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From: Uros Bizjak <uros@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-7037] i386: Do not use %ecx DRAP for functions that use __builtin_eh_return [PR104362] Date: Thu, 3 Feb 2022 21:25:36 +0000 (GMT) [thread overview] Message-ID: <20220203212536.2D14E3858D37@sourceware.org> (raw) https://gcc.gnu.org/g:599122fa690d55e5e14d74f4d514b2d8b6a98505 commit r12-7037-g599122fa690d55e5e14d74f4d514b2d8b6a98505 Author: Uros Bizjak <ubizjak@gmail.com> Date: Thu Feb 3 22:24:21 2022 +0100 i386: Do not use %ecx DRAP for functions that use __builtin_eh_return [PR104362] %ecx can't be used for both DRAP register and eh_return. Adjust find_drap_reg to choose %edi for functions that uses __builtin_eh_return to avoid the assert in ix86_expand_epilogue that enforces this rule. 2022-02-03 Uroš Bizjak <ubizjak@gmail.com> gcc/ChangeLog: PR target/104362 * config/i386/i386.cc (find_drap_reg): For 32bit targets return DI_REG if function uses __builtin_eh_return. gcc/testsuite/ChangeLog: PR target/104362 * gcc.target/i386/pr104362.c: New test. Diff: --- gcc/config/i386/i386.cc | 3 ++- gcc/testsuite/gcc.target/i386/pr104362.c | 24 ++++++++++++++++++++++++ 2 files changed, 26 insertions(+), 1 deletion(-) diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc index ad5a5caa413..dd5584fb8ed 100644 --- a/gcc/config/i386/i386.cc +++ b/gcc/config/i386/i386.cc @@ -7400,7 +7400,8 @@ find_drap_reg (void) register in such case. */ if (DECL_STATIC_CHAIN (decl) || cfun->machine->no_caller_saved_registers - || crtl->tail_call_emit) + || crtl->tail_call_emit + || crtl->calls_eh_return) return DI_REG; /* Reuse static chain register if it isn't used for parameter diff --git a/gcc/testsuite/gcc.target/i386/pr104362.c b/gcc/testsuite/gcc.target/i386/pr104362.c new file mode 100644 index 00000000000..5e5422e2679 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr104362.c @@ -0,0 +1,24 @@ +/* PR target/104362 */ +/* { dg-do compile } */ +/* { dg-options "-mavx512f" } */ + +struct _Unwind_Context +{ + void *ra; + char array[48]; +}; + +extern long uw_install_context_1 (struct _Unwind_Context *); + +void +_Unwind_RaiseException (void) +{ + struct _Unwind_Context this_context, cur_context; + __builtin_memset(&this_context, 55, sizeof(this_context)); + long offset = uw_install_context_1 (&this_context); + __builtin_memcpy (&this_context, &cur_context, + sizeof (struct _Unwind_Context)); + void *handler = __builtin_frob_return_addr ((&cur_context)->ra); + uw_install_context_1 (&cur_context); + __builtin_eh_return (offset, handler); +}
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