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math.huge prints 1.7976931348623e+308 when the host has real inf (lr_numstr/lr_fmt_g are finite-only)

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
lua
Domain
compilers

Research direction

Start in src/runtime.eigs at lr_numstr and lr_fmt_g, which format finite values only, and at the math.huge workaround near line 3286. Reproduce with print(math.huge, tostring(-math.huge)) under bin/eigenlua. The fix needs an IEEE EigenScript build (make ieee), which depends on upstream work (#1644 Phase 2), so confirm that build exists first. Done means non-finite values print inf, -inf and nan like Lua 5.4, with a test row covering math.huge, -math.huge and 0/0.

Written by the indexing model from the issue text.

Description

Found by EigenScript #1746 Phase 1 (IEEE-754 experiment build, make ieee). With real inf in the host, math.huge IS inf (math.huge > 1.7976931348623157e308 is true), but printing goes through lr_numstr -> lr_fmt_g (src/runtime.eigs, "C's %.

g for finite x"), which decodes exponent bits and prints 1.7976931348623e+308. Lua 5.4 prints inf, -inf, and nan/-nan.

Repro: print(math.huge, tostring(-math.huge)) with EIGENSCRIPT=<EigenScript build/ieee/eigenscript> bin/eigenlua -> 1.7976931348623e+308 -1.7976931348623e+308.

Only reachable once EigenScript ships IEEE doubles (#1644 Phase 2); today the host clamps to 1e308. The runtime.eigs:3286 math.huge workaround comment also goes stale then.

Done when

  • lr_numstr (and string.format %g/%f paths) emit inf/-inf/nan for non-finite values, matching Lua 5.4, under an IEEE host build.
  • A test row prints math.huge, -math.huge, 0/0 and compares to real Lua's output.
Dominant language
Lua
Stars
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Forks
0
Avg merge
54m
Merged PRs (30d)
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