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* reg-stack.c (get_true_reg): Handle FLOAT_TRUNCATE like FLOAT_EXTEND if flag_unsafe_math_optimizations. * config/i386/i386.md (truncdfsf2): If flag_unsafe_math_optimizations and TARGET_80387 expand using truncdfsf2_noop pattern. (truncxfsf2): Likewise using truncxfsf2_noop. (truncxfdf2): Likewise using truncxfdf2_noop. (truncdfsf2_noop, truncxfsf2_noop, truncxfdf2_noop): New patterns. From-SVN: r79893
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