Hi!
On the following testcase with -fpic -mcmodel=large -fno-plt we emit
call puts@GOTPCREL(%rip)
but that is not really appropriate for CM_LARGE_PIC, the .text can be larger
than 2GB in that case and the .got slot further away from %rip than what can
fit into the signed 32-bit immediate.
The following patch computes the address of the .got slot the way it is
computed for that model for function pointer loads, and calls that.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2020-12-01 Jakub Jelinek <ja...@redhat.com>
PR target/98063
* config/i386/i386-expand.c (ix86_expand_call): Handle non-plt
CM_LARGE_PIC calls.
* gcc.target/i386/pr98063.c: New test.
--- gcc/config/i386/i386-expand.c.jj 2020-11-26 16:22:29.091353066 +0100
+++ gcc/config/i386/i386-expand.c 2020-11-30 12:55:52.936300739 +0100
@@ -8063,7 +8063,17 @@ ix86_expand_call (rtx retval, rtx fnaddr
}
else if (!TARGET_PECOFF && !TARGET_MACHO)
{
- if (TARGET_64BIT)
+ if (TARGET_64BIT
+ && ix86_cmodel == CM_LARGE_PIC
+ && DEFAULT_ABI != MS_ABI)
+ {
+ fnaddr = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, addr),
+ UNSPEC_GOT);
+ fnaddr = gen_rtx_CONST (Pmode, fnaddr);
+ fnaddr = force_reg (Pmode, fnaddr);
+ fnaddr = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, fnaddr);
+ }
+ else if (TARGET_64BIT)
{
fnaddr = gen_rtx_UNSPEC (Pmode,
gen_rtvec (1, addr),
--- gcc/testsuite/gcc.target/i386/pr98063.c.jj 2020-11-30 13:00:31.699214198
+0100
+++ gcc/testsuite/gcc.target/i386/pr98063.c 2020-11-30 13:24:05.352485291
+0100
@@ -0,0 +1,13 @@
+/* PR target/98063 */
+/* { dg-do run { target { i?86-*-linux* x86_64-*-linux* } } } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-require-effective-target fpic } */
+/* { dg-options "-O2 -fpic -mcmodel=large -fno-plt -save-temps" } */
+/* { dg-final { scan-assembler-not "puts@GOTPCREL" } } */
+
+int
+main ()
+{
+ __builtin_puts ("Hello, world!");
+ return 0;
+}
Jakub
