[gcc/devel/omp/gcc-16] GCN: Implement 'TARGET_ADDR_SPACE_ZERO_ADDRESS_VALID' [PR101484]

https://gcc.gnu.org/g:e9ee0bf52c700c68fe94f0906e0909b257907415

commit e9ee0bf52c700c68fe94f0906e0909b257907415
Author: Thomas Schwinge <[email protected]>
Date:   Thu Jun 11 21:41:10 2026 +0200

    GCN: Implement 'TARGET_ADDR_SPACE_ZERO_ADDRESS_VALID' [PR101484]
    
    This is the proper fix to replace
    commit 9f2bc5077debef2b046b6c10d38591ac324ad8b5
    "[gcn] Work-around libgomp 'error: array subscript 0 is outside array bounds of ‘__lds struct gomp_thread * __lds[0]’ [-Werror=array-bounds]' [PR101484]",
    commit 8168338684fc2bed576bb09202c63b3e9e678d92
    "[gcn] Work-around libgomp 'error: array subscript 0 is outside array bounds of ‘__lds struct gomp_thread * __lds[0]’ [-Werror=array-bounds]' some more [PR101484]".
    
            PR target/101484
            gcc/
            * config/gcn/gcn.cc (TARGET_ADDR_SPACE_ZERO_ADDRESS_VALID): Implement.
            libgomp/
            * configure.tgt [GCN] (XCFLAGS): Don't add '-Wno-error=array-bounds'.
    
    (cherry picked from commit 9e2d90074db033be5544d97f03c7d80e5623af25)

Diff:
---
 gcc/config/gcn/gcn.cc | 10 ++++++++++
 libgomp/configure.tgt |  3 ---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/gcc/config/gcn/gcn.cc b/gcc/config/gcn/gcn.cc
index 4ba767c6951c..9e7907cfaf35 100644
--- a/gcc/config/gcn/gcn.cc
+++ b/gcc/config/gcn/gcn.cc
@@ -1874,6 +1874,14 @@ gcn_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
   return false;
 }
 
+static bool
+gcn_addr_space_zero_address_valid (addr_space_t as)
+{
+  if (as == ADDR_SPACE_LDS)
+    return true;
+  return false;
+}
+
 static addr_space_t
 gcn_addr_space_resolve_default (addr_space_t as)
 {
@@ -8085,6 +8093,8 @@ gcn_dwarf_register_span (rtx rtl)
 #define TARGET_ADDR_SPACE_POINTER_MODE gcn_addr_space_pointer_mode
 #undef  TARGET_ADDR_SPACE_SUBSET_P
 #define TARGET_ADDR_SPACE_SUBSET_P gcn_addr_space_subset_p
+#undef  TARGET_ADDR_SPACE_ZERO_ADDRESS_VALID
+#define TARGET_ADDR_SPACE_ZERO_ADDRESS_VALID gcn_addr_space_zero_address_valid
 #undef  TARGET_ADDR_SPACE_CONVERT
 #define TARGET_ADDR_SPACE_CONVERT gcn_addr_space_convert
 #undef  TARGET_ARG_PARTIAL_BYTES
diff --git a/libgomp/configure.tgt b/libgomp/configure.tgt
index 46af75f978f8..a74e966fdfde 100644
--- a/libgomp/configure.tgt
+++ b/libgomp/configure.tgt
@@ -181,9 +181,6 @@ case "${target}" in
 
   amdgcn*-*-*)
 	config_path="gcn accel"
-
-	#TODO PR101484
-	XCFLAGS="$XCFLAGS -Wno-error=array-bounds"
 	;;
 
   *)