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Merge pull request #9783 from SparkiDev/aes_clang_volatile

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AES clang: make x volatile in pre-fetch functions
This commit is contained in:
David Garske
2026-02-17 10:10:56 -08:00
committed by GitHub
parent 90d0ea1ee2 299e7bd097
commit a0a76254a5
1 changed files with 14 additions and 8 deletions
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wolfcrypt/src/aes.c
+14 -8
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@@ -1880,15 +1880,17 @@ static WARN_UNUSED_RESULT word32 inv_col_mul(
static WARN_UNUSED_RESULT WC_INLINE word32 PreFetchTe(void)
{
#ifndef WOLFSSL_AES_TOUCH_LINES
word32 x = 0;
int i,j;
volatile word32 x = 0;
int i;
int j;
for (i = 0; i < 4; i++) {
/* 256 elements, each one is 4 bytes */
for (j = 0; j < 256; j += WC_CACHE_LINE_SZ/4) {
for (j = 0; j < 256; j += WC_CACHE_LINE_SZ / 4) {
x &= Te[i][j];
}
}
return x;
#else
return 0;
@@ -1899,12 +1901,13 @@ static WARN_UNUSED_RESULT WC_INLINE word32 PreFetchTe(void)
static WARN_UNUSED_RESULT WC_INLINE word32 PreFetchSBox(void)
{
#ifndef WOLFSSL_AES_TOUCH_LINES
word32 x = 0;
volatile word32 x = 0;
int i;
for (i = 0; i < 256; i += WC_CACHE_LINE_SZ/4) {
x &= Tsbox[i];
}
return x;
#else
return 0;
@@ -3168,15 +3171,17 @@ static WARN_UNUSED_RESULT int wc_AesEncrypt(
/* load 4 Td Tables into cache by cache line stride */
static WARN_UNUSED_RESULT WC_INLINE word32 PreFetchTd(void)
{
word32 x = 0;
int i,j;
volatile word32 x = 0;
int i;
int j;
for (i = 0; i < 4; i++) {
/* 256 elements, each one is 4 bytes */
for (j = 0; j < 256; j += WC_CACHE_LINE_SZ/4) {
for (j = 0; j < 256; j += WC_CACHE_LINE_SZ / 4) {
x &= Td[i][j];
}
}
return x;
}
#endif /* !WOLFSSL_AES_SMALL_TABLES */
@@ -3185,12 +3190,13 @@ static WARN_UNUSED_RESULT WC_INLINE word32 PreFetchTd(void)
static WARN_UNUSED_RESULT WC_INLINE word32 PreFetchTd4(void)
{
#ifndef WOLFSSL_AES_TOUCH_LINES
word32 x = 0;
volatile word32 x = 0;
int i;
for (i = 0; i < 256; i += WC_CACHE_LINE_SZ) {
x &= (word32)Td4[i];
}
return x;
#else
return 0;