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i386: Disallow sibcall for calling ifunc functions with PIC register

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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.

(cherry picked from commit fe9765c0b9)
This commit is contained in:
H.J. Lu 2022-06-14 08:20:16 -07:00
parent 00b26ae2d1
commit 2474c8e09a
2 changed files with 28 additions and 0 deletions
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9
gcc/config/i386/i386.cc
View File

@ -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;
}

19
gcc/testsuite/gcc.target/i386/pr105960.c Normal file
View File

@ -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 } } } */