diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 10 | ||||
| -rw-r--r-- | gcc/combine.c | 36 |
2 files changed, 37 insertions, 9 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8e73d81e145..c1141eb8e4e 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,13 @@ +Sun Jan 7 14:35:13 MET 2001 Jan Hubicka <jh@suse.cz> + + * combine.c (combine_simplify_rtx): Recognize the unordered compares. + (nonzero_bits): Likewise. + (simplify_comparison): Likewise. + (num_sign_bit_copies): Likewise; return more sane value depending + on STORE_FLAG_VALUE. + (known_cond): Do not assume EQ to be always true for equivalent + operands. + Sun Jan 7 14:31:57 MET 2001 Jan Hubicka <jh@suse.cz> * cse.c (fold_rtx): Handle unordered comparisons. diff --git a/gcc/combine.c b/gcc/combine.c index 23a31eda05d..b8a2e043ac0 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -4329,6 +4329,10 @@ combine_simplify_rtx (x, op0_mode, last, in_dest) case EQ: case NE: case GT: case GTU: case GE: case GEU: case LT: case LTU: case LE: case LEU: + case UNEQ: case LTGT: + case UNGT: case UNGE: + case UNLT: case UNLE: + case UNORDERED: case ORDERED: /* If the first operand is a condition code, we can't do anything with it. */ if (GET_CODE (XEXP (x, 0)) == COMPARE @@ -7488,7 +7492,9 @@ known_cond (x, cond, reg, val) if (side_effects_p (x)) return x; - if (cond == EQ && rtx_equal_p (x, reg)) + if (cond == EQ && rtx_equal_p (x, reg) && !FLOAT_MODE_P (cond)) + return val; + if (cond == UNEQ && rtx_equal_p (x, reg)) return val; /* If X is (abs REG) and we know something about REG's relationship @@ -8119,10 +8125,12 @@ nonzero_bits (x, mode) break; case EQ: case NE: - case GT: case GTU: - case LT: case LTU: - case GE: case GEU: - case LE: case LEU: + case UNEQ: case LTGT: + case GT: case GTU: case UNGT: + case LT: case LTU: case UNLT: + case GE: case GEU: case UNGE: + case LE: case LEU: case UNLE: + case UNORDERED: case ORDERED: /* If this produces an integer result, we know which bits are set. Code here used to clear bits outside the mode of X, but that is @@ -8696,9 +8704,17 @@ num_sign_bit_copies (x, mode) return MIN (num0, num1); case EQ: case NE: case GE: case GT: case LE: case LT: + case UNEQ: case LTGT: case UNGE: case UNGT: case UNLE: case UNLT: case GEU: case GTU: case LEU: case LTU: - if (STORE_FLAG_VALUE == -1) - return bitwidth; + case UNORDERED: case ORDERED: + /* If the constant is negative, take its 1's complement and remask. + Then see how many zero bits we have. */ + nonzero = STORE_FLAG_VALUE; + if (bitwidth <= HOST_BITS_PER_WIDE_INT + && (nonzero & ((HOST_WIDE_INT) 1 << (bitwidth - 1))) != 0) + nonzero = (~nonzero) & GET_MODE_MASK (mode); + + return (nonzero == 0 ? bitwidth : bitwidth - floor_log2 (nonzero) - 1); break; default: @@ -10668,8 +10684,10 @@ simplify_comparison (code, pop0, pop1) break; case EQ: case NE: - case LT: case LTU: case LE: case LEU: - case GT: case GTU: case GE: case GEU: + case UNEQ: case LTGT: + case LT: case LTU: case UNLT: case LE: case LEU: case UNLE: + case GT: case GTU: case UNGT: case GE: case GEU: case UNGE: + case UNORDERED: case ORDERED: /* We can't do anything if OP0 is a condition code value, rather than an actual data value. */ if (const_op != 0 |
