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Re: [PATCH] Favour FLDMD over FLDMX where possible on ARM
- From: Paul Brook <paul at codesourcery dot com>
- To: gcc-patches at gcc dot gnu dot org
- Cc: Mark Shinwell <shinwell at codesourcery dot com>
- Date: Wed, 30 Aug 2006 18:33:34 +0100
- Subject: Re: [PATCH] Favour FLDMD over FLDMX where possible on ARM
- References: <44EDCC85.2050707@codesourcery.com>
> OK for mainline, once open?
Yes.
> 2006-08-24 Mark Shinwell <shinwell@codesourcery.com>
>
> * config/arm/arm.c (arm_output_fldmx): Output FLDMD instead of
> FLDMX if target supports FLDMD.
> (vfp_output_fstmx): Output FSTMD instead of FSTMX if target supports
> FLDMD.
> (vfp_emit_fstmx): Don't leave space in the frame layout for the
> FSTMX format word if using FSTMD.
> (arm_get_vfp_saved_size): Don't add in space for the FSTMX format word
> if using FSTMD/FLDMD instead of FSTMX/FLDMX.
> (arm_output_epilogue): Adjust comment to reflect use of FSTMD.
> (arm_unwind_emit_sequence): Don't compensate for the FSTMX format
> word if emitting FSTMD. Also emit "vsave" assembler directives in
> such cases rather than "save".
> * config/arm/libunwind.S (gnu_Unwind_Restore_VFP,
> gnu_Unwind_Save_VFP): Adjust comments.
> (gnu_Unwind_Restore_VFP_D, gnu_Unwind_Save_VFP_D): New functions
> for saving and restoring using FSTMD and FLDMD, rather than
> FSTMX and FLDMX.
> (gnu_Unwind_Restore_VFP_D_16_to_31, gnu_Unwind_Restore_VFP_D_16_to_31):
> New functions for saving and restoring the VFPv3 registers 16 .. 31.
> * config/arm/pr-support.c (gnu_unwind_execute): Add conditional
> compilation case to correctly handle unwind opcode 0xc8 when using
> VFP.
> * config/arm/unwind-arm.c (struct vfpv3_regs): New.
> (DEMAND_SAVE_VFP_D, DEMAND_SAVE_VFP_V3): New flags.
> (__gnu_Unwind_Save_VFP_D, __gnu_Unwind_Restore_VFP_D,
> __gnu_Unwind_Save_VFP_D_16_to_31, __gnu_Unwind_Restore_VFP_D_16_to_31):
> Declare.
> (restore_non_core_regs): Restore registers using FLDMD rather than
> FLDMX if required. Also handle restoration of VFPv3 registers.
> (_Unwind_VRS_Pop): Handle saving and restoring of registers using
> FSTMD and FLDMD if required; also handle VFPv3 registers 16 .. 31,
> including cases where the caller specifies a range of registers
> that overlaps the d15/d16 boundary.
> * config/arm/arm.h (TARGET_FLDMX): New.