[gcc r11-9161] gcc/configure.ac: fix register issue for global_load assembler functions

[gcc r11-9161] gcc/configure.ac: fix register issue for global_load assembler functions

[Tobias Burnus]

https://gcc.gnu.org/g:e85d6ef1c450e2bed905461e2c744d816e8c4bff

commit r11-9161-ge85d6ef1c450e2bed905461e2c744d816e8c4bff
Author: Marcel Vollweiler <marcel@codesourcery.com>
Date:   Fri Jun 18 04:50:36 2021 -0700

    gcc/configure.ac: fix register issue for global_load assembler functions
    
    gcc/ChangeLog:
    
            * config.in: Regenerate.
            * config/gcn/gcn.c (print_operand_address): Fix for global_load assembler
            functions.
            * configure: Regenerate.
            * configure.ac: Fix for global_load assembler functions.
    
    (cherry picked from commit cfa1f8226f275447015e2cb3fb0d876133e6509b)

Diff:
---
 gcc/config.in        |  6 ++++++
 gcc/config/gcn/gcn.c | 17 +++++++++++++----
 gcc/configure        | 27 +++++++++++++++++++++++++++
 gcc/configure.ac     | 22 ++++++++++++++++++++++
 4 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/gcc/config.in b/gcc/config.in
index 4d5da7dab3a..69248fdcfaa 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -1438,6 +1438,12 @@
 #endif
 
 
+/* Define if your assembler has fixed global_load functions. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_GCN_ASM_GLOBAL_LOAD_FIXED
+#endif
+
+
 /* Define to 1 if you have the `getchar_unlocked' function. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_GETCHAR_UNLOCKED
diff --git a/gcc/config/gcn/gcn.c b/gcc/config/gcn/gcn.c
index 9660ca6eaa4..3453cb70d3c 100644
--- a/gcc/config/gcn/gcn.c
+++ b/gcc/config/gcn/gcn.c
@@ -5481,13 +5481,22 @@ print_operand_address (FILE *file, rtx mem)
 	      if (vgpr_offset == NULL_RTX)
 		/* In this case, the vector offset is zero, so we use the first
 		   lane of v1, which is initialized to zero.  */
-		fprintf (file, "v[1:2]");
+		{
+		  if (HAVE_GCN_ASM_GLOBAL_LOAD_FIXED)
+		    fprintf (file, "v1");
+		  else
+		    fprintf (file, "v[1:2]");
+		}
 	      else if (REG_P (vgpr_offset)
 		       && VGPR_REGNO_P (REGNO (vgpr_offset)))
 		{
-		  fprintf (file, "v[%d:%d]",
-			   REGNO (vgpr_offset) - FIRST_VGPR_REG,
-			   REGNO (vgpr_offset) - FIRST_VGPR_REG + 1);
+		  if (HAVE_GCN_ASM_GLOBAL_LOAD_FIXED)
+		    fprintf (file, "v%d",
+			     REGNO (vgpr_offset) - FIRST_VGPR_REG);
+		  else
+		    fprintf (file, "v[%d:%d]",
+			     REGNO (vgpr_offset) - FIRST_VGPR_REG,
+			     REGNO (vgpr_offset) - FIRST_VGPR_REG + 1);
 		}
 	      else
 		output_operand_lossage ("bad ADDR_SPACE_GLOBAL address");
diff --git a/gcc/configure b/gcc/configure
index e84ec2e4a62..b1ae767629b 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -28891,6 +28891,33 @@ case "$target" in
     ;;
 esac
 
+# This tests if the assembler supports two registers for global_load functions
+# (like in LLVM versions <12) or one register (like in LLVM 12).
+case "$target" in
+  amdgcn-* | gcn-*)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler fix for global_load functions" >&5
+$as_echo_n "checking assembler fix for global_load functions... " >&6; }
+    gcc_cv_as_gcn_global_load_fixed=yes
+    if test x$gcc_cv_as != x; then
+      cat > conftest.s <<EOF
+	global_store_dwordx2    v[1:2], v[4:5], s[14:15]
+EOF
+      if $gcc_cv_as -triple=amdgcn--amdhsa -filetype=obj -mcpu=gfx900 -o conftest.o conftest.s > /dev/null 2>&1; then
+        gcc_cv_as_gcn_global_load_fixed=no
+      fi
+      rm -f conftest.s conftest.o conftest
+    fi
+    global_load_fixed=`if test x$gcc_cv_as_gcn_global_load_fixed = xyes; then echo 1; else echo 0; fi`
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_GCN_ASM_GLOBAL_LOAD_FIXED $global_load_fixed
+_ACEOF
+
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_gcn_global_load_fixed" >&5
+$as_echo "$gcc_cv_as_gcn_global_load_fixed" >&6; }
+    ;;
+esac
+
 # ??? Not all targets support dwarf2 debug_line, even within a version
 # of gas.  Moreover, we need to emit a valid instruction to trigger any
 # info to the output file.  So, as supported targets are added to gas 2.11,
diff --git a/gcc/configure.ac b/gcc/configure.ac
index bd37d47f4a1..428f136d3ba 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -5348,6 +5348,28 @@ case "$target" in
     ;;
 esac
 
+# This tests if the assembler supports two registers for global_load functions
+# (like in LLVM versions <12) or one register (like in LLVM 12).
+case "$target" in
+  amdgcn-* | gcn-*)
+    AC_MSG_CHECKING(assembler fix for global_load functions)
+    gcc_cv_as_gcn_global_load_fixed=yes
+    if test x$gcc_cv_as != x; then
+      cat > conftest.s <<EOF
+	global_store_dwordx2    v[[1:2]], v[[4:5]], s[[14:15]]
+EOF
+      if $gcc_cv_as -triple=amdgcn--amdhsa -filetype=obj -mcpu=gfx900 -o conftest.o conftest.s > /dev/null 2>&1; then
+        gcc_cv_as_gcn_global_load_fixed=no
+      fi
+      rm -f conftest.s conftest.o conftest
+    fi
+    global_load_fixed=`if test x$gcc_cv_as_gcn_global_load_fixed = xyes; then echo 1; else echo 0; fi`
+    AC_DEFINE_UNQUOTED(HAVE_GCN_ASM_GLOBAL_LOAD_FIXED, $global_load_fixed,
+      [Define if your assembler has fixed global_load functions.])
+    AC_MSG_RESULT($gcc_cv_as_gcn_global_load_fixed)
+    ;;
+esac
+
 # ??? Not all targets support dwarf2 debug_line, even within a version
 # of gas.  Moreover, we need to emit a valid instruction to trigger any
 # info to the output file.  So, as supported targets are added to gas 2.11,