From: Jakub Jelinek <jakub@redhat.com>
Date: Fri, 22 Jun 2018 20:56:25 +0000 (+0200)
Subject: backport: re PR inline-asm/84941 (internal compiler error: in reg_overlap_mentioned_p... 
X-Git-Tag: releases/gcc-7.4.0~353
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5832c163cf8ab089d402aff3a371a96e9598b748;p=thirdparty%2Fgcc.git

backport: re PR inline-asm/84941 (internal compiler error: in reg_overlap_mentioned_p, at rtlanal.c:1870 (reg_overlap_mentioned_p()/match_asm_constraints_1()))

	Backported from mainline
	2018-03-22  Jakub Jelinek  <jakub@redhat.com>

	PR inline-asm/84941
	* function.c (match_asm_constraints_1): Don't do the optimization
	if input isn't a REG, SUBREG, MEM or constant.

	* gcc.dg/pr84941.c: New test.

From-SVN: r261936
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c50b4c8c9fc9..8320ac48e72b 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -3,6 +3,10 @@
 	Backported from mainline
 	2018-03-22  Jakub Jelinek  <jakub@redhat.com>
 
+	PR inline-asm/84941
+	* function.c (match_asm_constraints_1): Don't do the optimization
+	if input isn't a REG, SUBREG, MEM or constant.
+
 	PR sanitizer/85018
 	* dwarf2asm.c (dw2_output_indirect_constant_1): Set
 	DECL_INITIAL (decl) to decl at the end.
diff --git a/gcc/function.c b/gcc/function.c
index 21eb586a8f7b..ebb8aaf0cf07 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -6577,7 +6577,9 @@ match_asm_constraints_1 (rtx_insn *insn, rtx *p_sets, int noutputs)
       if (! REG_P (output)
 	  || rtx_equal_p (output, input)
 	  || (GET_MODE (input) != VOIDmode
-	      && GET_MODE (input) != GET_MODE (output)))
+	      && GET_MODE (input) != GET_MODE (output))
+	  || !(REG_P (input) || SUBREG_P (input)
+	       || MEM_P (input) || CONSTANT_P (input)))
 	continue;
 
       /* We can't do anything if the output is also used as input,
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 9b18005b0796..13b3b3ceaee1 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,6 +1,11 @@
 2018-06-22  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from mainline
+	2018-03-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR inline-asm/84941
+	* gcc.dg/pr84941.c: New test.
+
 	2018-03-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/84999
diff --git a/gcc/testsuite/gcc.dg/pr84941.c b/gcc/testsuite/gcc.dg/pr84941.c
new file mode 100644
index 000000000000..6f4674e54f03
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr84941.c
@@ -0,0 +1,10 @@
+/* PR inline-asm/84941 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+void
+foo (void)
+{
+  short *b[1] = { 0 };
+  asm volatile ("" : "=m,m" (b), "=r,r" (b) : "1,p" (b));
+}