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| author | Michael Meissner <meissner@gcc.gnu.org> | 1992-07-23 21:15:35 +0000 |
|---|---|---|
| committer | Michael Meissner <meissner@gcc.gnu.org> | 1992-07-23 21:15:35 +0000 |
| commit | 85f5e2b68d38861a759736546ce55cff62538193 (patch) | |
| tree | e02736bf287e9b87e644b040442e7d9246578c7a /gcc | |
| parent | 5a13dfdd5117158f6783903a77a5c7ab2ea8c7d7 (diff) | |
| download | gcc-85f5e2b68d38861a759736546ce55cff62538193.zip gcc-85f5e2b68d38861a759736546ce55cff62538193.tar.gz gcc-85f5e2b68d38861a759736546ce55cff62538193.tar.bz2 | |
Do not emit insns to compare two constants.
From-SVN: r1677
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/mips/mips.c | 43 |
1 files changed, 39 insertions, 4 deletions
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c index 37707cd..82f31ae 100644 --- a/gcc/config/mips/mips.c +++ b/gcc/config/mips/mips.c @@ -421,7 +421,7 @@ large_int (op, mode) rtx op; enum machine_mode mode; { - long value; + HOST_WIDE_INT value; if (GET_CODE (op) != CONST_INT) return FALSE; @@ -1608,7 +1608,7 @@ gen_int_relational (test_code, result, cmp0, cmp1, p_invert) if ((GET_CODE (cmp0) == REG || GET_CODE (cmp0) == SUBREG) && GET_CODE (cmp1) == CONST_INT) { - int value = INTVAL (cmp1); + HOST_WIDE_INT value = INTVAL (cmp1); rtx truth = (rtx)0; if (test == ITEST_GEU && value == 0) @@ -1675,7 +1675,7 @@ gen_int_relational (test_code, result, cmp0, cmp1, p_invert) if (GET_CODE (cmp1) == CONST_INT) { - int value = INTVAL (cmp1); + HOST_WIDE_INT value = INTVAL (cmp1); if (value < p_info->const_low || value > p_info->const_high) cmp1 = force_reg (SImode, cmp1); } @@ -1833,7 +1833,42 @@ gen_conditional_branch (operands, test_code) } break; } - + + /* Handle always true or always false cases directly */ + if (GET_CODE (cmp0) == CONST_INT && GET_CODE (cmp1) == CONST_INT) + { + HOST_WIDE_INT sval0 = INTVAL (cmp0); + HOST_WIDE_INT sval1 = INTVAL (cmp1); + unsigned long uval0 = sval0; + unsigned long uval1 = sval1; + int truth = 0; + + switch (test_code) + { + default: + goto fail; + + case EQ: truth = (sval0 == sval1); break; + case NE: truth = (sval0 != sval1); break; + case GT: truth = (sval0 > sval1); break; + case GE: truth = (sval0 >= sval1); break; + case LT: truth = (sval0 < sval1); break; + case LE: truth = (sval0 <= sval1); break; + case GTU: truth = (uval0 > uval1); break; + case GEU: truth = (uval0 >= uval1); break; + case LTU: truth = (uval0 < uval1); break; + case LEU: truth = (uval0 <= uval1); break; + } + + if (invert) + truth = ! truth; + + if (truth) + emit_jump_insn (gen_rtx (SET, VOIDmode, pc_rtx, label1)); + + return; + } + /* Generate the jump */ if (invert) { |