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(tablejump): Rework to look like normal add but verify that label is for next insn and is tablejump...

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(tablejump): Rework to look like normal add but verify that label is
for next insn and is tablejump; look for ADDR_DIFF_ELT.

From-SVN: r7831
This commit is contained in:
Richard Kenner 1994-07-30 12:54:26 -04:00
parent 260ced47a7
commit 96c9d70dda
1 changed files with 12 additions and 10 deletions
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22
gcc/config/alpha/alpha.md
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@ -2546,8 +2546,9 @@
(define_expand "tablejump"
[(set (match_dup 3)
(sign_extend:DI (match_operand:SI 0 "register_operand" "")))
(parallel [(set (pc) (plus:DI (match_dup 3) (reg:DI 29)))
(use (label_ref (match_operand 1 "" "")))
(parallel [(set (pc)
(plus:DI (match_dup 3)
(label_ref:DI (match_operand 1 "" ""))))
(clobber (match_scratch:DI 2 "=r"))])]
""
"
@ -2556,19 +2557,20 @@
(define_insn ""
[(set (pc)
(plus:DI (match_operand:DI 0 "register_operand" "r")
(reg:DI 29)))
(use (label_ref (match_operand 1 "" "")))
(label_ref:DI (match_operand 1 "" ""))))
(clobber (match_scratch:DI 2 "=r"))]
""
"next_active_insn (insn) != 0
&& GET_CODE (PATTERN (next_active_insn (insn))) == ADDR_DIFF_VEC
&& PREV_INSN (next_active_insn (insn)) == operands[1]"
"*
{ rtx best_label = 0;
rtx jump_table_insn = next_active_insn (operands[1]);
if (GET_CODE (jump_table_insn) == JUMP_INSN
&& GET_CODE (PATTERN (jump_table_insn)) == ADDR_VEC)
&& GET_CODE (PATTERN (jump_table_insn)) == ADDR_DIFF_VEC)
{
rtx jump_table = PATTERN (jump_table_insn);
int n_labels = XVECLEN (jump_table, 0);
int n_labels = XVECLEN (jump_table, 1);
int best_count = -1;
int i, j;
@ -2577,12 +2579,12 @@
int count = 1;
for (j = i + 1; j < n_labels; j++)
if (XEXP (XVECEXP (jump_table, 0, i), 0)
== XEXP (XVECEXP (jump_table, 0, j), 0))
if (XEXP (XVECEXP (jump_table, 1, i), 0)
== XEXP (XVECEXP (jump_table, 1, j), 0))
count++;
if (count > best_count)
best_count = count, best_label = XVECEXP (jump_table, 0, i);
best_count = count, best_label = XVECEXP (jump_table, 1, i);
}
}