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rs6000: Rewrite rs6000_reg_live_or_pic_offset_p

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This function is quite a puzzle; untangle it.  No functional change.


2015-10-31  Segher Boessenkool  <segher@kernel.crashing.org>

	* config/rs6000/rs6000.c (rs6000_reg_live_or_pic_offset_p): Rewrite.

From-SVN: r229634
This commit is contained in:
Segher Boessenkool 2015-10-31 20:50:09 +01:00 • committed by Segher Boessenkool
parent f44c1eb7e1
commit ee5c0d8af9
2 changed files with 24 additions and 15 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2015-10-31 Segher Boessenkool <segher@kernel.crashing.org>
* config/rs6000/rs6000.c (rs6000_reg_live_or_pic_offset_p): Rewrite.
2015-10-31 Segher Boessenkool <segher@kernel.crashing.org>
* config/rs6000/rs6000.c (rs6000_reg_live_or_pic_offset_p): Use the

35
gcc/config/rs6000/rs6000.c
View file

@ -22021,22 +22021,27 @@ save_reg_p (int r)
static bool
rs6000_reg_live_or_pic_offset_p (int reg)
{
/* If the function calls eh_return, claim used all the registers that would
be checked for liveness otherwise. This is required for the PIC offset
register with -mminimal-toc on AIX, as it is advertised as "fixed" for
register allocation purposes in this case. */
/* We need to mark the PIC offset register live for the same conditions
as it is set up, or otherwise it won't be saved before we clobber it. */
return (((crtl->calls_eh_return || df_regs_ever_live_p (reg))
&& (!call_used_regs[reg]
|| (reg == RS6000_PIC_OFFSET_TABLE_REGNUM
&& !TARGET_SINGLE_PIC_BASE
&& TARGET_TOC && TARGET_MINIMAL_TOC)))
|| (reg == RS6000_PIC_OFFSET_TABLE_REGNUM
&& !TARGET_SINGLE_PIC_BASE
&& ((DEFAULT_ABI == ABI_V4 && flag_pic != 0)
|| (DEFAULT_ABI == ABI_DARWIN && flag_pic)
|| (TARGET_TOC && TARGET_MINIMAL_TOC
&& get_pool_size () != 0))));
if (reg == RS6000_PIC_OFFSET_TABLE_REGNUM && !TARGET_SINGLE_PIC_BASE)
{
if (TARGET_TOC && TARGET_MINIMAL_TOC
&& (crtl->calls_eh_return
|| df_regs_ever_live_p (reg)
|| get_pool_size ()))
return true;
if ((DEFAULT_ABI == ABI_V4 || DEFAULT_ABI == ABI_DARWIN)
&& flag_pic)
return true;
}
/* If the function calls eh_return, claim used all the registers that would
be checked for liveness otherwise. */
return ((crtl->calls_eh_return || df_regs_ever_live_p (reg))
&& !call_used_regs[reg]);
}
/* Return the first fixed-point register that is required to be