[PATCH, GCC/ARM] Rewire -mfpu=fp-armv8 as VFPv5 + D32 + DP
Richard Earnshaw (lists)
Richard.Earnshaw@arm.com
Fri Jul 14 14:43:00 GMT 2017
On 14/07/17 09:20, Thomas Preudhomme wrote:
> Hi,
>
> fp-armv8 is currently defined as a double precision FPv5 with 32 D
> registers *and* a special FP_ARMv8 bit. However FP for ARMv8 should only
> bring 32 D registers on top of FPv5-D16 so this FP_ARMv8 bit is
> spurious. As a consequence, many instruction patterns which are guarded
> by TARGET_FPU_ARMV8 are unavailable to FPv5-D16 and FPv5-SP-D16.
>
> This patch gets rid of TARGET_FPU_ARMV8 and rewire all uses to
> expressions based on TARGET_VFP5, TARGET_VFPD32 and TARGET_VFP_DOUBLE.
> It also redefine ISA_FP_ARMv8 to include the D32 capability to
> distinguish it from FPv5-D16. At last, it sets the +fp.sp for ARMv8-R to
> enable FPv5-SP-D16 (ie FP for ARMv8 with single precision only and 16 D
> registers).
>
> ChangeLog entry is as follows:
>
> 2017-07-07 Thomas Preud'homme <thomas.preudhomme@arm.com>
>
> * config/arm/arm-isa.h (isa_bit_FP_ARMv8): Delete enumerator.
> (ISA_FP_ARMv8): Define as ISA_FPv5 and ISA_FP_D32.
> * config/arm/arm-cpus.in (armv8-r): Define fp.sp as enabling FPv5.
> (fp-armv8): Define it as FP_ARMv8 only.
> config/arm/arm.h (TARGET_FPU_ARMV8): Delete.
> (TARGET_VFP_FP16INST): Define using TARGET_VFP5 rather than
> TARGET_FPU_ARMV8.
> config/arm/arm.c (arm_rtx_costs_internal): Replace checks against
> TARGET_FPU_ARMV8 by checks against TARGET_VFP5.
> * config/arm/arm-builtins.c (arm_builtin_vectorized_function): Define
> first ARM_CHECK_BUILTIN_MODE definition using TARGET_VFP5 rather
> than TARGET_FPU_ARMV8.
> * config/arm/arm-c.c (arm_cpu_builtins): Likewise for
> __ARM_FEATURE_NUMERIC_MAXMIN macro definition.
> * config/arm/arm.md (cmov<mode>): Condition on TARGET_VFP5 rather than
> TARGET_FPU_ARMV8.
> * config/arm/neon.md (neon_vrint): Likewise.
> (neon_vcvt): Likewise.
> (neon_<fmaxmin_op><mode>): Likewise.
> (<fmaxmin><mode>3): Likewise.
> * config/arm/vfp.md (l<vrint_pattern><su_optab><mode>si2): Likewise.
> * config/arm/predicates.md (arm_cond_move_operator): Check against
> TARGET_VFP5 rather than TARGET_FPU_ARMV8 and fix spacing.
>
> Testing:
> * Bootstrapped under ARMv8-A Thumb state and ran testsuite -> no
> regression
> * built Spec2000 and Spec2006 with -march=armv8-a+fp16 and compared
> objdump -> no code generation difference
>
> Is this ok for trunk?
OK with changes mentioned below.
R.
>
> Best regards,
>
> Thomas
>
> rewire_mfpu_fparmv8.patch
>
>
> diff --git a/gcc/config/arm/arm-builtins.c b/gcc/config/arm/arm-builtins.c
> index 63ee880822c17eda55dd58438d61cbbba333b2c6..7504ed581c63a657a0dff48442633704bd252b2e 100644
> --- a/gcc/config/arm/arm-builtins.c
> +++ b/gcc/config/arm/arm-builtins.c
> @@ -3098,7 +3098,7 @@ arm_builtin_vectorized_function (unsigned int fn, tree type_out, tree type_in)
> NULL_TREE is returned if no such builtin is available. */
> #undef ARM_CHECK_BUILTIN_MODE
> #define ARM_CHECK_BUILTIN_MODE(C) \
> - (TARGET_FPU_ARMV8 \
> + (TARGET_VFP5 \
> && flag_unsafe_math_optimizations \
> && ARM_CHECK_BUILTIN_MODE_1 (C))
>
> diff --git a/gcc/config/arm/arm-c.c b/gcc/config/arm/arm-c.c
> index a3daa3220a2bc4220dffdb7ca08ca9419bdac425..9178937b6d9e0fe5d0948701390c4cf01f4f8c7d 100644
> --- a/gcc/config/arm/arm-c.c
> +++ b/gcc/config/arm/arm-c.c
> @@ -96,7 +96,7 @@ arm_cpu_builtins (struct cpp_reader* pfile)
> || TARGET_ARM_ARCH_ISA_THUMB >=2));
>
> def_or_undef_macro (pfile, "__ARM_FEATURE_NUMERIC_MAXMIN",
> - TARGET_ARM_ARCH >= 8 && TARGET_NEON && TARGET_FPU_ARMV8);
> + TARGET_ARM_ARCH >= 8 && TARGET_NEON && TARGET_VFP5);
This looks wrong (though ACLE is misleading). The MAXMIN property is
solely defined by having an FPv5 capable FPU.
>
> def_or_undef_macro (pfile, "__ARM_FEATURE_SIMD32", TARGET_INT_SIMD);
>
> diff --git a/gcc/config/arm/arm-cpus.in b/gcc/config/arm/arm-cpus.in
> index f35128acb7d68c6a0592355b9d3d56ee8f826aca..e2ff297aed7514073dbb3bf5ee86964f202e5a14 100644
> --- a/gcc/config/arm/arm-cpus.in
> +++ b/gcc/config/arm/arm-cpus.in
> @@ -389,7 +389,7 @@ begin arch armv8-r
> option crc add bit_crc32
> # fp.sp => fp-armv8 (d16); simd => simd + fp-armv8 + d32 + double precision
Please update comment
> # note: no fp option for fp-armv8 (d16) + double precision at the moment
> - option fp.sp add FP_ARMv8
> + option fp.sp add FPv5
> option simd add FP_ARMv8 NEON
> option crypto add FP_ARMv8 CRYPTO
> option nocrypto remove ALL_CRYPTO
> @@ -1390,7 +1390,7 @@ begin fpu fpv5-d16
> end fpu fpv5-d16
>
> begin fpu fp-armv8
> - isa FP_ARMv8 FP_D32
> + isa FP_ARMv8
> end fpu fp-armv8
>
> begin fpu neon-fp-armv8
> diff --git a/gcc/config/arm/arm-isa.h b/gcc/config/arm/arm-isa.h
> index 0d66a0400c517668db023fc66ff43e26d43add51..dbd29eaa52f2007498c2aff6263b8b6c3a70e2c2 100644
> --- a/gcc/config/arm/arm-isa.h
> +++ b/gcc/config/arm/arm-isa.h
> @@ -60,7 +60,6 @@ enum isa_feature
> isa_bit_VFPv4, /* Vector floating point v4. */
> isa_bit_FPv5, /* Floating point v5. */
> isa_bit_lpae, /* ARMv7-A LPAE. */
> - isa_bit_FP_ARMv8, /* ARMv8 floating-point extension. */
> isa_bit_neon, /* Advanced SIMD instructions. */
> isa_bit_fp16conv, /* Conversions to/from fp16 (VFPv3 extension). */
> isa_bit_fp_dbl, /* Double precision operations supported. */
> @@ -143,7 +142,7 @@ enum isa_feature
> default. isa_bit_fp16 is deliberately missing from this list. */
> #define ISA_ALL_FPU_INTERNAL \
> isa_bit_VFPv2, isa_bit_VFPv3, isa_bit_VFPv4, isa_bit_FPv5, \
> - isa_bit_FP_ARMv8, isa_bit_fp16conv, isa_bit_fp_dbl, ISA_ALL_SIMD
> + isa_bit_fp16conv, isa_bit_fp_dbl, ISA_ALL_SIMD
>
> /* Similarly, but including fp16 and other extensions that aren't part of
> -mfpu support. */
> @@ -154,10 +153,10 @@ enum isa_feature
> #define ISA_VFPv3 ISA_VFPv2, isa_bit_VFPv3
> #define ISA_VFPv4 ISA_VFPv3, isa_bit_VFPv4, isa_bit_fp16conv
> #define ISA_FPv5 ISA_VFPv4, isa_bit_FPv5
> -#define ISA_FP_ARMv8 ISA_FPv5, isa_bit_FP_ARMv8
>
> #define ISA_FP_DBL isa_bit_fp_dbl
> #define ISA_FP_D32 ISA_FP_DBL, isa_bit_fp_d32
> +#define ISA_FP_ARMv8 ISA_FPv5, ISA_FP_D32
> #define ISA_NEON ISA_FP_D32, isa_bit_neon
> #define ISA_CRYPTO ISA_NEON, isa_bit_crypto
>
> diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
> index 315622212a5ce10d0c771535fe31f63c3be16444..4f53583cf0219de4329bc64a47a5a42c550ff354 100644
> --- a/gcc/config/arm/arm.h
> +++ b/gcc/config/arm/arm.h
> @@ -196,10 +196,6 @@ extern tree arm_fp16_type_node;
> /* FPU supports fused-multiply-add operations. */
> #define TARGET_FMA (bitmap_bit_p (arm_active_target.isa, isa_bit_VFPv4))
>
> -/* FPU is ARMv8 compatible. */
> -#define TARGET_FPU_ARMV8 \
> - (bitmap_bit_p (arm_active_target.isa, isa_bit_FP_ARMv8))
> -
> /* FPU supports Crypto extensions. */
> #define TARGET_CRYPTO (bitmap_bit_p (arm_active_target.isa, isa_bit_crypto))
>
> @@ -216,7 +212,7 @@ extern tree arm_fp16_type_node;
>
> /* FPU supports the floating point FP16 instructions for ARMv8.2 and later. */
> #define TARGET_VFP_FP16INST \
> - (TARGET_32BIT && TARGET_HARD_FLOAT && TARGET_FPU_ARMV8 && arm_fp16_inst)
> + (TARGET_32BIT && TARGET_HARD_FLOAT && TARGET_VFP5 && arm_fp16_inst)
>
> /* FPU supports the AdvSIMD FP16 instructions for ARMv8.2 and later. */
> #define TARGET_NEON_FP16INST (TARGET_VFP_FP16INST && TARGET_NEON_RDMA)
> diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
> index c6101efd555996a4c6db5eaea0130b0940c4cff8..f59132c3f079d10d9e3d920b61037db2f3144eee 100644
> --- a/gcc/config/arm/arm.c
> +++ b/gcc/config/arm/arm.c
> @@ -10755,7 +10755,7 @@ arm_rtx_costs_internal (rtx x, enum rtx_code code, enum rtx_code outer_code,
> {
> if (speed_p)
> *cost += extra_cost->fp[mode == DFmode].widen;
> - if (!TARGET_FPU_ARMV8
> + if (!TARGET_VFP5
> && GET_MODE (XEXP (x, 0)) == HFmode)
> {
> /* Pre v8, widening HF->DF is a two-step process, first
> @@ -10849,7 +10849,7 @@ arm_rtx_costs_internal (rtx x, enum rtx_code code, enum rtx_code outer_code,
> return true;
> }
> else if (GET_MODE_CLASS (mode) == MODE_FLOAT
> - && TARGET_FPU_ARMV8)
> + && TARGET_VFP5)
> {
> if (speed_p)
> *cost += extra_cost->fp[mode == DFmode].roundint;
> diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
> index e6e1ac54a850c35807d683804f5294fbef1487ad..049a78edefe9f85c6f84a4ecf0158d559e1d5674 100644
> --- a/gcc/config/arm/arm.md
> +++ b/gcc/config/arm/arm.md
> @@ -7879,7 +7879,7 @@
> "<F_constraint>")
> (match_operand:SDF 4 "s_register_operand"
> "<F_constraint>")))]
> - "TARGET_HARD_FLOAT && TARGET_FPU_ARMV8 <vfp_double_cond>"
> + "TARGET_HARD_FLOAT && TARGET_VFP5 <vfp_double_cond>"
> "*
> {
> enum arm_cond_code code = maybe_get_arm_condition_code (operands[1]);
> diff --git a/gcc/config/arm/neon.md b/gcc/config/arm/neon.md
> index 33b25ff3c730544b4376bf318400d703c8813a0a..235c46da1a19712e2924d748545474ed991d9f92 100644
> --- a/gcc/config/arm/neon.md
> +++ b/gcc/config/arm/neon.md
> @@ -751,7 +751,7 @@
> (unspec:VCVTF [(match_operand:VCVTF 1
> "s_register_operand" "w")]
> NEON_VRINT))]
> - "TARGET_NEON && TARGET_FPU_ARMV8"
> + "TARGET_NEON && TARGET_VFP5"
> "vrint<nvrint_variant>.f32\\t%<V_reg>0, %<V_reg>1"
> [(set_attr "type" "neon_fp_round_<V_elem_ch><q>")]
> )
> @@ -761,7 +761,7 @@
> (FIXUORS:<V_cmp_result> (unspec:VCVTF
> [(match_operand:VCVTF 1 "register_operand" "w")]
> NEON_VCVT)))]
> - "TARGET_NEON && TARGET_FPU_ARMV8"
> + "TARGET_NEON && TARGET_VFP5"
> "vcvt<nvrint_variant>.<su>32.f32\\t%<V_reg>0, %<V_reg>1"
> [(set_attr "type" "neon_fp_to_int_<V_elem_ch><q>")
> (set_attr "predicable" "no")]
> @@ -2901,7 +2901,7 @@
> (unspec:VCVTF [(match_operand:VCVTF 1 "s_register_operand" "w")
> (match_operand:VCVTF 2 "s_register_operand" "w")]
> VMAXMINFNM))]
> - "TARGET_NEON && TARGET_FPU_ARMV8"
> + "TARGET_NEON && TARGET_VFP5"
> "<fmaxmin_op>.<V_s_elem>\t%<V_reg>0, %<V_reg>1, %<V_reg>2"
> [(set_attr "type" "neon_fp_minmax_s<q>")]
> )
> @@ -2912,7 +2912,7 @@
> (unspec:VCVTF [(match_operand:VCVTF 1 "s_register_operand" "w")
> (match_operand:VCVTF 2 "s_register_operand" "w")]
> VMAXMINFNM))]
> - "TARGET_NEON && TARGET_FPU_ARMV8"
> + "TARGET_NEON && TARGET_VFP5"
> "<fmaxmin_op>.<V_s_elem>\t%<V_reg>0, %<V_reg>1, %<V_reg>2"
> [(set_attr "type" "neon_fp_minmax_s<q>")]
> )
> diff --git a/gcc/config/arm/predicates.md b/gcc/config/arm/predicates.md
> index afb5d6339a8af362384c93bbb46928635073b74b..3e25cd16b29231d53b4cadce3db0fbb3168cd4c5 100644
> --- a/gcc/config/arm/predicates.md
> +++ b/gcc/config/arm/predicates.md
> @@ -350,9 +350,9 @@
>
> (define_special_predicate "arm_cond_move_operator"
> (if_then_else (match_test "arm_restrict_it")
> - (and (match_test "TARGET_FPU_ARMV8")
> - (match_operand 0 "arm_vsel_comparison_operator"))
> - (match_operand 0 "expandable_comparison_operator")))
> + (and (match_test "TARGET_VFP5")
> + (match_operand 0 "arm_vsel_comparison_operator"))
> + (match_operand 0 "expandable_comparison_operator")))
>
> (define_special_predicate "noov_comparison_operator"
> (match_code "lt,ge,eq,ne"))
> diff --git a/gcc/config/arm/vfp.md b/gcc/config/arm/vfp.md
> index d8f77e2ffe4fdb7c952d6a5ac947d91f89ce259d..23c1d67c9e3707e64a4e206dc62727e4c79ba89c 100644
> --- a/gcc/config/arm/vfp.md
> +++ b/gcc/config/arm/vfp.md
> @@ -1997,7 +1997,7 @@
> (FIXUORS:SI (unspec:SDF
> [(match_operand:SDF 1
> "register_operand" "<F_constraint>")] VCVT)))]
> - "TARGET_HARD_FLOAT && TARGET_FPU_ARMV8 <vfp_double_cond>"
> + "TARGET_HARD_FLOAT && TARGET_VFP5 <vfp_double_cond>"
> "vcvt<vrint_variant>.<su>32.<V_if_elem>\\t%0, %<V_reg>1"
> [(set_attr "predicable" "no")
> (set_attr "conds" "unconditional")
>
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