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-rw-r--r--aes/src/asm64/aes128.asm5
1 files changed, 4 insertions, 1 deletions
diff --git a/aes/src/asm64/aes128.asm b/aes/src/asm64/aes128.asm
index c1349f4..4b18384 100644
--- a/aes/src/asm64/aes128.asm
+++ b/aes/src/asm64/aes128.asm
@@ -3,7 +3,10 @@
; For details, see https://github.com/egor-tensin/aes-tools.
; Distributed under the MIT License.
-; Copied from asm/aes128.asm
+; Copied from asm/aes128.asm, accounting for the calling convention changes.
+; The biggest difference is that __m128 arguments are passed via a pointer, not
+; via XMM registers like in 32-bit __fastcall. The best source is Agner's doc:
+; https://www.agner.org/optimize/calling_conventions.pdf
.code