[Bug rtl-optimization/67218] Combine incorrectly folds (double) (float) (unsigned)

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67218

--- Comment #1 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
---
Author: rsandifo
Date: Tue Aug 18 19:04:41 2015
New Revision: 226987

URL: https://gcc.gnu.org/viewcvs?rev=226987&root=gcc&view=rev
Log:
gcc/
        PR rtl-optimization/67218
        * simplify-rtx.c (exact_int_to_float_conversion_p): New function.
        (simplify_unary_operation_1): Use it.

gcc/testsuite/
        PR rtl-optimization/67218
        * gcc.c-torture/execute/ieee/pr67218.c,
        gcc.target/aarch64/fcvt_int_float_double1.c,
        gcc.target/aarch64/fcvt_int_float_double2.c,
        gcc.target/aarch64/fcvt_int_float_double3.c,
        gcc.target/aarch64/fcvt_int_float_double4.c,
        gcc.target/aarch64/fcvt_uint_float_double1.c,
        gcc.target/aarch64/fcvt_uint_float_double2.c,
        gcc.target/aarch64/fcvt_uint_float_double3.c,
        gcc.target/aarch64/fcvt_uint_float_double4.c: New tests.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/ieee/pr67218.c
    trunk/gcc/testsuite/gcc.target/aarch64/fcvt_int_float_double1.c
    trunk/gcc/testsuite/gcc.target/aarch64/fcvt_int_float_double2.c
    trunk/gcc/testsuite/gcc.target/aarch64/fcvt_int_float_double3.c
    trunk/gcc/testsuite/gcc.target/aarch64/fcvt_int_float_double4.c
    trunk/gcc/testsuite/gcc.target/aarch64/fcvt_uint_float_double1.c
    trunk/gcc/testsuite/gcc.target/aarch64/fcvt_uint_float_double2.c
    trunk/gcc/testsuite/gcc.target/aarch64/fcvt_uint_float_double3.c
    trunk/gcc/testsuite/gcc.target/aarch64/fcvt_uint_float_double4.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/simplify-rtx.c
    trunk/gcc/testsuite/ChangeLog