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File gcc7-pfe-0006-Backport-IBM-Z-Use-the-dedicated-NOP-instructions-fo.patch of Package gcc7 (Revision d4dab956e317b26296499cd1275aa8e1)

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From 93132e0ab8aacedc740513c8e3d4ffd3bb0b8db7 Mon Sep 17 00:00:00 2001
From: Andreas Krebbel <krebbel@linux.vnet.ibm.com>
Date: Fri, 6 Apr 2018 07:45:42 +0000
Subject: [PATCH 06/22] Backport IBM Z: Use the dedicated NOP instructions for
 "nop"

We still use lr r0,r0 as a NOP instruction although we have some kind
of dedicated NOP instruction (nopr) which maps to a "branch never".

As a side-effect this fixes testcases scanning for NOPs
e.g. patchable_function_entry-*.

As another side-effect this makes it difficult to distingiush NOPs
generated for hotpatching from NOPs added when using -O0 to attach
location information to it.  Hence I had to make sure that the hotpatch
testcases get skipped when compiling without optimization.

2021-10-07  Giuliano Belinassi  <gbelinassi@suse.de>

Backport from mainline
	gcc/ChangeLog:

2018-04-06  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

* config/s390/s390.c (s390_z10_optimize_cmp): Expand dedicated NOP
	instructions.
	* config/s390/s390.md (UNSPECV_NOP_LR_0, UNSPECV_NOP_LR_1): New
	constant definitions.
	("nop"): lr 0,0 -> nopr r0
	("nop_lr0", "nop_lr1"): New insn definitions.

gcc/testsuite/ChangeLog:

2018-04-06  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

* gcc.target/s390/s390.exp: Remove -O0 from list of torture
	options.
	* gcc.target/s390/hotpatch-1.c: Skip when building without
	optimization.
	* gcc.target/s390/hotpatch-10.c: Likewise.
	* gcc.target/s390/hotpatch-11.c: Likewise.
	* gcc.target/s390/hotpatch-12.c: Likewise.
	* gcc.target/s390/hotpatch-13.c: Likewise.
	* gcc.target/s390/hotpatch-14.c: Likewise.
	* gcc.target/s390/hotpatch-15.c: Likewise.
	* gcc.target/s390/hotpatch-16.c: Likewise.
	* gcc.target/s390/hotpatch-17.c: Likewise.
	* gcc.target/s390/hotpatch-18.c: Likewise.
	* gcc.target/s390/hotpatch-19.c: Likewise.
	* gcc.target/s390/hotpatch-2.c: Likewise.
	* gcc.target/s390/hotpatch-3.c: Likewise.
	* gcc.target/s390/hotpatch-4.c: Likewise.
	* gcc.target/s390/hotpatch-5.c: Likewise.
	* gcc.target/s390/hotpatch-6.c: Likewise.
	* gcc.target/s390/hotpatch-7.c: Likewise.
	* gcc.target/s390/hotpatch-8.c: Likewise.
	* gcc.target/s390/hotpatch-9.c: Likewise.
---
 gcc/config/s390/s390.c                      |  4 ++--
 gcc/config/s390/s390.md                     | 17 +++++++++++++++--
 gcc/testsuite/gcc.target/s390/hotpatch-1.c  |  7 +++++++
 gcc/testsuite/gcc.target/s390/hotpatch-10.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-11.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-12.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-13.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-14.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-15.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-16.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-17.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-18.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-19.c |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-2.c  |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-3.c  |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-4.c  |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-5.c  |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-6.c  |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-7.c  |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-8.c  |  1 +
 gcc/testsuite/gcc.target/s390/hotpatch-9.c  |  1 +
 gcc/testsuite/gcc.target/s390/s390.exp      |  2 +-
 22 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/gcc/config/s390/s390.c b/gcc/config/s390/s390.c
index 0161ba03ff3..b1db263d37c 100644
--- a/gcc/config/s390/s390.c
+++ b/gcc/config/s390/s390.c
@@ -13966,9 +13966,9 @@ s390_z10_optimize_cmp (rtx_insn *insn)
 	  && s390_non_addr_reg_read_p (*op0, prev_insn))
 	{
 	  if (REGNO (*op1) == 0)
-	    emit_insn_after (gen_nop1 (), insn);
+	    emit_insn_after (gen_nop_lr1 (), insn);
 	  else
-	    emit_insn_after (gen_nop (), insn);
+	    emit_insn_after (gen_nop_lr0 (), insn);
 	  insn_added_p = true;
 	}
       else
diff --git a/gcc/config/s390/s390.md b/gcc/config/s390/s390.md
index bb399354855..e134d7f2972 100644
--- a/gcc/config/s390/s390.md
+++ b/gcc/config/s390/s390.md
@@ -267,6 +267,10 @@
    UNSPECV_CAS
    UNSPECV_ATOMIC_OP
 
+   ; Non-branch nops used for compare-and-branch adjustments on z10
+   UNSPECV_NOP_LR_0
+   UNSPECV_NOP_LR_1
+
    ; Hotpatching (unremovable NOPs)
    UNSPECV_NOP_2_BYTE
    UNSPECV_NOP_4_BYTE
@@ -11006,12 +11010,21 @@
 (define_insn "nop"
   [(const_int 0)]
   ""
+  "nopr\t%%r0"
+  [(set_attr "op_type" "RR")])
+
+; non-branch NOPs required for optimizing compare-and-branch patterns
+; on z10
+
+(define_insn "nop_lr0"
+  [(unspec_volatile [(const_int 0)] UNSPECV_NOP_LR_0)]
+  ""
   "lr\t0,0"
   [(set_attr "op_type" "RR")
    (set_attr "z10prop"  "z10_fr_E1")])
 
-(define_insn "nop1"
-  [(const_int 1)]
+(define_insn "nop_lr1"
+  [(unspec_volatile [(const_int 0)] UNSPECV_NOP_LR_1)]
   ""
   "lr\t1,1"
   [(set_attr "op_type" "RR")])
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-1.c b/gcc/testsuite/gcc.target/s390/hotpatch-1.c
index 5f0f2e19349..67e101ee318 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-1.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-1.c
@@ -3,6 +3,13 @@
 /* { dg-do compile } */
 /* { dg-options "-mzarch" } */
 
+/* Without optimization extra NOPs will be added just to attach
+   location info to it.  Don't run the test in that case.  The torture
+   framework always appears to run the testcase without -O option
+   first.  */
+
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
+
 #include <stdio.h>
 
 void hp1(void)
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-10.c b/gcc/testsuite/gcc.target/s390/hotpatch-10.c
index 2308d3331a0..21d499e6204 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-10.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-10.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=0,0" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-11.c b/gcc/testsuite/gcc.target/s390/hotpatch-11.c
index 56b3596d497..a37f3117c64 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-11.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-11.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=1,0" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-12.c b/gcc/testsuite/gcc.target/s390/hotpatch-12.c
index 8a91c1b8b06..cb8d1521bfa 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-12.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-12.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=999,0" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-13.c b/gcc/testsuite/gcc.target/s390/hotpatch-13.c
index 70fab74d18d..fb037c2040f 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-13.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-13.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-14.c b/gcc/testsuite/gcc.target/s390/hotpatch-14.c
index 389bf42aee8..fd0368a55ae 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-14.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-14.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-15.c b/gcc/testsuite/gcc.target/s390/hotpatch-15.c
index 0b10fb18b41..a1c3e7c694b 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-15.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-15.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-16.c b/gcc/testsuite/gcc.target/s390/hotpatch-16.c
index 2fcdf1ce765..737c3a1c071 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-16.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-16.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=0,0" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-17.c b/gcc/testsuite/gcc.target/s390/hotpatch-17.c
index 299f82505ee..6d8c40c65c0 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-17.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-17.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=1,2" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-18.c b/gcc/testsuite/gcc.target/s390/hotpatch-18.c
index fd44d118323..02807ff7b6e 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-18.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-18.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=1,2 -mhotpatch=0,0" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-19.c b/gcc/testsuite/gcc.target/s390/hotpatch-19.c
index 899e000a71f..71c2ed13d18 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-19.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-19.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=1,2" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-2.c b/gcc/testsuite/gcc.target/s390/hotpatch-2.c
index 99fe9114f24..ece6cb37e57 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-2.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-2.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=0,1" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-3.c b/gcc/testsuite/gcc.target/s390/hotpatch-3.c
index 20f43c6b458..65ebe353688 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-3.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-3.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=0,2" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-4.c b/gcc/testsuite/gcc.target/s390/hotpatch-4.c
index 32a3c032d65..d0956f14240 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-4.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-4.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=0,3" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-5.c b/gcc/testsuite/gcc.target/s390/hotpatch-5.c
index 72ee5a30056..64d49eecb13 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-5.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-5.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=0,4" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-6.c b/gcc/testsuite/gcc.target/s390/hotpatch-6.c
index 1e1d0e6973a..e6753c8385d 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-6.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-6.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=0,5" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-7.c b/gcc/testsuite/gcc.target/s390/hotpatch-7.c
index 3f60e61e7e2..3f1c9f0e294 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-7.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-7.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile } */
 /* { dg-options "-mzarch -mhotpatch=0,6" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-8.c b/gcc/testsuite/gcc.target/s390/hotpatch-8.c
index 012a4ebd44d..a2fb83f2977 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-8.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-8.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile { target { ! lp64 } } } */
 /* { dg-options "-mesa -march=g5 -Wno-deprecated -mhotpatch=0,3" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/hotpatch-9.c b/gcc/testsuite/gcc.target/s390/hotpatch-9.c
index b7d557e43a2..34fae55d3ad 100644
--- a/gcc/testsuite/gcc.target/s390/hotpatch-9.c
+++ b/gcc/testsuite/gcc.target/s390/hotpatch-9.c
@@ -2,6 +2,7 @@
 
 /* { dg-do compile { target { ! lp64 } } } */
 /* { dg-options "-mesa -march=g5 -Wno-deprecated -mhotpatch=0,4" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O*" } } */
 
 #include <stdio.h>
 
diff --git a/gcc/testsuite/gcc.target/s390/s390.exp b/gcc/testsuite/gcc.target/s390/s390.exp
index 420aff19a3f..8489a51693b 100644
--- a/gcc/testsuite/gcc.target/s390/s390.exp
+++ b/gcc/testsuite/gcc.target/s390/s390.exp
@@ -220,7 +220,7 @@ dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/md/*.{c,S,C}]] \
 
 # Additional hotpatch torture tests.
 torture-init
-set-torture-options [list -Os -O0 -O1 -O2 -O3]
+set-torture-options [list -Os -O1 -O2 -O3]
 gcc-dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/hotpatch-\[0-9\]*.c]] \
 	"" $DEFAULT_CFLAGS
 torture-finish
-- 
2.33.1

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