From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2028) id EE3FA384A030; Thu, 5 Nov 2020 14:58:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org EE3FA384A030 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Qing Zhao To: gcc-cvs@gcc.gnu.org Subject: [gcc r11-4741] i386: Fix PR97715 X-Act-Checkin: gcc X-Git-Author: qing zhao X-Git-Refname: refs/heads/master X-Git-Oldrev: 54cbdb528df16686290ad26e2130a1896915639d X-Git-Newrev: cc32e81cdbb7696cd571bdb5ffe52f228f125df5 Message-Id: <20201105145802.EE3FA384A030@sourceware.org> Date: Thu, 5 Nov 2020 14:58:02 +0000 (GMT) X-BeenThere: gcc-cvs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 14:58:03 -0000 https://gcc.gnu.org/g:cc32e81cdbb7696cd571bdb5ffe52f228f125df5 commit r11-4741-gcc32e81cdbb7696cd571bdb5ffe52f228f125df5 Author: qing zhao Date: Thu Nov 5 15:57:46 2020 +0100 i386: Fix PR97715 This change fixes a bug in the i386 backend when adding -fzero-call-used-regs=all on a target that has no x87 registers. When there is no x87 registers available, we should not zero stack registers. gcc/ChangeLog: PR target/97715 * config/i386/i386.c (zero_all_st_registers): Return earlier when the FPU is disabled. gcc/testsuite/ChangeLog: PR target/97715 * gcc.target/i386/zero-scratch-regs-32.c: New test. Diff: --- gcc/config/i386/i386.c | 5 +++++ gcc/testsuite/gcc.target/i386/zero-scratch-regs-32.c | 11 +++++++++++ 2 files changed, 16 insertions(+) diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 6fc6228a26e..789ef727cf8 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -3640,6 +3640,11 @@ zero_all_vector_registers (HARD_REG_SET need_zeroed_hardregs) static bool zero_all_st_registers (HARD_REG_SET need_zeroed_hardregs) { + + /* If the FPU is disabled, no need to zero all st registers. */ + if (! (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387)) + return false; + unsigned int num_of_st = 0; for (unsigned int regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) if ((STACK_REGNO_P (regno) || MMX_REGNO_P (regno)) diff --git a/gcc/testsuite/gcc.target/i386/zero-scratch-regs-32.c b/gcc/testsuite/gcc.target/i386/zero-scratch-regs-32.c new file mode 100644 index 00000000000..ca3261fe5ea --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/zero-scratch-regs-32.c @@ -0,0 +1,11 @@ +/* { dg-do compile { target *-*-linux* } } */ +/* { dg-options "-O2 -fzero-call-used-regs=all -mno-80387" } */ + +int +foo (int x) +{ + return (x + 1); +} + +/* { dg-final { scan-assembler-not "fldz" } } */ +