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re PR tree-optimization/16807 ([lno] Weird loop unrolling)

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PR tree-optimization/16807
	* loop-iv.c (dump_iv_info): Dump invariants correctly.
	(iv_subreg, iv_extend): Express value of invariant purely in
	base field.

From-SVN: r85634
This commit is contained in:
Zdenek Dvorak 2004-08-06 11:40:39 +02:00 • committed by Zdenek Dvorak
parent 866cf03731
commit 6797f908ee
2 changed files with 46 additions and 9 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-08-06 Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>
PR tree-optimization/16807
* loop-iv.c (dump_iv_info): Dump invariants correctly.
(iv_subreg, iv_extend): Express value of invariant purely in
base field.
2004-08-06 Mark Mitchell <mark@codesourcery.com>
* config/arm/symbian.h (CC1_SPEC): Add -fno-short-enums.

48
gcc/loop-iv.c
View file

@ -104,17 +104,17 @@ dump_iv_info (FILE *file, struct rtx_iv *iv)
return;
}
if (iv->step == const0_rtx)
{
fprintf (file, "invariant ");
print_rtl (file, iv->base);
return;
}
if (iv->step == const0_rtx
&& !iv->first_special)
fprintf (file, "invariant ");
print_rtl (file, iv->base);
fprintf (file, " + ");
print_rtl (file, iv->step);
fprintf (file, " * iteration");
if (iv->step != const0_rtx)
{
fprintf (file, " + ");
print_rtl (file, iv->step);
fprintf (file, " * iteration");
}
fprintf (file, " (in %s)", GET_MODE_NAME (iv->mode));
if (iv->mode != iv->extend_mode)
@ -440,6 +440,21 @@ iv_constant (struct rtx_iv *iv, rtx cst, enum machine_mode mode)
static bool
iv_subreg (struct rtx_iv *iv, enum machine_mode mode)
{
/* If iv is invariant, just calculate the new value. */
if (iv->step == const0_rtx
&& !iv->first_special)
{
rtx val = get_iv_value (iv, const0_rtx);
val = lowpart_subreg (mode, val, iv->extend_mode);
iv->base = val;
iv->extend = NIL;
iv->mode = iv->extend_mode = mode;
iv->delta = const0_rtx;
iv->mult = const1_rtx;
return true;
}
if (iv->extend_mode == mode)
return true;
@ -465,6 +480,21 @@ iv_subreg (struct rtx_iv *iv, enum machine_mode mode)
static bool
iv_extend (struct rtx_iv *iv, enum rtx_code extend, enum machine_mode mode)
{
/* If iv is invariant, just calculate the new value. */
if (iv->step == const0_rtx
&& !iv->first_special)
{
rtx val = get_iv_value (iv, const0_rtx);
val = simplify_gen_unary (extend, mode, val, iv->extend_mode);
iv->base = val;
iv->extend = NIL;
iv->mode = iv->extend_mode = mode;
iv->delta = const0_rtx;
iv->mult = const1_rtx;
return true;
}
if (mode != iv->extend_mode)
return false;