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rs6000.c (rs6000_reg_live_or_pic_offset_p): Check TARGET_SINGLE_PIC_BASE for RS6000_PIC_OFFSET_TABLE_REGNUM.

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* config/rs6000/rs6000.c (rs6000_reg_live_or_pic_offset_p): Check
	TARGET_SINGLE_PIC_BASE for RS6000_PIC_OFFSET_TABLE_REGNUM.
	(rs6000_emit_prologue): Don't set PIC register if
	TARGET_SINGLE_PIC_BASE.
	* config/rs6000/rs6000.opt (msingle-pic-base): New option.
	* doc/invoke.texi (msingle-pic-base): Document.

From-SVN: r167283
This commit is contained in:
Joakim Tjernlund 2010-11-30 02:47:54 +01:00 • committed by Nathan Froyd
parent ddac6b7317
commit 042abba200
4 changed files with 26 additions and 1 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2010-11-29 Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
* config/rs6000/rs6000.c (rs6000_reg_live_or_pic_offset_p): Check
TARGET_SINGLE_PIC_BASE for RS6000_PIC_OFFSET_TABLE_REGNUM.
(rs6000_emit_prologue): Don't set PIC register if
TARGET_SINGLE_PIC_BASE.
* config/rs6000/rs6000.opt (msingle-pic-base): New option.
* doc/invoke.texi (msingle-pic-base): Document.
2010-11-29 H.J. Lu <hongjiu.lu@intel.com>
PR driver/46712

5
gcc/config/rs6000/rs6000.c
View file

@ -20032,8 +20032,10 @@ rs6000_reg_live_or_pic_offset_p (int reg)
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))));
}
@ -20688,6 +20690,9 @@ rs6000_emit_prologue (void)
insn = emit_insn (generate_set_vrsave (reg, info, 0));
}
if (TARGET_SINGLE_PIC_BASE)
return; /* Do not set PIC register */
/* If we are using RS6000_PIC_OFFSET_TABLE_REGNUM, we need to set it up. */
if ((TARGET_TOC && TARGET_MINIMAL_TOC && get_pool_size () != 0)
|| (DEFAULT_ABI == ABI_V4

4
gcc/config/rs6000/rs6000.opt
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@ -275,6 +275,10 @@ mupdate
Target Report RejectNegative InverseMask(NO_UPDATE, UPDATE)
Generate load/store with update instructions
msingle-pic-base
Target Report Var(TARGET_SINGLE_PIC_BASE) Init(0)
Do not load the PIC register in function prologues
mavoid-indexed-addresses
Target Report Var(TARGET_AVOID_XFORM) Init(-1) Save
Avoid generation of indexed load/store instructions when possible

9
gcc/doc/invoke.texi
View file

@ -780,7 +780,7 @@ See RS/6000 and PowerPC Options.
-mstrict-align -mno-strict-align -mrelocatable @gol
-mno-relocatable -mrelocatable-lib -mno-relocatable-lib @gol
-mtoc -mno-toc -mlittle -mlittle-endian -mbig -mbig-endian @gol
-mdynamic-no-pic -maltivec -mswdiv @gol
-mdynamic-no-pic -maltivec -mswdiv -msingle-pic-base @gol
-mprioritize-restricted-insns=@var{priority} @gol
-msched-costly-dep=@var{dependence_type} @gol
-minsert-sched-nops=@var{scheme} @gol
@ -15729,6 +15729,13 @@ relocatable, but that its external references are relocatable. The
resulting code is suitable for applications, but not shared
libraries.
@item -msingle-pic-base
@opindex msingle-pic-base
Treat the register used for PIC addressing as read-only, rather than
loading it in the prologue for each function. The run-time system is
responsible for initializing this register with an appropriate value
before execution begins.
@item -mprioritize-restricted-insns=@var{priority}
@opindex mprioritize-restricted-insns
This option controls the priority that is assigned to