From: Andi Kleen <ak@gcc.gnu.org>
Date: Wed, 13 May 2026 23:40:16 +0000 (-0700)
Subject: PR124316: Fix ptwrite assembler mode
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=33844d9e51258ea3dfe2c24448e5e00ed4d0762e;p=thirdparty%2Fgcc.git

PR124316: Fix ptwrite assembler mode

Add explicit assembler mode for cases when the argument is not
unambigious. This avoids cases where a user specified 64bit ptwrite
ends up being 32bit due to an ambigious argument.

	PR target/124316

gcc/ChangeLog:

	* config/i386/i386.md (ptwrite): Add explicit mode to
	instruction.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr124316.c: New test.
---

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index a486ea3d79d..fa84da26aa8 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -30303,7 +30303,7 @@
   [(unspec_volatile [(match_operand:SWI48 0 "nonimmediate_operand" "rm")]
 		    UNSPECV_PTWRITE)]
   "TARGET_PTWRITE"
-  "ptwrite\t%0"
+  "ptwrite<imodesuffix>\t%0"
   [(set_attr "type" "other")
    (set_attr "prefix_0f" "1")
    (set_attr "prefix_rep" "1")])
diff --git a/gcc/testsuite/gcc.target/i386/pr124316.c b/gcc/testsuite/gcc.target/i386/pr124316.c
new file mode 100644
index 00000000000..c1959611a92
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr124316.c
@@ -0,0 +1,14 @@
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-mptwrite" } */
+#include <x86gprintrin.h>
+
+unsigned long long ull;
+unsigned u;
+void foo()
+{
+    _ptwrite64(ull);
+    _ptwrite32(u);
+}
+
+/* { dg-final { scan-assembler-times "ptwritel" 1 } } */
+/* { dg-final { scan-assembler-times "ptwriteq" 1 } } */