* [committed] i386: Fix ICE with -fsplit-stack -mcmodel=large [PR112686]
@ 2023-11-24 16:33 Uros Bizjak
0 siblings, 0 replies; 2+ messages in thread
From: Uros Bizjak @ 2023-11-24 16:33 UTC (permalink / raw)
To: gcc-patches
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For -mcmodel=large, we have to load function address to a register.
PR target/112686
gcc/ChangeLog:
* config/i386/i386.cc (ix86_expand_split_stack_prologue): Load
function address to a register for ix86_cmodel == CM_LARGE.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr112686.c: New test.
Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.
Uros.
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diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 7b922857d80..9390f525b99 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -10481,6 +10481,8 @@ ix86_expand_split_stack_prologue (void)
SYMBOL_REF_FLAGS (split_stack_fn_large) |= SYMBOL_FLAG_LOCAL;
}
+ fn = split_stack_fn_large;
+
if (ix86_cmodel == CM_LARGE_PIC)
{
rtx_code_label *label;
@@ -10494,16 +10496,15 @@ ix86_expand_split_stack_prologue (void)
emit_insn (gen_set_rip_rex64 (reg10, label));
emit_insn (gen_set_got_offset_rex64 (reg11, label));
emit_insn (gen_add2_insn (reg10, reg11));
- x = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, split_stack_fn_large),
- UNSPEC_GOT);
+ x = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, fn), UNSPEC_GOT);
x = gen_rtx_CONST (Pmode, x);
emit_move_insn (reg11, x);
x = gen_rtx_PLUS (Pmode, reg10, reg11);
x = gen_const_mem (Pmode, x);
fn = copy_to_suggested_reg (x, reg11, Pmode);
}
- else
- fn = split_stack_fn_large;
+ else if (ix86_cmodel == CM_LARGE)
+ fn = copy_to_suggested_reg (fn, reg11, Pmode);
/* When using the large model we need to load the address
into a register, and we've run out of registers. So we
diff --git a/gcc/testsuite/gcc.target/i386/pr112686.c b/gcc/testsuite/gcc.target/i386/pr112686.c
new file mode 100644
index 00000000000..858e91ba727
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr112686.c
@@ -0,0 +1,5 @@
+/* PR target/112686 */
+/* { dg-do compile { target lp64 } } */
+/* { dg-options "-fsplit-stack -mcmodel=large" } */
+
+void foo (void) {}
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [committed] i386: Fix ICE with -fsplit-stack -mcmodel=large [PR112686]
@ 2023-11-26 10:51 FX Coudert
0 siblings, 0 replies; 2+ messages in thread
From: FX Coudert @ 2023-11-26 10:51 UTC (permalink / raw)
To: ubizjak; +Cc: GCC Patches
Hi Uros,
The new test at gcc.target/i386/pr112686.c fails on darwin with:
Excess errors:
cc1: error: '-fsplit-stack' currently only supported on GNU/Linux
cc1: error: '-fsplit-stack' is not supported by this compiler configuration
It needs an /* { dg-require-effective-target split_stack } */
which I have added and pushed as https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=c54ee4fc1667593081ce80030eeb70838267ad96
FX
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2023-11-24 16:33 [committed] i386: Fix ICE with -fsplit-stack -mcmodel=large [PR112686] Uros Bizjak
2023-11-26 10:51 FX Coudert
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