Hi,
rdrand<mode>_1 must be marked with unspec_volatile since it returns
a different value every time. OK for trunk, 4.7 and 4.6?
Thanks.
H.J.
----
PR target/53416
* config/i386/i386.md (UNSPEC_RDRAND): Renamed to ...
(UNSPECV_RDRAND): This.
(rdrand<mode>_1): Updated.
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index cce78b5..9327acf 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -176,9 +176,6 @@
;; For CRC32 support
UNSPEC_CRC32
- ;; For RDRAND support
- UNSPEC_RDRAND
-
;; For BMI support
UNSPEC_BEXTR
@@ -208,6 +205,9 @@
UNSPECV_WRFSBASE
UNSPECV_WRGSBASE
+ ;; For RDRAND support
+ UNSPECV_RDRAND
+
;; For RTM support
UNSPECV_XBEGIN
UNSPECV_XEND
@@ -18399,9 +18399,9 @@
(define_insn "rdrand<mode>_1"
[(set (match_operand:SWI248 0 "register_operand" "=r")
- (unspec:SWI248 [(const_int 0)] UNSPEC_RDRAND))
+ (unspec_volatile:SWI248 [(const_int 0)] UNSPECV_RDRAND))
(set (reg:CCC FLAGS_REG)
- (unspec:CCC [(const_int 0)] UNSPEC_RDRAND))]
+ (unspec_volatile:CCC [(const_int 0)] UNSPECV_RDRAND))]
"TARGET_RDRND"
"rdrand\t%0"
[(set_attr "type" "other")
