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target/arm: Remove unnecessary range check for VSHL

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In 1dc8425e551, while converting to gvec, I added an extra range check
against the shift count. This was unnecessary because the encoding of
the shift count produces 0 to the element size - 1.

Backports commit 2f27c5244db300387f15d9ffa5067a204ffd625d from qemu
This commit is contained in:
Richard Henderson 2020-05-15 20:42:09 -04:00 committed by Lioncash
parent 6190be3191
commit 7a1750d691
1 changed files with 2 additions and 10 deletions
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12
qemu/target/arm/translate.c
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@ -5857,16 +5857,8 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
gen_gvec_sli(tcg_ctx, size, rd_ofs, rm_ofs, shift, gen_gvec_sli(tcg_ctx, size, rd_ofs, rm_ofs, shift,
vec_size, vec_size); vec_size, vec_size);
} else { /* VSHL */ } else { /* VSHL */
/* Shifts larger than the element size are tcg_gen_gvec_shli(tcg_ctx, size, rd_ofs, rm_ofs, shift,
* architecturally valid and results in zero. vec_size, vec_size);
*/
if (shift >= 8 << size) {
tcg_gen_gvec_dup_imm(tcg_ctx, size, rd_ofs,
vec_size, vec_size, 0);
} else {
tcg_gen_gvec_shli(tcg_ctx, size, rd_ofs, rm_ofs, shift,
vec_size, vec_size);
}
} }
return 0; return 0;
} }