Thirty years ago there was the PowerPC 615 which included an x86 core. It was even pin-compatible with the Intel Pentium: ”The "PowerPC 615" is a PowerPC proce

Thirty years ago there was the PowerPC 615 which included an x86 core. It was even pin-compatible with the Intel Pentium: ”The "PowerPC 615" is a PowerPC processor announced by IBM in 1994, but which never reached mass production. Its main feature was to incorporate an x86 core on die, thus making the processor able to natively process both PowerPC and x86 instructions.[37] An operating system running on PowerPC 615 could either choose to execute 32-bit or 64-bit PowerPC instructions, 32-bit x86 instructions or a mix of three. Mixing instructions would involve a context switch in the CPU with a small overhead. The only operating systems that supported the 615 were Minix and a special development version of OS/2.” ”was 330 mm2 large and manufactured by IBM on a 0.35 μm process. It was pin compatible with Intel's Pentium processors and comparable in speed. The processor was introduced only as a prototype and the program was killed in part by the fact that Microsoft never supported the processor.” https://en.m.wikipedia.org/wiki/PowerPC_600 https://en.m.wikipedia.org/wiki/PowerPC_600 I believe IBM had an x86 license from Intel (back from the original PC days) which allowed them to do this.