From: Richard Biener <rguenther@suse.de>
Date: Thu, 4 Jun 2020 15:26:36 +0000 (+0100)
Subject: aarch64: PR target/95526: Fix gimplification of varargs
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ab56390384cd5168b548ff07e6f0c9c4d41420fb;p=gcc.git

aarch64: PR target/95526: Fix gimplification of varargs

This patch fixes a latent bug exposed by
eb72dc663e9070b281be83a80f6f838a3a878822 in the aarch64 backend that was
causing wrong codegen and several testsuite failures. See the discussion
on the bug for details.

Bootstrapped and regtested on aarch64-linux-gnu. Cleaned up several
failing tests and no new fails introduced.

2020-06-04  Richard Biener  <rguenther@suse.de>

gcc/:

	* config/aarch64/aarch64.c (aarch64_gimplify_va_arg_expr):
	Ensure that tmp_ha is marked TREE_ADDRESSABLE.
---

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 6352d4ff78a..97da6076239 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -16370,6 +16370,7 @@ aarch64_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
 	}
 
       /* *(field_ptr_t)&ha = *((field_ptr_t)vr_saved_area  */
+      TREE_ADDRESSABLE (tmp_ha) = 1;
       tmp_ha = build1 (ADDR_EXPR, field_ptr_t, tmp_ha);
       addr = t;
       t = fold_convert (field_ptr_t, addr);