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(localhost [IPv6:::1]) by gnu-tgl-3.localdomain (Postfix) with ESMTP id E0021C0093; Sat, 5 Mar 2022 06:28:07 -0800 (PST) To: gcc-patches@gcc.gnu.org Subject: [PATCH] x86: Disable SSE on unwind-c.c and unwind-dw2.c Date: Sat, 5 Mar 2022 06:28:07 -0800 Message-Id: <20220305142807.175581-1-hjl.tools@gmail.com> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-Spam-Status: No, score=-3029.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: "H.J. Lu via Gcc-patches" From: "H.J. Lu" Reply-To: "H.J. Lu" Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org Sender: "Gcc-patches" Since eh_return doesn't work with stack realignment, disable SSE on unwind-c.c and unwind-dw2.c to avoid stack realignment with the 4-byte incoming stack to avoid SSE usage which is caused by commit 609e8c492d62d92465460eae3d43dfc4b2c68288 Author: H.J. Lu Date: Sat Feb 26 14:17:23 2022 -0800 x86: Always return pseudo register in ix86_gen_scratch_sse_rtx when pseudo vector registers are used to expand memset. gcc/ PR target/104781 * config/i386/i386.cc (ix86_expand_epilogue): Assert there is no stack realignment for eh_return. gcc/testsuite/ * gcc.target/i386/eh_return-1.c: Add -mincoming-stack-boundary=4. * gcc.target/i386/eh_return-2.c: Likewise. libgcc/ PR target/104781 * config.host (tmake_file): Add i386/32/t-eh-return-no-sse for 32-bit x86 Cygwin and Solaris. * config/i386/32/t-eh-return-no-sse: New file. --- gcc/config/i386/i386.cc | 5 ++--- gcc/testsuite/gcc.target/i386/eh_return-1.c | 2 +- gcc/testsuite/gcc.target/i386/eh_return-2.c | 2 +- libgcc/config.host | 13 +++++++++++++ libgcc/config/i386/32/t-eh-return-no-sse | 5 +++++ 5 files changed, 22 insertions(+), 5 deletions(-) create mode 100644 libgcc/config/i386/32/t-eh-return-no-sse diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc index 95219902694..1c675304e32 100644 --- a/gcc/config/i386/i386.cc +++ b/gcc/config/i386/i386.cc @@ -9444,9 +9444,8 @@ ix86_expand_epilogue (int style) rtx sa = EH_RETURN_STACKADJ_RTX; rtx_insn *insn; - /* %ecx can't be used for both DRAP register and eh_return. */ - if (crtl->drap_reg) - gcc_assert (REGNO (crtl->drap_reg) != CX_REG); + /* Stack realignment doesn't work with eh_return. */ + gcc_assert (!crtl->stack_realign_needed); /* regparm nested functions don't work with eh_return. */ gcc_assert (!ix86_static_chain_on_stack); diff --git a/gcc/testsuite/gcc.target/i386/eh_return-1.c b/gcc/testsuite/gcc.target/i386/eh_return-1.c index b21fd75fc93..43f94f01a97 100644 --- a/gcc/testsuite/gcc.target/i386/eh_return-1.c +++ b/gcc/testsuite/gcc.target/i386/eh_return-1.c @@ -1,5 +1,5 @@ /* { dg-do compile } */ -/* { dg-options "-O2 -march=haswell -mno-avx512f -mtune-ctrl=avx256_move_by_pieces" } */ +/* { dg-options "-O2 -mincoming-stack-boundary=4 -march=haswell -mno-avx512f -mtune-ctrl=avx256_move_by_pieces" } */ struct _Unwind_Context { diff --git a/gcc/testsuite/gcc.target/i386/eh_return-2.c b/gcc/testsuite/gcc.target/i386/eh_return-2.c index f23f4492dac..cb762f92cc2 100644 --- a/gcc/testsuite/gcc.target/i386/eh_return-2.c +++ b/gcc/testsuite/gcc.target/i386/eh_return-2.c @@ -1,6 +1,6 @@ /* PR target/101772 */ /* { dg-do compile } */ -/* { dg-additional-options "-O0 -march=x86-64 -mstackrealign" } */ +/* { dg-additional-options "-O0 -mincoming-stack-boundary=4 -march=x86-64 -mstackrealign" } */ struct _Unwind_Context _Unwind_Resume_or_Rethrow_this_context; diff --git a/libgcc/config.host b/libgcc/config.host index 094fd3ad254..7ac379d1fd4 100644 --- a/libgcc/config.host +++ b/libgcc/config.host @@ -1583,3 +1583,16 @@ case ${host} in tmake_file="$tmake_file t-gthr-noweak" ;; esac + +case ${host} in +i[34567]86-*-* | x86_64-*-*) + if test "${host_address}" = 32; then + case ${host} in + *-*-cygwin* | *-*-solaris2*) + # Disable SSE on unwind-c.c and unwind-dw2.c to avoid stack + # realignment with the 4-byte aligned incoming stack. + tmake_file="${tmake_file} i386/${host_address}/t-eh-return-no-sse" + ;; + esac + fi +esac diff --git a/libgcc/config/i386/32/t-eh-return-no-sse b/libgcc/config/i386/32/t-eh-return-no-sse new file mode 100644 index 00000000000..5a8c3135911 --- /dev/null +++ b/libgcc/config/i386/32/t-eh-return-no-sse @@ -0,0 +1,5 @@ +# Since eh_return doesn't work with stack realignment, disable SSE on +# unwind-c.c and unwind-dw2.c to avoid stack realignment with the 4-byte +# incoming stack. + +unwind-c.o unwind-c_s.o unwind-dw2.o unwind-dw2_s.o : HOST_LIBGCC2_CFLAGS += -mno-sse