[gcc/devel/omp/gcc-9] Backport fix for PR target/91769

[Tobias Burnus]

https://gcc.gnu.org/g:aeee85cef5173e4e6068087f25213c2012ed495d

commit aeee85cef5173e4e6068087f25213c2012ed495d
Author: Dragan Mladjenovic <dmladjenovic@wavecomp.com>
Date:   Fri Oct 4 11:10:01 2019 +0000

    Backport fix for PR target/91769
    
    gcc/ChangeLog:
    
    2019-10-04  Dragan Mladjenovic <dmladjenovic@wavecomp.com>
    
    	Backport from mainline
    	2019-10-03  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>
    
    		PR target/91769
    		* config/mips/mips.c (mips_split_move): Use reg_overlap_mentioned_p
    		instead of REGNO equality check on addr.reg.
    
    gcc/testsuite/ChangeLog:
    
    2019-10-04  Dragan Mladjenovic <dmladjenovic@wavecomp.com>
    
    	Backport from mainline
    	2019-10-03  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>
    
    		PR target/91769
    		* gcc.target/mips/pr91769.c: New test.
    
    From-SVN: r276570

Diff:
---
 gcc/ChangeLog                           | 11 ++++++++++-
 gcc/config/mips/mips.c                  |  2 +-
 gcc/testsuite/ChangeLog                 |  8 ++++++++
 gcc/testsuite/gcc.target/mips/pr91769.c | 19 +++++++++++++++++++
 4 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ac7ae9ff..39e5009 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,4 +1,13 @@
-	2019-10-04  Dragan Mladjenovic <dmladjenovic@wavecomp.com>
+2019-10-04  Dragan Mladjenovic <dmladjenovic@wavecomp.com>
+
+	Backport from mainline
+	2019-10-03  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>
+
+	PR target/91769
+	* config/mips/mips.c (mips_split_move): Use reg_overlap_mentioned_p
+	instead of REGNO equality check on addr.reg.
+
+2019-10-04  Dragan Mladjenovic <dmladjenovic@wavecomp.com>
 
 	Backport from mainline
 	2019-07-07  Richard Sandiford  <richard.sandiford@arm.com>
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 5342927..d758fbf 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -4862,7 +4862,7 @@ mips_split_move (rtx dest, rtx src, enum mips_split_type split_type, rtx insn_)
 		{
 		  rtx tmp = XEXP (src, 0);
 		  mips_classify_address (&addr, tmp, GET_MODE (tmp), true);
-		  if (addr.reg && REGNO (addr.reg) != REGNO (dest))
+		  if (addr.reg && !reg_overlap_mentioned_p (dest, addr.reg))
 		    validate_change (next, &SET_SRC (set), src, false);
 		}
 	      else
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 362ed17..fb7965f 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2019-10-04  Dragan Mladjenovic <dmladjenovic@wavecomp.com>
+
+	Backport from mainline	
+	2019-10-03  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>
+
+	PR target/91769
+	* gcc.target/mips/pr91769.c: New test.
+
 2019-10-02  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	Backport from mainline
diff --git a/gcc/testsuite/gcc.target/mips/pr91769.c b/gcc/testsuite/gcc.target/mips/pr91769.c
new file mode 100644
index 0000000..c9ad70d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/mips/pr91769.c
@@ -0,0 +1,19 @@
+/* PR target/91769 */
+/* { dg-do compile } */
+/* { dg-skip-if "naming registers makes this a code quality test" { *-*-* } { "-O0" "-g" } { "" } } */
+/* { dg-options "-EL -mgp32 -mhard-float" } */
+
+NOCOMPRESSION double
+foo (void)
+{
+  register double* pf __asm__ ("$a1");
+  __asm__ __volatile__ ("":"=r"(pf));
+  double f = *pf;
+
+  if (f != f)
+    f = -f;
+  return f;
+}
+
+/* { dg-final { scan-assembler-not "lw\t\\\$4,0\\(\\\$5\\)\n\tlw\t\\\$5,4\\(\\\$5\\)\n\tldc1\t\\\$.*,0\\(\\\$5\\)" } } */
+/* { dg-final { scan-assembler "lw\t\\\$4,0\\(\\\$5\\)\n\tlw\t\\\$5,4\\(\\\$5\\)\n\tmtc1\t\\\$4,\\\$.*\n\tmthc1\t\\\$5,\\\$.*" } } */