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[Patch,AVR] Fix PR51050: Invalid RTL sharing of fp
- From: Georg-Johann Lay <avr at gjlay dot de>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Cc: Denis Chertykov <chertykov at gmail dot com>, Eric Weddington <eric dot weddington at atmel dot com>
- Date: Thu, 15 Dec 2011 00:23:03 +0100
- Subject: [Patch,AVR] Fix PR51050: Invalid RTL sharing of fp
This is fix for the RP. Is uses (reg:QI 28) instead of building SUBREG of frame
pointer.
Johann
PR target/51050
* config/avr/avr.c (expand_epilogue): Don't build SUBREG of fp.
(avr_prologue_setup_frame): Ditto.
Index: gcc/config/avr/avr.c
===================================================================
--- gcc/config/avr/avr.c (revision 182327)
+++ gcc/config/avr/avr.c (working copy)
@@ -994,7 +994,7 @@ avr_prologue_setup_frame (HOST_WIDE_INT
/* The high byte (r29) does not change:
Prefer SUBI (1 cycle) over ABIW (2 cycles, same size). */
- my_fp = simplify_gen_subreg (QImode, fp, Pmode, 0);
+ my_fp = all_regs_rtx[FRAME_POINTER_REGNUM];
}
/************ Method 1: Adjust frame pointer ************/
@@ -1292,7 +1292,7 @@ expand_epilogue (bool sibcall_p)
/* The high byte (r29) does not change:
Prefer SUBI (1 cycle) over SBIW (2 cycles). */
- my_fp = simplify_gen_subreg (QImode, fp, Pmode, 0);
+ my_fp = all_regs_rtx[FRAME_POINTER_REGNUM];
}
/********** Method 1: Adjust fp register **********/