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pg_attribute_no_sanitize_alignment() macro

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Modern gcc and clang compilers offer alignment sanitizers, which help to detect
pointer misalignment.  However, our codebase already contains x86-specific
crc32 computation code, which uses unalignment access.  Thankfully, those
compilers also support the attribute, which disables alignment sanitizers at
the function level.  This commit adds pg_attribute_no_sanitize_alignment(),
which wraps this attribute, and applies it to pg_comp_crc32c_sse42() function.

Discussion: https://postgr.es/m/CAPpHfdsne3%3DT%3DfMNU45PtxdhSL_J2PjLTeS8rwKnJzUR4YNd4w%40mail.gmail.com
Discussion: https://postgr.es/m/475514.1612745257%40sss.pgh.pa.us
Author: Alexander Korotkov, revised by Tom Lane
Reviewed-by: Tom Lane
This commit is contained in:
Alexander Korotkov
2021-02-12 17:14:33 +03:00
parent c8b21b0378
commit 993bdb9f93
2 changed files with 13 additions and 0 deletions
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src/port/pg_crc32c_sse42.c
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@@ -18,6 +18,7 @@
#include "port/pg_crc32c.h"
pg_attribute_no_sanitize_alignment()
pg_crc32c
pg_comp_crc32c_sse42(pg_crc32c crc, const void *data, size_t len)
{