From ecec2a9d0a1274a8c9b306f81bd7bd70cb494954 Mon Sep 17 00:00:00 2001 From: amylaar Date: Thu, 17 Jun 1999 13:35:59 +0000 Subject: [PATCH] * loop.c (strength_reduce): When doing biv->giv conversion, update reg note of NEXT->insn. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@27574 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 5 +++++ gcc/loop.c | 10 ++++++++-- 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index dabee24bdee..fe6a60cd307 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Thu Jun 17 21:34:24 1999 J"orn Rennecke + + * loop.c (strength_reduce): When doing biv->giv conversion, update + reg note of NEXT->insn. + Thu Jun 17 14:25:08 1999 Jeffrey A Law (law@cygnus.com) * loop.c (move_movables): Note issues with replacing REGs with diff --git a/gcc/loop.c b/gcc/loop.c index dcddba681b4..7bd014786f0 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -4198,7 +4198,7 @@ strength_reduce (scan_start, end, loop_top, insn_count, for (vp = &bl->biv, next = *vp; v = next, next = v->next_iv;) { HOST_WIDE_INT offset; - rtx set, add_val, old_reg, dest_reg, last_use_insn; + rtx set, add_val, old_reg, dest_reg, last_use_insn, note; int old_regno, new_regno; if (! v->always_executed @@ -4304,7 +4304,13 @@ strength_reduce (scan_start, end, loop_top, insn_count, REG_IV_TYPE (new_regno) = GENERAL_INDUCT; REG_IV_INFO (new_regno) = v; - + + /* If next_insn has a REG_EQUAL note that mentiones OLD_REG, + it must be replaced. */ + note = find_reg_note (next->insn, REG_EQUAL, NULL_RTX); + if (note && reg_mentioned_p (old_reg, XEXP (note, 0))) + XEXP (note, 0) = copy_rtx (SET_SRC (single_set (next->insn))); + /* Remove the increment from the list of biv increments, and record it as a giv. */ *vp = next; -- 2.11.4.GIT