From: Philippe Mathieu-Daudé <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
---
tcg/tcg-op.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index ed0ab218a1..b56ae748b8 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -1822,6 +1822,14 @@ void tcg_gen_bswap16_i64(TCGv_i64 ret, TCGv_i64 arg, int
flags)
}
}
+/*
+ * bswap32_i64: 32-bit byte swap on the low bits of a 64-bit value.
+ *
+ * Byte pattern: xxxxabcd -> yyyydcba
+ *
+ * With TCG_BSWAP_IZ, x == zero, else undefined.
+ * With TCG_BSWAP_OZ, y == zero, with TCG_BSWAP_OS y == sign, else undefined.
+ */
void tcg_gen_bswap32_i64(TCGv_i64 ret, TCGv_i64 arg, int flags)
{
/* Only one extension flag may be present. */
@@ -1855,7 +1863,8 @@ void tcg_gen_bswap32_i64(TCGv_i64 ret, TCGv_i64 arg, int
flags)
} else {
tcg_gen_shri_i64(t1, t1, 32); /* t1 = ....dc.. */
}
- tcg_gen_or_i64(ret, t0, t1); /* ret = ssssdcba */
+ tcg_gen_or_i64(ret, t0, t1); /* ret = ssssdcba (OS) */
+ /* ....dcba (else) */
tcg_temp_free_i64(t0);
tcg_temp_free_i64(t1);
--
2.34.1
