[SH][committed] Fix PR 69713

[SH][committed] Fix PR 69713

[Oleg Endo]

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Hi,

The attached patch fixes PR 69713.  For details please see the comments
in the PR.

Tested on trunk and sh-elf with
make -k check RUNTESTFLAGS="--target_board=sh-sim\{-m2/-ml,-m2/-mb,
-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}"

Committed to trunk as r233324, 5 branch as r233326 and 4.9 branch as
r233329.

Cheers,
Oleg


gcc/ChangeLog
	PR target/69713
	* config/sh/sh.md (casesi_worker_0): Add T_REG use.

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Index: gcc/config/sh/sh.md
===================================================================
--- gcc/config/sh/sh.md	(revision 233314)
+++ gcc/config/sh/sh.md	(working copy)
@@ -11707,12 +11707,16 @@
 ;; ??? reload might clobber r0 if we use it explicitly in the RTL before
 ;; reload; using a R0_REGS pseudo reg is likely to give poor code.
 ;; So we keep the use of r0 hidden in a R0_REGS clobber until after reload.
+;;
+;; The use on the T_REG in the casesi_worker* patterns links the bounds
+;; checking insns and the table memory access.  See also PR 69713.
 (define_insn "casesi_worker_0"
   [(set (match_operand:SI 0 "register_operand" "=r,r")
 	(unspec:SI [(match_operand:SI 1 "register_operand" "0,r")
 		 (label_ref (match_operand 2 "" ""))] UNSPEC_CASESI))
    (clobber (match_scratch:SI 3 "=X,1"))
-   (clobber (match_scratch:SI 4 "=&z,z"))]
+   (clobber (match_scratch:SI 4 "=&z,z"))
+   (use (reg:SI T_REG))]
   "TARGET_SH1"
   "#")
 
@@ -11721,7 +11725,8 @@
 	(unspec:SI [(match_operand:SI 1 "register_operand" "")
 		    (label_ref (match_operand 2 "" ""))] UNSPEC_CASESI))
    (clobber (match_scratch:SI 3 ""))
-   (clobber (match_scratch:SI 4 ""))]
+   (clobber (match_scratch:SI 4))
+   (use (reg:SI T_REG))]
   "TARGET_SH1 && ! TARGET_SH2 && reload_completed"
   [(set (reg:SI R0_REG) (unspec:SI [(label_ref (match_dup 2))] UNSPEC_MOVA))
    (parallel [(set (match_dup 0)
@@ -11739,7 +11744,8 @@
 	(unspec:SI [(match_operand:SI 1 "register_operand" "")
 		    (label_ref (match_operand 2 "" ""))] UNSPEC_CASESI))
    (clobber (match_scratch:SI 3 ""))
-   (clobber (match_scratch:SI 4 ""))]
+   (clobber (match_scratch:SI 4))
+   (use (reg:SI T_REG))]
   "TARGET_SH2 && reload_completed"
   [(set (reg:SI R0_REG) (unspec:SI [(label_ref (match_dup 2))] UNSPEC_MOVA))
    (parallel [(set (match_dup 0)