cmd/compile: stop using fucomi* ops for 387 builds
The fucomi* opcodes were only introduced for the Pentium Pro. They do not exist for an MMX Pentium. Use the fucom* instructions instead and move the condition codes from the fp flags register to the integer flags register explicitly. The use of fucomi* opcodes in ggen.go was introduced in 1.5 (CL 8738). The bad ops were generated for 64-bit floating-point comparisons. The use of fucomi* opcodes in gsubr.go dates back to at least 1.1. The bad ops were generated for float{32,64} to uint64 conversions. Fixes #13923 Change-Id: I5290599f5edea8abf8fb18036f44fa78bd1fc9e6 Reviewed-on: https://go-review.googlesource.com/18590Reviewed-by:Minux Ma <minux@golang.org> Reviewed-by:
Russ Cox <rsc@golang.org>
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