From: John Arbuckle <programmingk...@gmail.com>
The assembler in most versions of Mac OS X is pretty old and does not
support the xgetbv instruction. To go around this problem, the raw
encoding of the instruction is used instead.
Signed-off-by: John Arbuckle <programmingk...@gmail.com>
Message-Id: <20180604215102.11002-1-programmingk...@gmail.com>
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
tcg/i386/tcg-target.inc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/tcg/i386/tcg-target.inc.c b/tcg/i386/tcg-target.inc.c
index 5357909fff..0d0ff524b7 100644
--- a/tcg/i386/tcg-target.inc.c
+++ b/tcg/i386/tcg-target.inc.c
@@ -3501,7 +3501,10 @@ static void tcg_target_init(TCGContext *s)
sure of not hitting invalid opcode. */
if (c & bit_OSXSAVE) {
unsigned xcrl, xcrh;
- asm ("xgetbv" : "=a" (xcrl), "=d" (xcrh) : "c" (0));
+ /* The xgetbv instruction is not available to older versions of
+ * the assembler, so we encode the instruction manually.
+ */
+ asm(".byte 0x0f, 0x01, 0xd0" : "=a" (xcrl), "=d" (xcrh) : "c" (0));
if ((xcrl & 6) == 6) {
have_avx1 = (c & bit_AVX) != 0;
have_avx2 = (b7 & bit_AVX2) != 0;
--
2.17.1
