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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n DB5PEPF00014B9F.eurprd02.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"In the INACTIVE_CALLER -> INACTIVE LOCAL transition, ensure ZA is active\nand zeroed before setting tpidr2_el0.\n\ngcc/ChangeLog:\n\n\tPR target/119210\n\t* config/aarch64/aarch64.cc (aarch64_mode_emit_local_sme_state):\n\tAdd PSTATE.ZA enablement, and zero it if already enabled.\n\ngcc/testsuite/ChangeLog:\n\n\tPR target/119210\n\t* gcc.target/aarch64/sme/za_state_8.c: New test.","diff":"diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc\nindex 62194b96450840d3bae69636fb04f3d62e516c8d..693ce8b4d25cd8cef03e415ea1c033cb9311cb21 100644\n--- a/gcc/config/aarch64/aarch64.cc\n+++ b/gcc/config/aarch64/aarch64.cc\n@@ -31951,7 +31951,8 @@ aarch64_mode_emit_local_sme_state (aarch64_local_sme_state mode,\n emit_insn (gen_aarch64_tpidr2_save ());\n emit_insn (gen_aarch64_clear_tpidr2 ());\n if (mode == aarch64_local_sme_state::ACTIVE_LIVE\n-\t || mode == aarch64_local_sme_state::ACTIVE_DEAD)\n+\t || mode == aarch64_local_sme_state::ACTIVE_DEAD\n+\t || mode == aarch64_local_sme_state::INACTIVE_LOCAL)\n \t{\n \t if (aarch64_cfun_has_state (\"za\"))\n \t emit_insn (gen_aarch64_initial_zero_za ());\n@@ -32033,6 +32034,16 @@ aarch64_mode_emit_local_sme_state (aarch64_local_sme_state mode,\n \n if (mode == aarch64_local_sme_state::INACTIVE_LOCAL)\n {\n+ if (prev_mode == aarch64_local_sme_state::INACTIVE_CALLER)\n+\t/* Enable ZA (if it wasn't already enabled on entry). Enabling ZA has\n+\t the side-effect of zeroing ZA.\n+\n+\t A functionally correct alternative would be to leave TPIDR2_EL0 null\n+\t and zero the save buffer. However, zeroing the save buffer would require\n+\t more code and would optimize for the case in which a callee also\n+\t initialises private ZA state (which should be a rare event). */\n+\temit_insn (gen_aarch64_smstart_za ());\n+\n if (prev_mode == aarch64_local_sme_state::ACTIVE_LIVE\n \t || prev_mode == aarch64_local_sme_state::ACTIVE_DEAD\n \t || prev_mode == aarch64_local_sme_state::INACTIVE_CALLER)\ndiff --git a/gcc/testsuite/gcc.target/aarch64/sme/za_state_8.c b/gcc/testsuite/gcc.target/aarch64/sme/za_state_8.c\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..9b7a6ffa69cbce1969d40f9d69a76522c0e439c5\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/sme/za_state_8.c\n@@ -0,0 +1,25 @@\n+// { dg-options \"-O -fomit-frame-pointer -fno-optimize-sibling-calls\" }\n+// { dg-final { check-function-bodies \"**\" \"\" } }\n+\n+#include \n+\n+void callee_ns();\n+__arm_streaming __arm_inout(\"za\") void callee_s();\n+\n+/*\n+** foo:\n+**\t...\n+**\tsmstart\tza\n+**\t...\n+**\tmsr\ttpidr2_el0, x\\d+\n+**\t...\n+*/\n+__arm_locally_streaming __arm_new(\"za\") const float * foo(const float* x) {\n+ callee_ns ();\n+ const float32_t *x_f_in = x;\n+ svzero_za();\n+ callee_s ();\n+ return x_f_in;\n+}\n+\n+\n","prefixes":["v2","2/6"]}