FP compares and TARGET_SSE_MATH

[Uros Bizjak]

Hello!

I would like to ask about FP compares and TARGET_SSE_MATH. Currently, 
SSE compares are enabled for TARGET_SSE, but user has no choice on which 
instruction set to use. In pentium4 case, resulting ASM code is a 
mixture of i387 compares, SSE compares and a lot of register moving to 
satisfy register constraints of used insns. I suggest to limit SSE 
compares to TARGET_SSE_MATH.

By limiting SSE compares to TARGET_SSE_MATH, two insn sets would be 
separated. If someone still wants to use mixed insn set, one can use 
TARGET_MIX_SSE_I387 switch. Similar reasoning applies to FP conditional 
move patterns and min/max patterns.

Uros.