cmd/compile: improve bit test code

Some bit test instruction generation stopped triggering after
the change to addressing modes. I suspect this was just because
ANDQload was being generated before the rewrite rules could discover
the BTQ. Fix that by decomposing the ANDQload when it is surrounded
by a TESTQ (thus re-enabling the BTQ rules).

Fixes #44228

Change-Id: I489b4a5a7eb01c65fc8db0753f8cec54097cadb2
Trust: Keith Randall <>
Trust: Josh Bleecher Snyder <>
Run-TryBot: Keith Randall <>
Reviewed-by: Josh Bleecher Snyder <>
3 files changed
tree: b9e1f10f66999a3e4ab9289dd07f7c7da295c2d8
  1. .gitattributes
  2. .github/
  3. .gitignore
  11. api/
  12. codereview.cfg
  13. doc/
  14. favicon.ico
  15. lib/
  16. misc/
  17. robots.txt
  18. src/
  19. test/

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