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md5/md4: enable unaligned access fast path on powerpc64

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PowerPC64 (both big-endian and little-endian) supports efficient
unaligned memory access, similar to x86. This extends the existing
fast path that avoids byte-by-byte loads in the MD5 and MD4 SET/GET
macros.

On POWER8 ppc64le, this eliminates 3 shifts + 3 ORs per 32-bit word
load, replacing them with a single lwz (or lwbrx on big-endian).

Co Authored By Claude Opus 4.6 (1M context)

Closes #20985
This commit is contained in:
Scott Boudreaux 2026-03-18 10:56:09 -05:00 committed by Daniel Stenberg
parent 77ed315096
commit 21fc17b265
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GPG Key ID: 5CC908FDB71E12C2
2 changed files with 4 additions and 2 deletions
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3
lib/md4.c
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@ -213,7 +213,8 @@ typedef struct md4_ctx MD4_CTX;
* The check for little-endian architectures that tolerate unaligned memory
* accesses is an optimization. Nothing will break if it does not work.
*/
#if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
#if defined(__i386__) || defined(__x86_64__) || \
defined(__vax__) || defined(__powerpc64__)
#define MD4_SET(n) (*(const uint32_t *)(const void *)&ptr[(n) * 4])
#define MD4_GET(n) MD4_SET(n)
#else

3
lib/md5.c
View File

@ -294,7 +294,8 @@ typedef struct md5_ctx my_md5_ctx;
* The check for little-endian architectures that tolerate unaligned memory
* accesses is an optimization. Nothing will break if it does not work.
*/
#if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
#if defined(__i386__) || defined(__x86_64__) || \
defined(__vax__) || defined(__powerpc64__)
#define MD5_SET(n) (*(const uint32_t *)(const void *)&ptr[(n) * 4])
#define MD5_GET(n) MD5_SET(n)
#else