[PATCH, i386] Unify TARGET_SSE_MATH for trunc* patterns

[Uros Bizjak]

Richard Henderson wrote:

>(define_expand "truncdfsf2"
>  [(set (match_operand:SF 0 "nonimmediate_operand" "")
>	(float_truncate:SF
>	  (match_operand:DF 1 "nonimmediate_operand" "")))]
>  "TARGET_80387 || (TARGET_SSE2 && TARGET_SSE_MATH)"
>{
>  if (MEM_P (operands[0]) && MEM_P (operands[1]))
>    operands[1] = force_reg (DFmode, operands[1]);
>
>  
>
If truncdfsf2 is defined this way, following tests break:

Running target unix
FAIL: gcc.c-torture/execute/gofast.c compilation,  -O0
UNRESOLVED: gcc.c-torture/execute/gofast.c execution,  -O0
FAIL: gcc.dg/compat/struct-by-value-10 c_compat_y_tst.o compile
UNRESOLVED: gcc.dg/compat/struct-by-value-10 
c_compat_x_tst.o-c_compat_y_tst.o link
UNRESOLVED: gcc.dg/compat/struct-by-value-10 
c_compat_x_tst.o-c_compat_y_tst.o execute
FAIL: gcc.dg/compat/struct-return-10 c_compat_y_tst.o compile
UNRESOLVED: gcc.dg/compat/struct-return-10 
c_compat_x_tst.o-c_compat_y_tst.o link
UNRESOLVED: gcc.dg/compat/struct-return-10 
c_compat_x_tst.o-c_compat_y_tst.o execute
FAIL: gcc.dg/debug/dwarf2/dwarf-die7.c scan-assembler 1.*DW_AT_inline
FAIL: gcc.dg/builtins-43.c (test for excess errors)
FAIL: gcc.dg/complete-port.c (test for excess errors)
FAIL: gcc.dg/pr18596-1.c (test for excess errors)

Failing testcases are fixed if truncdfsf2 is reverted back to:

(define_expand "truncdfsf2"
  [(parallel [(set (match_operand:SF 0 "nonimmediate_operand" "")
           (float_truncate:SF
            (match_operand:DF 1 "register_operand" "")))
          (clobber (match_dup 2))])]
  "TARGET_80387 || (TARGET_SSE2 && TARGET_SSE_MATH)"
  "
   if (TARGET_SSE2 && TARGET_SSE_MATH)
     {
    emit_insn (gen_truncdfsf2_sse (operands[0], operands[1]));
    DONE;
     }
   else if (flag_unsafe_math_optimizations)
     {
    rtx reg = REG_P (operands[0]) ? operands[0] : gen_reg_rtx (SFmode);
    emit_insn (gen_truncdfsf2_i387_noop (reg, operands[1]));
    if (reg != operands[0])
      emit_move_insn (operands[0], reg);
    DONE;
     }
   else
     operands[2] = assign_386_stack_local (SFmode, 0);
")

Uros.