From 63e5d14b8a87c2cd69d7cf71b3001e7cf3b04ae1 Mon Sep 17 00:00:00 2001
From: John Naylor <john.naylor@postgresql.org>
Date: Wed, 11 Feb 2026 14:34:18 +0700
Subject: [PATCH v2 1/4] Rename CRC "choose" files for future general purpose

WIP: x86 only
---
 configure                                           | 4 ++--
 configure.ac                                        | 4 ++--
 src/port/Makefile                                   | 1 +
 src/port/meson.build                                | 3 +--
 src/port/{pg_crc32c_sse42_choose.c => pg_cpu_x86.c} | 8 ++++++--
 5 files changed, 12 insertions(+), 8 deletions(-)
 rename src/port/{pg_crc32c_sse42_choose.c => pg_cpu_x86.c} (94%)

diff --git a/configure b/configure
index a10a2c85c6a..185703289b4 100755
--- a/configure
+++ b/configure
@@ -18196,7 +18196,7 @@ if test x"$USE_SSE42_CRC32C" = x"1"; then
 
 $as_echo "#define USE_SSE42_CRC32C 1" >>confdefs.h
 
-  PG_CRC32C_OBJS="pg_crc32c_sse42.o pg_crc32c_sse42_choose.o"
+  PG_CRC32C_OBJS="pg_crc32c_sse42.o"
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: SSE 4.2" >&5
 $as_echo "SSE 4.2" >&6; }
 else
@@ -18204,7 +18204,7 @@ else
 
 $as_echo "#define USE_SSE42_CRC32C_WITH_RUNTIME_CHECK 1" >>confdefs.h
 
-    PG_CRC32C_OBJS="pg_crc32c_sse42.o pg_crc32c_sb8.o pg_crc32c_sse42_choose.o"
+    PG_CRC32C_OBJS="pg_crc32c_sse42.o pg_crc32c_sb8.o"
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: SSE 4.2 with runtime check" >&5
 $as_echo "SSE 4.2 with runtime check" >&6; }
   else
diff --git a/configure.ac b/configure.ac
index 814e64a967e..0955b7e4371 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2245,12 +2245,12 @@ fi
 AC_MSG_CHECKING([which CRC-32C implementation to use])
 if test x"$USE_SSE42_CRC32C" = x"1"; then
   AC_DEFINE(USE_SSE42_CRC32C, 1, [Define to 1 use Intel SSE 4.2 CRC instructions.])
-  PG_CRC32C_OBJS="pg_crc32c_sse42.o pg_crc32c_sse42_choose.o"
+  PG_CRC32C_OBJS="pg_crc32c_sse42.o"
   AC_MSG_RESULT(SSE 4.2)
 else
   if test x"$USE_SSE42_CRC32C_WITH_RUNTIME_CHECK" = x"1"; then
     AC_DEFINE(USE_SSE42_CRC32C_WITH_RUNTIME_CHECK, 1, [Define to 1 to use Intel SSE 4.2 CRC instructions with a runtime check.])
-    PG_CRC32C_OBJS="pg_crc32c_sse42.o pg_crc32c_sb8.o pg_crc32c_sse42_choose.o"
+    PG_CRC32C_OBJS="pg_crc32c_sse42.o pg_crc32c_sb8.o"
     AC_MSG_RESULT(SSE 4.2 with runtime check)
   else
     if test x"$USE_ARMV8_CRC32C" = x"1"; then
diff --git a/src/port/Makefile b/src/port/Makefile
index 6e3b7d154ed..47cfea1507d 100644
--- a/src/port/Makefile
+++ b/src/port/Makefile
@@ -44,6 +44,7 @@ OBJS = \
 	noblock.o \
 	path.o \
 	pg_bitutils.o \
+	pg_cpu_x86.o \
 	pg_localeconv_r.o \
 	pg_numa.o \
 	pg_popcount_aarch64.o \
diff --git a/src/port/meson.build b/src/port/meson.build
index d7d4e705b89..edb2e5632bd 100644
--- a/src/port/meson.build
+++ b/src/port/meson.build
@@ -7,6 +7,7 @@ pgport_sources = [
   'noblock.c',
   'path.c',
   'pg_bitutils.c',
+  'pg_cpu_x86.c',
   'pg_localeconv_r.c',
   'pg_numa.c',
   'pg_popcount_aarch64.c',
@@ -86,8 +87,6 @@ replace_funcs_pos = [
   # x86/x64
   ['pg_crc32c_sse42', 'USE_SSE42_CRC32C'],
   ['pg_crc32c_sse42', 'USE_SSE42_CRC32C_WITH_RUNTIME_CHECK'],
-  ['pg_crc32c_sse42_choose', 'USE_SSE42_CRC32C'],
-  ['pg_crc32c_sse42_choose', 'USE_SSE42_CRC32C_WITH_RUNTIME_CHECK'],
   ['pg_crc32c_sb8', 'USE_SSE42_CRC32C_WITH_RUNTIME_CHECK'],
 
   # arm / aarch64
diff --git a/src/port/pg_crc32c_sse42_choose.c b/src/port/pg_cpu_x86.c
similarity index 94%
rename from src/port/pg_crc32c_sse42_choose.c
rename to src/port/pg_cpu_x86.c
index f586476964f..998a70ffa41 100644
--- a/src/port/pg_crc32c_sse42_choose.c
+++ b/src/port/pg_cpu_x86.c
@@ -1,6 +1,6 @@
 /*-------------------------------------------------------------------------
  *
- * pg_crc32c_sse42_choose.c
+ * pg_cpu_x86.c
  *	  Choose between Intel SSE 4.2 and software CRC-32C implementation.
  *
  * On first call, checks if the CPU we're running on supports Intel SSE
@@ -13,13 +13,15 @@
  *
  *
  * IDENTIFICATION
- *	  src/port/pg_crc32c_sse42_choose.c
+ *	  src/port/pg_cpu_x86.c
  *
  *-------------------------------------------------------------------------
  */
 
 #include "c.h"
 
+#if defined(USE_SSE2) || defined(__i386__)
+
 #if defined(HAVE__GET_CPUID) || defined(HAVE__GET_CPUID_COUNT)
 #include <cpuid.h>
 #endif
@@ -107,3 +109,5 @@ pg_comp_crc32c_choose(pg_crc32c crc, const void *data, size_t len)
 }
 
 pg_crc32c	(*pg_comp_crc32c) (pg_crc32c crc, const void *data, size_t len) = pg_comp_crc32c_choose;
+
+#endif							/* defined(USE_SSE2) || defined(__i386__) */
-- 
2.53.0