From 69675d50f68e63d603b33d0d225686d136546a09 Mon Sep 17 00:00:00 2001 From: Tejas Belagod Date: Mon, 20 Jan 2014 12:34:13 +0000 Subject: [PATCH] [AArch64] Relax CANNOT_CHANGE_MODE_CLASS gcc/ * config/aarch64/aarch64-protos.h (aarch64_cannot_change_mode_class_ptr): Declare. * config/aarch64/aarch64.c (aarch64_cannot_change_mode_class, aarch64_cannot_change_mode_class_ptr): New. * config/aarch64/aarch64.h (CANNOT_CHANGE_MODE_CLASS): Change to call backend hook aarch64_cannot_change_mode_class. From-SVN: r206804 --- gcc/ChangeLog | 9 +++++++++ gcc/config/aarch64/aarch64-protos.h | 3 +++ gcc/config/aarch64/aarch64.c | 36 ++++++++++++++++++++++++++++++++++++ gcc/config/aarch64/aarch64.h | 7 +------ 4 files changed, 49 insertions(+), 6 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f3e09e8..de8322b 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,12 @@ +2014-01-20 Tejas Belagod + + * config/aarch64/aarch64-protos.h + (aarch64_cannot_change_mode_class_ptr): Declare. + * config/aarch64/aarch64.c (aarch64_cannot_change_mode_class, + aarch64_cannot_change_mode_class_ptr): New. + * config/aarch64/aarch64.h (CANNOT_CHANGE_MODE_CLASS): Change to call + backend hook aarch64_cannot_change_mode_class. + 2014-01-20 James Greenhalgh * common/config/aarch64/aarch64-common.c diff --git a/gcc/config/aarch64/aarch64-protos.h b/gcc/config/aarch64/aarch64-protos.h index c5ac48b..5542f02 100644 --- a/gcc/config/aarch64/aarch64-protos.h +++ b/gcc/config/aarch64/aarch64-protos.h @@ -161,6 +161,9 @@ struct tune_params HOST_WIDE_INT aarch64_initial_elimination_offset (unsigned, unsigned); bool aarch64_bitmask_imm (HOST_WIDE_INT val, enum machine_mode); +bool aarch64_cannot_change_mode_class (enum machine_mode, + enum machine_mode, + enum reg_class); enum aarch64_symbol_type aarch64_classify_symbolic_expression (rtx, enum aarch64_symbol_context); bool aarch64_constant_address_p (rtx); diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 7091d3e..57b6645 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -8259,6 +8259,42 @@ aarch64_vectorize_vec_perm_const_ok (enum machine_mode vmode, return ret; } +/* Implement target hook CANNOT_CHANGE_MODE_CLASS. */ +bool +aarch64_cannot_change_mode_class (enum machine_mode from, + enum machine_mode to, + enum reg_class rclass) +{ + /* Full-reg subregs are allowed on general regs or any class if they are + the same size. */ + if (GET_MODE_SIZE (from) == GET_MODE_SIZE (to) + || !reg_classes_intersect_p (FP_REGS, rclass)) + return false; + + /* Limited combinations of subregs are safe on FPREGs. Particularly, + 1. Vector Mode to Scalar mode where 1 unit of the vector is accessed. + 2. Scalar to Scalar for integer modes or same size float modes. + 3. Vector to Vector modes. */ + if (GET_MODE_SIZE (from) > GET_MODE_SIZE (to)) + { + if (aarch64_vector_mode_supported_p (from) + && GET_MODE_SIZE (GET_MODE_INNER (from)) == GET_MODE_SIZE (to)) + return false; + + if (GET_MODE_NUNITS (from) == 1 + && GET_MODE_NUNITS (to) == 1 + && (GET_MODE_CLASS (from) == MODE_INT + || from == to)) + return false; + + if (aarch64_vector_mode_supported_p (from) + && aarch64_vector_mode_supported_p (to)) + return false; + } + + return true; +} + #undef TARGET_ADDRESS_COST #define TARGET_ADDRESS_COST aarch64_address_cost diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h index 4aa1bfd..a08dee0 100644 --- a/gcc/config/aarch64/aarch64.h +++ b/gcc/config/aarch64/aarch64.h @@ -822,13 +822,8 @@ do { \ extern void __aarch64_sync_cache_range (void *, void *); \ __aarch64_sync_cache_range (beg, end) -/* VFP registers may only be accessed in the mode they - were set. */ #define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \ - (GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO) \ - ? reg_classes_intersect_p (FP_REGS, (CLASS)) \ - : 0) - + aarch64_cannot_change_mode_class (FROM, TO, CLASS) #define SHIFT_COUNT_TRUNCATED !TARGET_SIMD -- 2.7.4