tcg/tcg-op: Document bswap64_i64() byte pattern

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230823145542.79633-6-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index b56ae748b8cf8d3759172b03a0187e7a25e36e8c..22c682c28edb8a2cf8856f4ff722d7053a1b659a 100644 (file)
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -1871,6 +1871,11 @@ void tcg_gen_bswap32_i64(TCGv_i64 ret, TCGv_i64 arg, int flags)
     }
 }
 
+/*
+ * bswap64_i64: 64-bit byte swap on a 64-bit value.
+ *
+ * Byte pattern: abcdefgh -> hgfedcba
+ */
 void tcg_gen_bswap64_i64(TCGv_i64 ret, TCGv_i64 arg)
 {
     if (TCG_TARGET_REG_BITS == 32) {