From: "H.J. Lu" <hjl.tools@gmail.com>
To: gcc-patches@gcc.gnu.org
Subject: [PATCH] i386: Disallow sibcall when calling ifunc functions with PIC register
Date: Tue, 14 Jun 2022 12:25:48 -0700 [thread overview]
Message-ID: <20220614192548.1929268-1-hjl.tools@gmail.com> (raw)
Disallow siball when calling ifunc functions with PIC register so that
PIC register can be restored.
gcc/
PR target/105960
* config/i386/i386.cc (ix86_function_ok_for_sibcall): Return
false if PIC register is used when calling ifunc functions.
gcc/testsuite/
PR target/105960
* gcc.target/i386/pr105960.c: New test.
---
gcc/config/i386/i386.cc | 9 +++++++++
gcc/testsuite/gcc.target/i386/pr105960.c | 19 +++++++++++++++++++
2 files changed, 28 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/i386/pr105960.c
diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 3d189e124e4..1ca7836e11e 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -1015,6 +1015,15 @@ ix86_function_ok_for_sibcall (tree decl, tree exp)
}
}
+ if (decl && ix86_use_pseudo_pic_reg ())
+ {
+ /* When PIC register is used, it must be restored after ifunc
+ function returns. */
+ cgraph_node *node = cgraph_node::get (decl);
+ if (node && node->ifunc_resolver)
+ return false;
+ }
+
/* Otherwise okay. That also includes certain types of indirect calls. */
return true;
}
diff --git a/gcc/testsuite/gcc.target/i386/pr105960.c b/gcc/testsuite/gcc.target/i386/pr105960.c
new file mode 100644
index 00000000000..db137a1642d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr105960.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-require-ifunc "" } */
+/* { dg-options "-O2 -fpic" } */
+
+__attribute__((target_clones("default","fma")))
+static inline double
+expfull_ref(double x)
+{
+ return __builtin_pow(x, 0.1234);
+}
+
+double
+exp_ref(double x)
+{
+ return expfull_ref(x);
+}
+
+/* { dg-final { scan-assembler "jmp\[ \t\]*expfull_ref@PLT" { target { ! ia32 } } } } */
+/* { dg-final { scan-assembler "call\[ \t\]*expfull_ref@PLT" { target ia32 } } } */
--
2.36.1
next reply other threads:[~2022-06-14 19:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-14 19:25 H.J. Lu [this message]
2022-06-20 14:02 ` PING^1 " H.J. Lu
2022-06-20 14:51 ` Uros Bizjak
2022-06-21 14:45 ` H.J. Lu
2022-06-21 14:53 ` Uros Bizjak
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