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Hexagon (target/hexagon) Add overrides for count trailing zeros/ones 

The following instructions are overriden
    S2_ct0            Count trailing zeros
    S2_ct1            Count trailing ones
    S2_ct0p           Count trailing zeros (register pair)
    S2_ct1p           Count trailing ones (register pair)

These instructions are not handled by idef-parser because the
imported semantics uses bit-reverse.  However, they are
straightforward to implement in TCG with tcg_gen_ctzi_*

Test cases added to tests/tcg/hexagon/misc.c

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230405164211.30015-1-tsimpson@quicinc.com>
This commit is contained in:
Taylor Simpson 2023-03-07 14:40:58 -08:00
parent 2bda44e8aa
commit a52584815e
2 changed files with 79 additions and 1 deletions
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24
target/hexagon/gen_tcg.h
View File

@ -1058,6 +1058,30 @@
#define fGEN_TCG_SL2_jumpr31_fnew(SHORTCODE) \
gen_cond_jumpr31(ctx, TCG_COND_NE, hex_new_pred_value[0])
/* Count trailing zeros/ones */
#define fGEN_TCG_S2_ct0(SHORTCODE) \
do { \
tcg_gen_ctzi_tl(RdV, RsV, 32); \
} while (0)
#define fGEN_TCG_S2_ct1(SHORTCODE) \
do { \
tcg_gen_not_tl(RdV, RsV); \
tcg_gen_ctzi_tl(RdV, RdV, 32); \
} while (0)
#define fGEN_TCG_S2_ct0p(SHORTCODE) \
do { \
TCGv_i64 tmp = tcg_temp_new_i64(); \
tcg_gen_ctzi_i64(tmp, RssV, 64); \
tcg_gen_extrl_i64_i32(RdV, tmp); \
} while (0)
#define fGEN_TCG_S2_ct1p(SHORTCODE) \
do { \
TCGv_i64 tmp = tcg_temp_new_i64(); \
tcg_gen_not_i64(tmp, RssV); \
tcg_gen_ctzi_i64(tmp, tmp, 64); \
tcg_gen_extrl_i64_i32(RdV, tmp); \
} while (0)
/* Floating point */
#define fGEN_TCG_F2_conv_sf2df(SHORTCODE) \
gen_helper_conv_sf2df(RddV, cpu_env, RsV)

56
tests/tcg/hexagon/misc.c
View File

@ -1,5 +1,5 @@
/*
* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
* Copyright(c) 2019-2023 Qualcomm Innovation Center, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -21,6 +21,7 @@
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
typedef unsigned long long uint64_t;
static inline void S4_storerhnew_rr(void *p, int index, uint16_t v)
@ -333,6 +334,57 @@ void test_l2fetch(void)
"l2fetch(r0, r3:2)\n\t");
}
static inline int ct0(uint32_t x)
{
int res;
asm("%0 = ct0(%1)\n\t" : "=r"(res) : "r"(x));
return res;
}
static inline int ct1(uint32_t x)
{
int res;
asm("%0 = ct1(%1)\n\t" : "=r"(res) : "r"(x));
return res;
}
static inline int ct0p(uint64_t x)
{
int res;
asm("%0 = ct0(%1)\n\t" : "=r"(res) : "r"(x));
return res;
}
static inline int ct1p(uint64_t x)
{
int res;
asm("%0 = ct1(%1)\n\t" : "=r"(res) : "r"(x));
return res;
}
void test_count_trailing_zeros_ones(void)
{
check(ct0(0x0000000f), 0);
check(ct0(0x00000000), 32);
check(ct0(0x000000f0), 4);
check(ct1(0x000000f0), 0);
check(ct1(0x0000000f), 4);
check(ct1(0x00000000), 0);
check(ct1(0xffffffff), 32);
check(ct0p(0x000000000000000fULL), 0);
check(ct0p(0x0000000000000000ULL), 64);
check(ct0p(0x00000000000000f0ULL), 4);
check(ct1p(0x00000000000000f0ULL), 0);
check(ct1p(0x000000000000000fULL), 4);
check(ct1p(0x0000000000000000ULL), 0);
check(ct1p(0xffffffffffffffffULL), 64);
check(ct1p(0xffffffffff0fffffULL), 20);
check(ct1p(0xffffff0fffffffffULL), 36);
}
int main()
{
int res;
@ -468,6 +520,8 @@ int main()
test_l2fetch();
test_count_trailing_zeros_ones();
puts(err ? "FAIL" : "PASS");
return err;
}