diff options
Diffstat (limited to 'gcc/config/i386/i386-expand.cc')
| -rw-r--r-- | gcc/config/i386/i386-expand.cc | 86 |
1 files changed, 81 insertions, 5 deletions
diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc index 2e0d12c..9c92b07 100644 --- a/gcc/config/i386/i386-expand.cc +++ b/gcc/config/i386/i386-expand.cc @@ -4510,15 +4510,86 @@ ix86_expand_int_sse_cmp (rtx dest, enum rtx_code code, rtx cop0, rtx cop1, case GTU: break; - case NE: case LE: case LEU: + /* x <= cst can be handled as x < cst + 1 unless there is + wrap around in cst + 1. */ + if (GET_CODE (cop1) == CONST_VECTOR + && GET_MODE_INNER (mode) != TImode) + { + unsigned int n_elts = GET_MODE_NUNITS (mode), i; + machine_mode eltmode = GET_MODE_INNER (mode); + for (i = 0; i < n_elts; ++i) + { + rtx elt = CONST_VECTOR_ELT (cop1, i); + if (!CONST_INT_P (elt)) + break; + if (code == GE) + { + /* For LE punt if some element is signed maximum. */ + if ((INTVAL (elt) & (GET_MODE_MASK (eltmode) >> 1)) + == (GET_MODE_MASK (eltmode) >> 1)) + break; + } + /* For LEU punt if some element is unsigned maximum. */ + else if (elt == constm1_rtx) + break; + } + if (i == n_elts) + { + rtvec v = rtvec_alloc (n_elts); + for (i = 0; i < n_elts; ++i) + RTVEC_ELT (v, i) + = GEN_INT (INTVAL (CONST_VECTOR_ELT (cop1, i)) + 1); + cop1 = gen_rtx_CONST_VECTOR (mode, v); + std::swap (cop0, cop1); + code = code == LE ? GT : GTU; + break; + } + } + /* FALLTHRU */ + case NE: code = reverse_condition (code); *negate = true; break; case GE: case GEU: + /* x >= cst can be handled as x > cst - 1 unless there is + wrap around in cst - 1. */ + if (GET_CODE (cop1) == CONST_VECTOR + && GET_MODE_INNER (mode) != TImode) + { + unsigned int n_elts = GET_MODE_NUNITS (mode), i; + machine_mode eltmode = GET_MODE_INNER (mode); + for (i = 0; i < n_elts; ++i) + { + rtx elt = CONST_VECTOR_ELT (cop1, i); + if (!CONST_INT_P (elt)) + break; + if (code == GE) + { + /* For GE punt if some element is signed minimum. */ + if (INTVAL (elt) < 0 + && ((INTVAL (elt) & (GET_MODE_MASK (eltmode) >> 1)) + == 0)) + break; + } + /* For GEU punt if some element is zero. */ + else if (elt == const0_rtx) + break; + } + if (i == n_elts) + { + rtvec v = rtvec_alloc (n_elts); + for (i = 0; i < n_elts; ++i) + RTVEC_ELT (v, i) + = GEN_INT (INTVAL (CONST_VECTOR_ELT (cop1, i)) - 1); + cop1 = gen_rtx_CONST_VECTOR (mode, v); + code = code == GE ? GT : GTU; + break; + } + } code = reverse_condition (code); *negate = true; /* FALLTHRU */ @@ -4556,6 +4627,11 @@ ix86_expand_int_sse_cmp (rtx dest, enum rtx_code code, rtx cop0, rtx cop1, } } + if (GET_CODE (cop0) == CONST_VECTOR) + cop0 = force_reg (mode, cop0); + else if (GET_CODE (cop1) == CONST_VECTOR) + cop1 = force_reg (mode, cop1); + rtx optrue = op_true ? op_true : CONSTM1_RTX (data_mode); rtx opfalse = op_false ? op_false : CONST0_RTX (data_mode); if (*negate) @@ -4752,13 +4828,13 @@ ix86_expand_int_sse_cmp (rtx dest, enum rtx_code code, rtx cop0, rtx cop1, if (*negate) std::swap (op_true, op_false); + if (GET_CODE (cop1) == CONST_VECTOR) + cop1 = force_reg (mode, cop1); + /* Allow the comparison to be done in one mode, but the movcc to happen in another mode. */ if (data_mode == mode) - { - x = ix86_expand_sse_cmp (dest, code, cop0, cop1, - op_true, op_false); - } + x = ix86_expand_sse_cmp (dest, code, cop0, cop1, op_true, op_false); else { gcc_assert (GET_MODE_SIZE (data_mode) == GET_MODE_SIZE (mode)); |