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target/arm: Simplify BFXIL expansion

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The mask implied by the extract is redundant with the one
implied by the deposit. Also, fix spelling of BFXIL.

Backports commit 87eb65a3c45c788a309986d48170a54a0d1c0705 from qemu
This commit is contained in:
Richard Henderson 2019-05-24 18:01:03 -04:00 committed by Lioncash
parent 1778828644
commit 9287750362
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GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 3 additions and 3 deletions
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6
qemu/target/arm/translate-a64.c
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@ -4126,8 +4126,8 @@ static void disas_bitfield(DisasContext *s, uint32_t insn)
tcg_gen_extract_i64(tcg_ctx, tcg_rd, tcg_tmp, ri, len);
return;
}
/* opc == 1, BXFIL fall through to deposit */
tcg_gen_extract_i64(tcg_ctx, tcg_tmp, tcg_tmp, ri, len);
/* opc == 1, BFXIL fall through to deposit */
tcg_gen_shri_i64(tcg_ctx, tcg_tmp, tcg_tmp, ri);
pos = 0;
} else {
/* Handle the ri > si case with a deposit
@ -4145,7 +4145,7 @@ static void disas_bitfield(DisasContext *s, uint32_t insn)
len = ri;
}
if (opc == 1) { /* BFM, BXFIL */
if (opc == 1) { /* BFM, BFXIL */
tcg_gen_deposit_i64(tcg_ctx, tcg_rd, tcg_rd, tcg_tmp, pos, len);
} else {
/* SBFM or UBFM: We start with zero, and we haven't modified