X-Git-Url: https://bearssl.org/gitweb//home/git/?p=BearSSL;a=blobdiff_plain;f=src%2Fconfig.h;h=d2e7a7deeaf64519ca3ee7745113900d8727734e;hp=5de3a5acf16611a602de0db7918afd1e795e7f38;hb=db8f1b664524e3fbeea8a0730b2bbe2f0bdcea86;hpb=21743ae69e609ec7ec157eaf0b54cfe4866b7ef2

diff --git a/src/config.h b/src/config.h
index 5de3a5a..d2e7a7d 100644
--- a/src/config.h
+++ b/src/config.h
@@ -41,6 +41,16 @@
 #define BR_64   1
  */
 
+/*
+ * When BR_LOMUL is enabled, then multiplications of 32-bit values whose
+ * result are truncated to the low 32 bits are assumed to be
+ * substantially more efficient than 32-bit multiplications that yield
+ * 64-bit results. This is typically the case on low-end ARM Cortex M
+ * systems (M0, M0+, M1, and arguably M3 and M4 as well).
+ *
+#define BR_LOMUL   1
+ */
+
 /*
  * When BR_SLOW_MUL is enabled, multiplications are assumed to be
  * substantially slow with regards to other integer operations, thus
@@ -127,4 +137,39 @@
 #define BR_USE_WIN32_TIME   1
  */
 
+/*
+ * When BR_ARMEL_CORTEXM_GCC is enabled, some operations are replaced with
+ * inline assembly which is shorter and/or faster. This should be used
+ * only when all of the following are true:
+ *   - target architecture is ARM in Thumb mode
+ *   - target endianness is little-endian
+ *   - compiler is GCC (or GCC-compatible for inline assembly syntax)
+ *
+ * This is meant for the low-end cores (Cortex M0, M0+, M1, M3).
+ * Note: if BR_LOMUL is not explicitly enabled or disabled, then
+ * enabling BR_ARMEL_CORTEXM_GCC also enables BR_LOMUL.
+ *
+#define BR_ARMEL_CORTEXM_GCC   1
+ */
+
+/*
+ * When BR_AES_X86NI is enabled, the AES implementation using the x86 "NI"
+ * instructions (dedicated AES opcodes) will be compiled. If this is not
+ * enabled explicitly, then that AES implementation will be compiled only
+ * if a compatible compiler is detected. If set explicitly to 0, the
+ * implementation will not be compiled at all.
+ *
+#define BR_AES_X86NI   1
+ */
+
+/*
+ * When BR_POWER8 is enabled, the AES implementation using the POWER ISA
+ * 2.07 opcodes (available on POWER8 processors and later) is compiled.
+ * If this is not enabled explicitly, then that implementation will be
+ * compiled only if a compatible compiler is detected, _and_ the target
+ * architecture is POWER8 or later.
+ *
+#define BR_POWER8   1
+ */
+
 #endif