[committed] patch fixing PR97983

[committed] patch fixing PR97983

[Vladimir Makarov]

[-- Attachment #1: Type: text/plain, Size: 571 bytes --]

The following patch fixes

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97983

The patch was successfully bootstrapped on x86_64 and s390x (with 
--enable-languages=c,c++ --enable-checking=release --disable-multilib 
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions 
--enable-gnu-unique-object --enable-linker-build-\
id --with-gcc-major-version-only --with-linker-hash-style=gnu 
--enable-plugin --enable-initfini-array --with-isl 
--enable-gnu-indirect-function --with-long-double-128 --with-arch=zEC12 
--with-tune=z13 --enable-decimal-float)



[-- Attachment #2: pr97983.patch --]
[-- Type: text/x-patch, Size: 1782 bytes --]

commit 0ea3f28e49b1c936fae2b8a5a418440635c6b13a (HEAD -> master)
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date:   Wed Nov 25 17:06:13 2020 -0500

    [PR97983] LRA: Use the right emit func for putting insn in the destination BB.
    
    gcc/
    
    2020-11-25  Vladimir Makarov  <vmakarov@redhat.com>
    
            PR bootstrap/97983
            * lra.c (lra_process_new_insns): Use emit_insn_before_noloc or
            emit_insn_after_noloc with the destination BB.

diff --git a/gcc/lra.c b/gcc/lra.c
index 4ec0f466376..a79213e32e0 100644
--- a/gcc/lra.c
+++ b/gcc/lra.c
@@ -1908,13 +1908,9 @@ lra_process_new_insns (rtx_insn *insn, rtx_insn *before, rtx_insn *after,
 		  tmp = NEXT_INSN (tmp);
 		if (NOTE_INSN_BASIC_BLOCK_P (tmp))
 		  tmp = NEXT_INSN (tmp);
-		for (curr = tmp; curr != NULL; curr = NEXT_INSN (curr))
-		  if (INSN_P (curr))
-		    break;
 		/* Do not put reload insns if it is the last BB
-		   without actual insns.  In this case the reload insns
-		   can get null BB after emitting.  */
-		if (curr == NULL)
+		   without actual insns.  */
+		if (tmp == NULL)
 		  continue;
 		start_sequence ();
 		for (curr = after; curr != NULL_RTX; curr = NEXT_INSN (curr))
@@ -1927,7 +1923,11 @@ lra_process_new_insns (rtx_insn *insn, rtx_insn *before, rtx_insn *after,
 			     e->dest->index);
 		    dump_rtl_slim (lra_dump_file, copy, NULL, -1, 0);
 		  }
-		emit_insn_before (copy, tmp);
+		/* Use the right emit func for setting up BB_END/BB_HEAD: */
+		if (BB_END (e->dest) == PREV_INSN (tmp))
+		  emit_insn_after_noloc (copy, PREV_INSN (tmp), e->dest);
+		else
+		  emit_insn_before_noloc (copy, tmp, e->dest);
 		push_insns (last, PREV_INSN (copy));
 		setup_sp_offset (copy, last);
 		/* We can ignore BB live info here as it and reg notes