From: Pan Li Date: Thu, 24 Aug 2023 09:29:02 +0000 (+0800) Subject: RISC-V: Support rounding mode for VFNMSAC/VFNMSUB autovec X-Git-Tag: basepoints/gcc-15~6539 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a7cefeaead68e5d89f65ba3a558eddef9b0b0f75;p=thirdparty%2Fgcc.git RISC-V: Support rounding mode for VFNMSAC/VFNMSUB autovec There will be a case like below for intrinsic and autovec combination. vfadd RTZ <- intrinisc static rounding vfnmsub <- autovec/autovec-opt The autovec generated vfnmsub should take DYN mode, and the frm must be restored before the vfnmsub insn. This patch would like to fix this issue by: * Add the frm operand to the autovec/autovec-opt pattern. * Set the frm_mode attr to DYN. Thus, the frm flow when combine autovec and intrinsic should be. +------------ | frrm a5 | ... | fsrmi 4 | vfadd <- intrinsic static rounding. | ... | fsrm a5 | vfnmsub <- autovec/autovec-opt | ... +------------ Signed-off-by: Pan Li gcc/ChangeLog: * config/riscv/autovec-opt.md: Add FRM_REGNUM to vfnmsac/vfnmsub * config/riscv/autovec.md: Ditto. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/float-point-frm-autovec-3.c: New test. Signed-off-by: Pan Li --- diff --git a/gcc/config/riscv/autovec-opt.md b/gcc/config/riscv/autovec-opt.md index 81cf0fd24949..d8dba1835bbf 100644 --- a/gcc/config/riscv/autovec-opt.md +++ b/gcc/config/riscv/autovec-opt.md @@ -523,13 +523,15 @@ ;; vect__13.182_33 = .FNMA (vect__11.180_35, vect__8.176_40, vect__4.172_45); (define_insn_and_split "*double_widen_fnma" [(set (match_operand:VWEXTF 0 "register_operand") - (fma:VWEXTF - (neg:VWEXTF + (unspec:VWEXTF + [(fma:VWEXTF + (neg:VWEXTF + (float_extend:VWEXTF + (match_operand: 2 "register_operand"))) (float_extend:VWEXTF - (match_operand: 2 "register_operand"))) - (float_extend:VWEXTF - (match_operand: 3 "register_operand")) - (match_operand:VWEXTF 1 "register_operand")))] + (match_operand: 3 "register_operand")) + (match_operand:VWEXTF 1 "register_operand")) + (reg:SI FRM_REGNUM)] UNSPEC_VFFMA))] "TARGET_VECTOR && can_create_pseudo_p ()" "#" "&& 1" @@ -540,17 +542,20 @@ DONE; } [(set_attr "type" "vfwmuladd") - (set_attr "mode" "")]) + (set_attr "mode" "") + (set (attr "frm_mode") (symbol_ref "riscv_vector::FRM_DYN"))]) ;; This helps to match ext + fnma. (define_insn_and_split "*single_widen_fnma" [(set (match_operand:VWEXTF 0 "register_operand") - (fma:VWEXTF - (neg:VWEXTF - (float_extend:VWEXTF - (match_operand: 2 "register_operand"))) - (match_operand:VWEXTF 3 "register_operand") - (match_operand:VWEXTF 1 "register_operand")))] + (unspec:VWEXTF + [(fma:VWEXTF + (neg:VWEXTF + (float_extend:VWEXTF + (match_operand: 2 "register_operand"))) + (match_operand:VWEXTF 3 "register_operand") + (match_operand:VWEXTF 1 "register_operand")) + (reg:SI FRM_REGNUM)] UNSPEC_VFFMA))] "TARGET_VECTOR && can_create_pseudo_p ()" "#" "&& 1" @@ -567,7 +572,8 @@ DONE; } [(set_attr "type" "vfwmuladd") - (set_attr "mode" "")]) + (set_attr "mode" "") + (set (attr "frm_mode") (symbol_ref "riscv_vector::FRM_DYN"))]) ;; ------------------------------------------------------------------------- ;; ---- [FP] VFWMSAC diff --git a/gcc/config/riscv/autovec.md b/gcc/config/riscv/autovec.md index f7ea4465c361..fbe8dbc82b3a 100644 --- a/gcc/config/riscv/autovec.md +++ b/gcc/config/riscv/autovec.md @@ -1170,24 +1170,29 @@ (define_expand "fnma4" [(parallel [(set (match_operand:VF 0 "register_operand") - (fma:VF - (neg:VF - (match_operand:VF 1 "register_operand")) - (match_operand:VF 2 "register_operand") - (match_operand:VF 3 "register_operand"))) + (unspec:VF + [(fma:VF + (neg:VF + (match_operand:VF 1 "register_operand")) + (match_operand:VF 2 "register_operand") + (match_operand:VF 3 "register_operand")) + (reg:SI FRM_REGNUM)] UNSPEC_VFFMA)) (clobber (match_dup 4))])] "TARGET_VECTOR" { operands[4] = gen_reg_rtx (Pmode); - }) + } + [(set (attr "frm_mode") (symbol_ref "riscv_vector::FRM_DYN"))]) (define_insn_and_split "*fnma" [(set (match_operand:VF 0 "register_operand" "=vr, vr, ?&vr") - (fma:VF - (neg:VF - (match_operand:VF 1 "register_operand" " %0, vr, vr")) - (match_operand:VF 2 "register_operand" " vr, vr, vr") - (match_operand:VF 3 "register_operand" " vr, 0, vr"))) + (unspec:VF + [(fma:VF + (neg:VF + (match_operand:VF 1 "register_operand" " %0, vr, vr")) + (match_operand:VF 2 "register_operand" " vr, vr, vr") + (match_operand:VF 3 "register_operand" " vr, 0, vr")) + (reg:SI FRM_REGNUM)] UNSPEC_VFFMA)) (clobber (match_operand:P 4 "register_operand" "=r,r,r"))] "TARGET_VECTOR" "#" diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-frm-autovec-3.c b/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-frm-autovec-3.c new file mode 100644 index 000000000000..abedfc1b8fb0 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/base/float-point-frm-autovec-3.c @@ -0,0 +1,88 @@ +/* { dg-do compile } */ +/* { dg-options "-march=rv64gcv --param=riscv-autovec-preference=fixed-vlmax -ffast-math -mabi=lp64 -O3 -Wno-psabi" } */ +/* { dg-final { check-function-bodies "**" "" } } */ + +#include "riscv_vector.h" + +/* +**test_1: +** ... +** frrm\t[axt][0-9]+ +** ... +** fsrmi\t1 +** ... +** vfadd\.vv\tv[0-9]+,v[0-9]+,v[0-9]+ +** ... +** fsrm\t[axt][0-9]+ +** ... +** vfnmsub\.vv\tv[0-9]+,v[0-9]+,v[0-9]+ +** ... +** ret +*/ +void +test_1 (vfloat32m1_t op1, vfloat32m1_t op2, vfloat32m1_t *op_out, size_t vl, + double *in1, double *in2, double *out) +{ + *op_out = __riscv_vfadd_vv_f32m1_rm (op1, op2, 1, vl); + + for (int i = 0; i < vl; ++i) + out[i] = - in1[i] * in2[i] + out[i]; +} + +/* +**test_2: +** ... +** frrm\t[axt][0-9]+ +** ... +** fsrmi\t1 +** ... +** vfadd\.vv\tv[0-9]+,v[0-9]+,v[0-9]+ +** ... +** fsrm\t[axt][0-9]+ +** ... +** vfnmsub\.vv\tv[0-9]+,v[0-9]+,v[0-9]+ +** ... +** fsrmi\t4 +** ... +** vfadd\.vv\tv[0-9]+,v[0-9]+,v[0-9]+ +** ... +** fsrm\t[axt][0-9]+ +** ... +** ret +*/ +void +test_2 (vfloat32m1_t op1, vfloat32m1_t op2, vfloat32m1_t *op_out, size_t vl, + double *in1, double *in2, double *out) +{ + op2 = __riscv_vfadd_vv_f32m1_rm (op1, op2, 1, vl); + + for (int i = 0; i < vl; ++i) + out[i] = - out[i] * in1[i] + in2[i]; + + *op_out = __riscv_vfadd_vv_f32m1_rm (op1, op2, 4, vl); +} + +/* +**test_3: +** ... +** frrm\t[axt][0-9]+ +** ... +** vfnmsub\.vv\tv[0-9]+,v[0-9]+,v[0-9]+ +** ... +** fsrmi\t4 +** ... +** vfadd\.vv\tv[0-9]+,v[0-9]+,v[0-9]+ +** ... +** fsrm\t[axt][0-9]+ +** ... +** ret +*/ +void +test_3 (vfloat32m1_t op1, vfloat32m1_t op2, vfloat32m1_t *op_out, size_t vl, + double *in1, double *in2, double *in3, double *out) +{ + for (int i = 0; i < vl; ++i) + out[i] = - in2[i] * out[i] + in1[i]; + + *op_out = __riscv_vfadd_vv_f32m1_rm (op1, op2, 4, vl); +}