[(set_attr "op_type" "RR<E>")
(set_attr "z10prop" "z10_super_c_E1")])
-(define_insn_and_split "*negdi2_31"
+(define_insn "*negdi2_31"
[(set (match_operand:DI 0 "register_operand" "=d")
(neg:DI (match_operand:DI 1 "register_operand" "d")))
(clobber (reg:CC CC_REGNUM))]
"!TARGET_ZARCH"
- "#"
- "&& reload_completed"
+ "#")
+
+; Split a DImode NEG on 31bit into 2 SImode NEGs
+
+; Doing the twos complement separately on the SImode parts does an
+; unwanted +1 on the high part which needs to be subtracted afterwards
+; ... unless the +1 on the low part created an overflow.
+
+(define_split
+ [(set (match_operand:DI 0 "register_operand" "")
+ (neg:DI (match_operand:DI 1 "register_operand" "")))
+ (clobber (reg:CC CC_REGNUM))]
+ "!TARGET_ZARCH
+ && (REGNO (operands[0]) == REGNO (operands[1])
+ || s390_split_ok_p (operands[0], operands[1], DImode, 0))
+ && reload_completed"
[(parallel
[(set (match_dup 2) (neg:SI (match_dup 3)))
(clobber (reg:CC CC_REGNUM))])
operands[5] = operand_subword (operands[1], 1, 0, DImode);
operands[6] = gen_label_rtx ();")
+; Like above but first make a copy of the low part of the src operand
+; since it might overlap with the high part of the destination.
+
+(define_split
+ [(set (match_operand:DI 0 "register_operand" "")
+ (neg:DI (match_operand:DI 1 "register_operand" "")))
+ (clobber (reg:CC CC_REGNUM))]
+ "!TARGET_ZARCH
+ && s390_split_ok_p (operands[0], operands[1], DImode, 1)
+ && reload_completed"
+ [; Make a backup of op5 first
+ (set (match_dup 4) (match_dup 5))
+ ; Setting op2 here might clobber op5
+ (parallel
+ [(set (match_dup 2) (neg:SI (match_dup 3)))
+ (clobber (reg:CC CC_REGNUM))])
+ (parallel
+ [(set (reg:CCAP CC_REGNUM)
+ (compare:CCAP (neg:SI (match_dup 4)) (const_int 0)))
+ (set (match_dup 4) (neg:SI (match_dup 4)))])
+ (set (pc)
+ (if_then_else (ne (reg:CCAP CC_REGNUM) (const_int 0))
+ (pc)
+ (label_ref (match_dup 6))))
+ (parallel
+ [(set (match_dup 2) (plus:SI (match_dup 2) (const_int -1)))
+ (clobber (reg:CC CC_REGNUM))])
+ (match_dup 6)]
+ "operands[2] = operand_subword (operands[0], 0, 0, DImode);
+ operands[3] = operand_subword (operands[1], 0, 0, DImode);
+ operands[4] = operand_subword (operands[0], 1, 0, DImode);
+ operands[5] = operand_subword (operands[1], 1, 0, DImode);
+ operands[6] = gen_label_rtx ();")
+
;
; neg(df|sf)2 instruction pattern(s).
;