Match: Support form 2 for the .SAT_TRUNC

This patch would like to add form 2 support for the .SAT_TRUNC.  Aka:

Form 2:
  #define DEF_SAT_U_TRUC_FMT_2(NT, WT)     \
  NT __attribute__((noinline))             \
  sat_u_truc_##WT##_to_##NT##_fmt_2 (WT x) \
  {                                        \
    bool overflow = x > (WT)(NT)(-1);      \
    return overflow ? (NT)-1 : (NT)x;      \
  }

DEF_SAT_U_TRUC_FMT_2(uint32, uint64)

Before this patch:
   3   │
   4   │ __attribute__((noinline))
   5   │ uint32_t sat_u_truc_uint64_t_to_uint32_t_fmt_2 (uint64_t x)
   6   │ {
   7   │   uint32_t _1;
   8   │   long unsigned int _3;
   9   │
  10   │ ;;   basic block 2, loop depth 0
  11   │ ;;    pred:       ENTRY
  12   │   _3 = MIN_EXPR <x_2(D), 4294967295>;
  13   │   _1 = (uint32_t) _3;
  14   │   return _1;
  15   │ ;;    succ:       EXIT
  16   │
  17   │ }

After this patch:
   3   │
   4   │ __attribute__((noinline))
   5   │ uint32_t sat_u_truc_uint64_t_to_uint32_t_fmt_2 (uint64_t x)
   6   │ {
   7   │   uint32_t _1;
   8   │
   9   │ ;;   basic block 2, loop depth 0
  10   │ ;;    pred:       ENTRY
  11   │   _1 = .SAT_TRUNC (x_2(D)); [tail call]
  12   │   return _1;
  13   │ ;;    succ:       EXIT
  14   │
  15   │ }

The below test suites are passed for this patch:
1. The x86 bootstrap test.
2. The x86 fully regression test.
3. The rv64gcv fully regresssion test.

gcc/ChangeLog:

	* match.pd: Add form 2 for .SAT_TRUNC.
	* tree-ssa-math-opts.cc (math_opts_dom_walker::after_dom_children):
	Add new case NOP_EXPR,  and try to match SAT_TRUNC.

Signed-off-by: Pan Li <pan2.li@intel.com>

0 files changed, 0 insertions, 0 deletions