From: Iain Sandoe <iain@sandoe.co.uk>
Date: Wed, 4 Sep 2019 19:24:42 +0000 (+0000)
Subject: [Darwin, PPC] Do not use longcall for 64b code.
X-Git-Tag: releases/gcc-7.5.0~167
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25df28cc40587caad97096d9c157988ba99ab9b4;p=thirdparty%2Fgcc.git

[Darwin, PPC] Do not use longcall for 64b code.

Fix wrong codegen; the 'native' tools do no emit the longcall in this
position.

2019-09-04  Iain Sandoe  <iain@sandoe.co.uk>

	Backport from mainline
	2019-06-27  Iain Sandoe  <iain@sandoe.co.uk>

	* config/rs6000/rs6000.c (darwin_rs6000_override_options): Do not
	use longcall for 64b code.

From-SVN: r275384
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ba006ac51821..8408f5b82f2d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2019-09-04  Iain Sandoe  <iain@sandoe.co.uk>
+
+	Backport from mainline
+	2019-06-27  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* config/rs6000/rs6000.c (darwin_rs6000_override_options): Do not
+	use longcall for 64b code.
+
 2019-09-04  Iain Sandoe  <iain@sandoe.co.uk>
 
 	Backport from mainline
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index ddf412137bb5..7a374cfd58c4 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -3834,6 +3834,15 @@ darwin_rs6000_override_options (void)
       rs6000_isa_flags |= OPTION_MASK_POWERPC64;
       warning (0, "-m64 requires PowerPC64 architecture, enabling");
     }
+
+  /* The linkers [ld64] that support 64Bit do not need the JBSR longcall
+     optimisation, and will not work with the most generic case (where the
+     symbol is undefined external, but there is no symbl stub).  */
+  if (TARGET_64BIT)
+    rs6000_default_long_calls = 0;
+
+  /* ld_classic is (so far) still used for kernel (static) code, and supports
+     the JBSR longcall / branch islands.  */
   if (flag_mkernel)
     {
       rs6000_default_long_calls = 1;