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[Qemu-devel] Re: [PATCH] Fix extlh instruction on Alpha
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From: |
Andreas Schwab |
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Subject: |
[Qemu-devel] Re: [PATCH] Fix extlh instruction on Alpha |
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Date: |
Thu, 17 Sep 2009 18:35:32 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) |
Vince Weaver <address@hidden> writes:
> tcg_gen_andi_i64(tmp1, cpu_ir[rb], 7);
> tcg_gen_shli_i64(tmp1, tmp1, 3);
> - tmp2 = tcg_const_i64(64);
> - tcg_gen_sub_i64(tmp1, tmp2, tmp1);
> - tcg_temp_free(tmp2);
> + tcg_gen_andi_i64(tmp1, tmp1, 0x3f);
> + tcg_gen_neg_i64(tmp1, tmp1);
> + tcg_gen_addi_i64(tmp1, tmp1, 64);
This wastes an operation. If you switch andi and neg you don't need to
add 64.
Andreas.
--
Andreas Schwab, address@hidden
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."