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From: Nicholas N. <nj...@cs...> - 2008-10-12 19:26:15
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On Tue, 7 Oct 2008, Michael Poole wrote: > The e500 SPE unit is obnoxious to software on a number of levels: it > reuses AltiVec instruction space; it widens the GPRs (R0-R31) to 64 > bits to use them as 64-bit-integer/64-bit-float/SIMD-32-bit-float-pair > operands; it hijacks the AltiVec exception bit in the Machine Status > Register to enable accesses to the top halves of the 64-bit-wide > registers; *and* FreeScale says restrict it to libraries and device > drivers because SPE will go away in future chips. Wow. That is obnoxious. N |