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* loop.c (emit_iv_add_mult): Revert last change.

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From-SVN: r33302
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Richard Henderson 2000-04-20 19:56:58 -07:00 committed by Richard Henderson
parent c52fbf0f79
commit 9e52563514
2 changed files with 9 additions and 51 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2000-04-20 Richard Henderson <rth@cygnus.com>
* loop.c (emit_iv_add_mult): Revert last change.
2000-04-20 Zack Weinberg <zack@wolery.cumb.org>
* cpplib.h (enum cpp_ttype): Add token types for all

56
gcc/loop.c
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@ -7640,24 +7640,11 @@ emit_iv_add_mult (b, m, a, reg, insert_before)
{
rtx seq;
rtx result;
rtx last;
rtx set;
rtx exp;
enum machine_mode mode = GET_MODE (reg);
/* Prevent unexpected sharing of these rtx. */
a = copy_rtx (a);
b = copy_rtx (b);
/* We may be faced to (plus (symbol_ref) (const_int)). We want to simplify
this to CONST rtx. */
exp = simplify_rtx (a);
if (exp)
a = exp;
exp = simplify_rtx (b);
if (exp)
b = exp;
/* Increase the lifetime of any invariants moved further in code. */
update_reg_last_use (a, insert_before);
update_reg_last_use (b, insert_before);
@ -7670,7 +7657,7 @@ emit_iv_add_mult (b, m, a, reg, insert_before)
seq = gen_sequence ();
end_sequence ();
last = emit_insn_before (seq, insert_before);
emit_insn_before (seq, insert_before);
/* It is entirely possible that the expansion created lots of new
registers. Iterate over the sequence we just created and
@ -7681,47 +7668,14 @@ emit_iv_add_mult (b, m, a, reg, insert_before)
int i;
for (i = 0; i < XVECLEN (seq, 0); ++i)
{
set = single_set (XVECEXP (seq, 0, i));
rtx set = single_set (XVECEXP (seq, 0, i));
if (set && GET_CODE (SET_DEST (set)) == REG)
record_base_value (REGNO (SET_DEST (set)), SET_SRC (set), 0);
}
last = XVECEXP (seq, 0, i - 1);
}
else
{
set = single_set (last);
if (set && GET_CODE (SET_DEST (set)) == REG)
record_base_value (REGNO (SET_DEST (set)), SET_SRC (set), 0);
}
if (!last)
return;
/* Sequence really ought to end by set storing final value to the register.
Attach note indicating expression we've just calculated to it. This is
important for second run of loop optimizer to understand strength reduced
givs from the first run. */
if (GET_CODE (last) != INSN)
abort();
set = single_set (last);
if (!set)
return;
if (SET_DEST (set) != reg)
abort();
/* In case we start to emit some usefull notes to these insns, get abort
here, since we need to decide what information is more important. */
if (find_reg_note (last, REG_EQUIV, NULL_RTX)
|| find_reg_note (last, REG_EQUAL, NULL_RTX))
abort();
/* Expression we've just caluclated. */
exp = simplify_gen_binary (PLUS, mode,
simplify_gen_binary (MULT, mode, b, m),
a);
REG_NOTES (last)
= gen_rtx_EXPR_LIST (REG_EQUAL,
exp,
REG_NOTES (last));
else if (GET_CODE (seq) == SET
&& GET_CODE (SET_DEST (seq)) == REG)
record_base_value (REGNO (SET_DEST (seq)), SET_SRC (seq), 0);
}
/* Test whether A * B can be computed without