From: Bernd Schmidt <bernds@codesourcery.com>
To: GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Handle multi-word regsiters in REG_CFA_RESTORE notes
Date: Thu, 15 Sep 2011 02:42:00 -0000 [thread overview]
Message-ID: <4E7150E4.10004@codesourcery.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 407 bytes --]
While testing the altest iteration of shrink-wrapping on mips-elf, a new
failure showed up in gcc.dg/pr43139.c. When restoring floating-point
registers, we attach REG_CFA_RESTORE notes for DFmode registers, but the
dwarf2cfi code only records a single regno for such a multiword hard reg.
Fixed with this patch, tested with shrink-wrapping on mips-elf (default
multilib plus two with -mips16). Ok?
Bernd
[-- Attachment #2: cfa-multiword.diff --]
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* dwarf2cfi.c (dwarf2out_frame_debug_cfa_expression): Handle
multi-word registers.
Index: gcc/dwarf2cfi.c
===================================================================
--- gcc/dwarf2cfi.c (revision 178734)
+++ gcc/dwarf2cfi.c (working copy)
@@ -1236,10 +1236,15 @@ dwarf2out_frame_debug_cfa_expression (rt
static void
dwarf2out_frame_debug_cfa_restore (rtx reg)
{
- unsigned int regno = dwf_regno (reg);
+ unsigned int orig_regno = REGNO (reg);
+ int nregs = hard_regno_nregs[orig_regno][GET_MODE (reg)];
+ while (nregs-- > 0)
+ {
+ unsigned int regno = DWARF_FRAME_REGNUM (orig_regno + nregs);
- add_cfi_restore (regno);
- update_row_reg_save (cur_row, regno, NULL);
+ add_cfi_restore (regno);
+ update_row_reg_save (cur_row, regno, NULL);
+ }
}
/* A subroutine of dwarf2out_frame_debug, process a REG_CFA_WINDOW_SAVE.
next reply other threads:[~2011-09-15 1:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-15 2:42 Bernd Schmidt [this message]
2011-09-15 20:41 ` Richard Henderson
2011-09-21 15:14 ` Bernd Schmidt
2011-09-21 17:47 ` Richard Henderson
2011-09-22 22:09 ` Bernd Schmidt
2011-09-25 19:54 ` Richard Sandiford
2011-09-27 12:57 ` Bernd Schmidt
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