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| author | Noah Misch <noah@leadboat.com> | 2019-10-18 20:20:28 -0700 |
|---|---|---|
| committer | Noah Misch <noah@leadboat.com> | 2019-10-18 20:20:32 -0700 |
| commit | 09d74aef33decd311128e65fee2b1abd94f2bc6a (patch) | |
| tree | f1f07f31b91f491b750ccc0ff73896ebefb55298 /src/tutorial | |
| parent | 579996bc2fc72b5496ccabe573bce8f2355c92df (diff) | |
For PowerPC instruction "addi", use constraint "b".
Without "b", a variant of the tas() code miscompiles on macOS 10.4.
This may also fix a compilation failure involving macOS 10.1. Today's
compilers have been allocating acceptable registers with or without this
change, but this future-proofs the code by precisely conveying the
acceptable registers. Back-patch to 9.4 (all supported versions).
Reviewed by Tom Lane.
Discussion: https://postgr.es/m/20191009063900.GA4066266@rfd.leadboat.com
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