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target/arm: Avoid tcg_const_ptr in handle_rev 

Here it is not trivial to notice first initialization, so explicitly
zero the temps.  Use an array for the output, rather than separate
tcg_rd/tcg_rd_hi variables.

Fixes a bug by adding a missing clear_vec_high.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-02-25 12:29:41 -10:00
parent 1b7bc9b5c8
commit 56649fd949
1 changed files with 15 additions and 11 deletions
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26
target/arm/tcg/translate-a64.c
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@ -12003,22 +12003,26 @@ static void handle_rev(DisasContext *s, int opcode, bool u,
int esize = 8 << size;
int elements = dsize / esize;
TCGv_i64 tcg_rn = tcg_temp_new_i64();
TCGv_i64 tcg_rd = tcg_const_i64(0);
TCGv_i64 tcg_rd_hi = tcg_const_i64(0);
TCGv_i64 tcg_rd[2];
for (i = 0; i < 2; i++) {
tcg_rd[i] = tcg_temp_new_i64();
tcg_gen_movi_i64(tcg_rd[i], 0);
}
for (i = 0; i < elements; i++) {
int e_rev = (i & 0xf) ^ revmask;
int off = e_rev * esize;
int w = (e_rev * esize) / 64;
int o = (e_rev * esize) % 64;
read_vec_element(s, tcg_rn, rn, i, size);
if (off >= 64) {
tcg_gen_deposit_i64(tcg_rd_hi, tcg_rd_hi,
tcg_rn, off - 64, esize);
} else {
tcg_gen_deposit_i64(tcg_rd, tcg_rd, tcg_rn, off, esize);
}
tcg_gen_deposit_i64(tcg_rd[w], tcg_rd[w], tcg_rn, o, esize);
}
write_vec_element(s, tcg_rd, rd, 0, MO_64);
write_vec_element(s, tcg_rd_hi, rd, 1, MO_64);
for (i = 0; i < 2; i++) {
write_vec_element(s, tcg_rd[i], rd, i, MO_64);
}
clear_vec_high(s, true, rd);
}
}