From d40bf399149c516da7ed2f513fd02b5526591945 Mon Sep 17 00:00:00 2001
From: ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 19 Feb 2004 15:24:02 +0000
Subject: [PATCH] * reload1.c (reload): Correct comment.
(scan_paradoxical_subregs): Remove #if 0 and old comment. *
doc/extend.texi (Local Reg Vars): Remove obsolete comment that
register variables are not used by reload.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@78100 138bc75d-0d04-0410-961f-82ee72b054a4
---
gcc/ChangeLog | 7 +++++++
gcc/doc/extend.texi | 5 +----
gcc/reload1.c | 18 ++++--------------
3 files changed, 12 insertions(+), 18 deletions(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 90bf8d50d557..6e1808bcb317 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2004-02-19 Ian Lance Taylor <ian@wasabisystems.com>
+
+ * reload1.c (reload): Correct comment.
+ (scan_paradoxical_subregs): Remove #if 0 and old comment.
+ * doc/extend.texi (Local Reg Vars): Remove obsolete comment that
+ register variables are not used by reload.
+
2004-02-19 Hans-Peter Nilsson <hp@axis.com>
PR target/14209
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 7c6b4fa8e277..13bd75f4e133 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -4417,10 +4417,7 @@ example, some 68000 operating systems call this register @code{%a5}.
Defining such a register variable does not reserve the register; it
remains available for other uses in places where flow control determines
-the variable's value is not live. However, these registers are made
-unavailable for use in the reload pass; excessive use of this feature
-leaves the compiler too few available registers to compile certain
-functions.
+the variable's value is not live.
This option does not guarantee that GCC will generate code that has
this variable in the register you specify at all times. You may not
diff --git a/gcc/reload1.c b/gcc/reload1.c
index dacf1b5e584d..b64abf1531b2 100644
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -707,10 +707,9 @@ reload (rtx first, int global)
CLEAR_HARD_REG_SET (bad_spill_regs_global);
- /* Look for REG_EQUIV notes; record what each pseudo is equivalent to.
- Also find all paradoxical subregs and find largest such for each pseudo.
- On machines with small register classes, record hard registers that
- are used for user variables. These can never be used for spills. */
+ /* Look for REG_EQUIV notes; record what each pseudo is equivalent
+ to. Also find all paradoxical subregs and find largest such for
+ each pseudo. */
num_eliminable_invariants = 0;
for (insn = first; insn; insn = NEXT_INSN (insn))
@@ -3713,9 +3712,7 @@ finish_spills (int global)
return something_changed;
}
-/* Find all paradoxical subregs within X and update reg_max_ref_width.
- Also mark any hard registers used to store user variables as
- forbidden from being used for spill registers. */
+/* Find all paradoxical subregs within X and update reg_max_ref_width. */
static void
scan_paradoxical_subregs (rtx x)
@@ -3727,13 +3724,6 @@ scan_paradoxical_subregs (rtx x)
switch (code)
{
case REG:
-#if 0
- if (SMALL_REGISTER_CLASSES && REGNO (x) < FIRST_PSEUDO_REGISTER
- && REG_USERVAR_P (x))
- SET_HARD_REG_BIT (bad_spill_regs_global, REGNO (x));
-#endif
- return;
-
case CONST_INT:
case CONST:
case SYMBOL_REF:
--
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