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| author | Kartik Agaram <vc@akkartik.com> | 2020-03-06 18:31:14 -0800 |
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| committer | Kartik Agaram <vc@akkartik.com> | 2020-03-06 18:34:27 -0800 |
| commit | 8f256f1f2ee6a2a49816dd23d26cd120f526bf0b (patch) | |
| tree | 314294998b527980cdf85ecb51386642bfbe3af4 /html/apps/ex14.subx.html | |
| parent | 4c19dd3968d2ce733073774867d97cc96b4277e6 (diff) | |
| download | mu-8f256f1f2ee6a2a49816dd23d26cd120f526bf0b.tar.gz | |
6090 - new instruction: multiply by immediate
This is a 3-operand instruction: r32 = rm32 * imm32 It looks like https://c9x.me/x86/html/file_module_x86_id_138.html has a bug, implying the same opcode supports a 2-operand version. I don't see that in the Intel manual pdf, or at alternative sites like https://www.felixcloutier.com/x86/imul Native runs seem to validate my understanding. In the process I also fixed a bug in the existing multiply instruction 0f af: the only flags it sets are OF and CF. The other existing multiply instruction f7 was doing things right.
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