8.3.0: backport PR91269 (sparc subreg regression)

Bug: https://gcc.gnu.org/PR91269
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

2 files changed, 106 insertions, 0 deletions

diff --git a/8.3.0/gentoo/31_all_sparc-fpu-subregs-91269.patch b/8.3.0/gentoo/31_all_sparc-fpu-subregs-91269.patch
new file mode 100644
index 0000000..e21d07d
--- /dev/null
+++ b/8.3.0/gentoo/31_all_sparc-fpu-subregs-91269.patch
@@ -0,0 +1,105 @@
+https://gcc.gnu.org/PR91269
+
+From bebaf06774baca584c7e9f8410d0e49606a11d60 Mon Sep 17 00:00:00 2001
+From: ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Fri, 20 Sep 2019 09:42:40 +0000
+Subject: [PATCH] 	PR target/91269 	* config/sparc/sparc.h
+ (HARD_REGNO_CALLER_SAVE_MODE): Define.
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@275994 138bc75d-0d04-0410-961f-82ee72b054a4
+---
+ gcc/config/sparc/sparc.h       |  7 ++++
+ gcc/testsuite/gcc.dg/pr91269.c | 70 ++++++++++++++++++++++++++++++++++
+
+--- a/gcc/config/sparc/sparc.h
++++ b/gcc/config/sparc/sparc.h
+@@ -711,6 +711,13 @@ along with GCC; see the file COPYING3.  If not see
+    register window instruction in the prologue.  */
+ #define HARD_REGNO_RENAME_OK(FROM, TO) ((FROM) != 1)
+ 
++/* Select a register mode required for caller save of hard regno REGNO.
++   Contrary to what is documented, the default is not the smallest suitable
++   mode but the largest suitable mode for the given (REGNO, NREGS) pair and
++   it quickly creates paradoxical subregs that can be problematic.  */
++#define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
++  ((MODE) == VOIDmode ? choose_hard_reg_mode (REGNO, NREGS, false) : (MODE))
++
+ /* Specify the registers used for certain standard purposes.
+    The values of these macros are register numbers.  */
+ 
+--- /dev/null
++++ b/gcc/testsuite/gcc.dg/pr91269.c
+@@ -0,0 +1,70 @@
++/* PR target/91269 */
++/* Testcase by Sergei Trofimovich <slyfox@inbox.ru> */
++
++/* { dg-do assemble } */
++/* { dg-options "-O2 -Wno-int-conversion" }  */
++/* { dg-additional-options "-fcall-used-g6 -fPIE -mcpu=niagara4" { target sparc*-*-* } } */
++
++struct m;
++
++enum { a = 2 };
++int b[1];
++int d[2715];
++int e, f, h;
++enum { i = 2 } j;
++inline int c(int k) {
++  char *cp;
++  if (k >= 62 && k <= 247)
++    cp = b[k];
++  if (cp)
++    return 65533;
++  return 2;
++}
++inline int g(int k) {
++  if (k < sizeof(d))
++    return e;
++  return 0;
++}
++
++int u(struct m*, char*, char*);
++
++int l(struct m *k, char n, long o, int *p) {
++  int q, flags = j, r, s, lasttwo = *p;
++  char inptr, outptr;
++  while (inptr) {
++    if (__builtin_expect(h, 0))
++      break;
++    unsigned ch = inptr;
++    if (lasttwo) {
++      long need = lasttwo >> 3;
++      if (__builtin_expect(need > n, 0))
++        break;
++    } else if (s == i) {
++      long t = c(ch);
++      if (t != 65533) {
++        int jch = g(ch);
++        if (jch & 8)
++          continue;
++      }
++    }
++    if (ch <= 5)
++      ;
++    else {
++      long t = c(ch);
++      if (t != 65533)
++        ;
++      else {
++        switch (f >> 8)
++        case 79:
++          q = f == 20308 || f == 20350;
++        if (q)
++          if (j)
++            r = u(k, &inptr, &outptr);
++        s = *p;
++        if (r)
++          if (o && flags & a)
++            break;
++      }
++    }
++  }
++}
+-- 
+2.23.0
+
diff --git a/8.3.0/gentoo/README.history b/8.3.0/gentoo/README.history
index 68b1fd8..3400182 100644
--- a/8.3.0/gentoo/README.history
+++ b/8.3.0/gentoo/README.history
@@ -1,6 +1,7 @@
 1.2		TODO
 	+ 29_all_ia64-bootstrap.patch
 	+ 30_all_sparc-PIC-constant-PR91472.patch
+	+ 31_all_sparc-fpu-subregs-91269.patch
 
 1.1		06 Apr 2019
 	+ 26_all_overridable_native.patch