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rs6000: Use unspec_volatile for darn (PR91481)

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Every call to darn should deliver a *new* random number; such calls
should not be CSEd together.  So they should be unspec_volatile, not
plain unspec.


	PR target/91481
	* config/rs6000/rs6000.md (unspec): Delete UNSPEC_DARN, UNSPEC_DARN_32,
	and UNSPEC_DARN_RAW.
	(unspecv): New enumerator values UNSPECV_DARN, UNSPECV_DARN_32, and
	UNSPECV_DARN_RAW.
	(darn_32): Use an unspec_volatile, and UNSPECV_DARN_32.
	(darn_raw): Use an unspec_volatile, and UNSPECV_DARN_RAW.
	(darn): Use an unspec_volatile, and UNSPECV_DARN.

From-SVN: r274835
This commit is contained in:
Segher Boessenkool 2019-08-22 21:36:21 +02:00 • committed by Segher Boessenkool
parent 71278ecd4e
commit e99bfdd2a8
2 changed files with 17 additions and 6 deletions
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11
gcc/ChangeLog
View file

@ -1,3 +1,14 @@
2019-08-22 Segher Boessenkool <segher@kernel.crashing.org>
PR target/91481
* config/rs6000/rs6000.md (unspec): Delete UNSPEC_DARN, UNSPEC_DARN_32,
and UNSPEC_DARN_RAW.
(unspecv): New enumerator values UNSPECV_DARN, UNSPECV_DARN_32, and
UNSPECV_DARN_RAW.
(darn_32): Use an unspec_volatile, and UNSPECV_DARN_32.
(darn_raw): Use an unspec_volatile, and UNSPECV_DARN_RAW.
(darn): Use an unspec_volatile, and UNSPECV_DARN.
2019-08-22 Segher Boessenkool <segher@kernel.crashing.org>
* config/rs6000/altivec.md (unspec): Delete UNSPEC_DARN, UNSPEC_DARN_32,

12
gcc/config/rs6000/rs6000.md
View file

@ -134,9 +134,6 @@
UNSPEC_LSQ
UNSPEC_FUSION_GPR
UNSPEC_STACK_CHECK
UNSPEC_DARN
UNSPEC_DARN_32
UNSPEC_DARN_RAW
UNSPEC_CMPRB
UNSPEC_CMPRB2
UNSPEC_CMPEQB
@ -168,6 +165,9 @@
UNSPECV_EH_RR ; eh_reg_restore
UNSPECV_ISYNC ; isync instruction
UNSPECV_MFTB ; move from time base
UNSPECV_DARN ; darn 1 (deliver a random number)
UNSPECV_DARN_32 ; darn 2
UNSPECV_DARN_RAW ; darn 0
UNSPECV_NLGR ; non-local goto receiver
UNSPECV_MFFS ; Move from FPSCR
UNSPECV_MFFSL ; Move from FPSCR light instruction version
@ -14387,21 +14387,21 @@
(define_insn "darn_32"
[(set (match_operand:SI 0 "register_operand" "=r")
(unspec:SI [(const_int 0)] UNSPEC_DARN_32))]
(unspec_volatile:SI [(const_int 0)] UNSPECV_DARN_32))]
"TARGET_P9_MISC"
"darn %0,0"
[(set_attr "type" "integer")])
(define_insn "darn_raw"
[(set (match_operand:DI 0 "register_operand" "=r")
(unspec:DI [(const_int 0)] UNSPEC_DARN_RAW))]
(unspec_volatile:DI [(const_int 0)] UNSPECV_DARN_RAW))]
"TARGET_P9_MISC && TARGET_64BIT"
"darn %0,2"
[(set_attr "type" "integer")])
(define_insn "darn"
[(set (match_operand:DI 0 "register_operand" "=r")
(unspec:DI [(const_int 0)] UNSPEC_DARN))]
(unspec_volatile:DI [(const_int 0)] UNSPECV_DARN))]
"TARGET_P9_MISC && TARGET_64BIT"
"darn %0,1"
[(set_attr "type" "integer")])