Claude 7fd423dfe9 fix(shader): never branch conditionally to one label twice ...

SPIR-V 1.6 requires the true and false labels of OpBranchConditional to
differ. Two places produced the same label for both:

- The structured terminator emitter, for a conditional branch whose
  targets are the same block, such as s_cbranch_scc0 to the next
  instruction. It now emits OpBranch, keeping OpLoopMerge on a loop
  header.
- Pipeline specialization, when it folded a branch on a constant and
  kept the selection merge because the taken path is not linear. It
  wrote the taken label twice; the untaken side now names the
  selection's merge block, which the constant condition never takes.

Found by recompiling mutated compute shaders with SPIR-V validation on;
before this, 169 of 20000 were rejected for this rule, and builds
without SPIRV-Tools handed the module to the driver.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01VZWLdTjf1S57iLgn2rcaFb

2026-10-12 16:04:13 +00:00

..

Decoder

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libs

fix(shader): never branch conditionally to one label twice

2026-10-12 16:04:13 +00:00

relinker

Merge pull request #4060 from coltken95/claude/sleepy-dirac-e44kw4

2026-10-13 02:35:21 +13:00

shader/recompiler

fix(shader): never branch conditionally to one label twice

2026-10-12 16:04:13 +00:00