From: Eric Botcazou <ebotcazou@adacore.com>
Date: Wed, 11 Sep 2019 10:41:27 +0000 (+0000)
Subject: re PR rtl-optimization/89795 (wrong code with -O2 -fno-dce -fno-forward-propagate... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0a237a94c206b53eb73baad2d75fbcca518df65e;p=gcc.git

re PR rtl-optimization/89795 (wrong code with -O2 -fno-dce -fno-forward-propagate -fno-sched-pressure)

	PR rtl-optimization/89795
	* rtlanal.c (nonzero_bits1) <SUBREG>: Do not propagate results from
	inner REGs to paradoxical SUBREGs if WORD_REGISTER_OPERATIONS is set.

From-SVN: r275635
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 33b43862051..3452012a45c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-09-11  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR rtl-optimization/89795
+	* rtlanal.c (nonzero_bits1) <SUBREG>: Do not propagate results from
+	inner REGs to paradoxical SUBREGs if WORD_REGISTER_OPERATIONS is set.
+
 2019-09-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/91723
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index 1fbbeda88b2..3a72db7572d 100644
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -4819,7 +4819,7 @@ nonzero_bits1 (const_rtx x, scalar_int_mode mode, const_rtx known_x,
 	       || ((extend_op = load_extend_op (inner_mode)) == SIGN_EXTEND
 		   ? val_signbit_known_set_p (inner_mode, nonzero)
 		   : extend_op != ZERO_EXTEND)
-	       || (!MEM_P (SUBREG_REG (x)) && !REG_P (SUBREG_REG (x))))
+	       || !MEM_P (SUBREG_REG (x)))
 	      && xmode_width > inner_width)
 	    nonzero
 	      |= (GET_MODE_MASK (GET_MODE (x)) & ~GET_MODE_MASK (inner_mode));
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index d4488b6789c..cd9821e09ff 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2019-09-11  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gcc.target/sparc/20161111-1.c: XFAIL redundant zero-extension test.
+
 2019-09-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/91723
diff --git a/gcc/testsuite/gcc.target/sparc/20161111-1.c b/gcc/testsuite/gcc.target/sparc/20161111-1.c
index eda8b0a9f12..8195fec8990 100644
--- a/gcc/testsuite/gcc.target/sparc/20161111-1.c
+++ b/gcc/testsuite/gcc.target/sparc/20161111-1.c
@@ -14,4 +14,4 @@ unsigned char ee_isdigit2(unsigned int i)
   return retval;
 }
 
-/* { dg-final { scan-assembler-not "and\t%" } } */
+/* { dg-final { scan-assembler-not "and\t%" { xfail *-*-* } } } */