu-compatkind/feature
  tamnd/rucc#2980 · Filter by author tamnd opened on Oct 5, 2026

• Spec 19 Q5: measure what the no poison model costs

  area/irarea/perfkind/perfpriority/p2
  tamnd/rucc#2974 · Filter by author tamnd opened on Oct 5, 2026 · M4.7: Measurement and tuning

• First code quality measurement against gcc -O2 on the LLVM test suite

  area/perfarea/testingkind/perfpriority/p1
  tamnd/rucc#2973 · Filter by author tamnd opened on Oct 5, 2026 · M4.7: Measurement and tuning

• Compile time per phase against the budget of section 42.7

  area/perfkind/perfpriority/p1
  tamnd/rucc#2972 · Filter by author tamnd opened on Oct 5, 2026 · M4.7: Measurement and tuning

• Experiment 61: measure the block copy and clear thresholds

  area/backendarea/perfkind/perfpriority/p2
  tamnd/rucc#2971 · Filter by author tamnd opened on Oct 5, 2026 · M4.7: Measurement and tuning

• Experiment 60: every constant of section 40.12 at half and at double

  area/optimizerarea/perfkind/perfpriority/p1
  tamnd/rucc#2970 · Filter by author tamnd opened on Oct 5, 2026 · M4.7: Measurement and tuning

• --param for the constants of section 40.12

  area/driverarea/optimizerkind/featurepriority/p1
  tamnd/rucc#2969 · Filter by author tamnd opened on Oct 5, 2026 · M4.7: Measurement and tuning

• Measure every -O2 pass with that pass off, over the corpus

  area/optimizerarea/testingkind/perfpriority/p0
  tamnd/rucc#2968 · Filter by author tamnd opened on Oct 5, 2026 · M4.7: Measurement and tuning

• icmp ne (sub nsw x, 1), -1 is not folded to icmp ne x, 0

  area/optimizerarea/ruleskind/bug
  tamnd/rucc#2949 · Filter by author tamnd opened on Oct 5, 2026

• An always_inline gnu_inline variadic function is not inlined on aarch64 and wasm32

  area/optimizerkind/bug
  tamnd/rucc#2948 · Filter by author tamnd opened on Oct 5, 2026

• x > __builtin_inf() is not folded at -O0

  area/optimizerkind/bug
  tamnd/rucc#2947 · Filter by author tamnd opened on Oct 5, 2026

• Four torture programs that cannot run on wasm32-wasip1

  area/wasmkind/test
  tamnd/rucc#2946 · Filter by author tamnd opened on Oct 5, 2026 · WA3: the hard C on wasm

• Pass two of the inliner: the badness heap, its hints and the unit growth bound

  area/optimizerkind/featurepriority/p1
  tamnd/rucc#2897 · Filter by author tamnd opened on Oct 5, 2026 · M4.5: Interprocedural

• WA7: wasm breadth

  area/asmarea/backendarea/crossarea/debugarea/gnu-compatarea/wasmkind/milestonepriority/p2status/gate
  tamnd/rucc#2869 · Filter by author tamnd opened on Oct 5, 2026 · WA7: wasm breadth

• WA6: wasm components and wasip3

  area/abiarea/crossarea/objectsarea/sysrootarea/wasmkind/milestonepriority/p2status/gate
  tamnd/rucc#2868 · Filter by author tamnd opened on Oct 5, 2026 · WA6: wasm components and wasip3

• WA5: in-process wasm linker and rucc in the browser

  area/driverarea/objectsarea/sysrootarea/wasmkind/milestonepriority/p2status/gate
  tamnd/rucc#2867 · Filter by author tamnd opened on Oct 5, 2026 · WA5: in-process wasm linker and rucc in the browser

• WA4: wasm -O2 quality and size

  area/backendarea/optimizerarea/perfarea/wasmkind/milestonekind/perfpriority/p1status/gate
  tamnd/rucc#2866 · Filter by author tamnd opened on Oct 5, 2026 · WA4: wasm -O2 quality and size
  17

• Eleven x86-64 lowering rules have nothing that writes their pattern

  area/x86-64kind/chore
  tamnd/rucc#2772 · Filter by author tamnd opened on Oct 3, 2026

• zero_call_used_regs clears nothing when a function ends in a libgcc tail call on AArch64

  area/backendkind/bug
  tamnd/rucc#2563 · Filter by author tamnd opened on Oct 1, 2026

• Honour stdcall, fastcall, thiscall and regparm on i686

  area/abikind/bug
  tamnd/rucc#2534 · Filter by author tamnd opened on Oct 1, 2026
  1

• Allow _BitInt wider than 128 bits

  area/frontendkind/feature
  tamnd/rucc#2490 · Filter by author tamnd opened on Sep 30, 2026

• Take __builtin_va_arg_pack in a static inline always_inline function

  area/gnu-compatkind/feature
  tamnd/rucc#2485 · Filter by author tamnd opened on Sep 30, 2026