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| author | Richard Kenner <kenner@gcc.gnu.org> | 1992-08-29 22:39:51 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1992-08-29 22:39:51 -0400 |
| commit | 4a96984737a74d730d1775f9e2e84046dec9fab7 (patch) | |
| tree | 0ce154b2429acd6ec8711b2556c17ceb159130ae /gcc/optabs.c | |
| parent | 803090c4274d6ab45674cd94dda7b899aea10b33 (diff) | |
| download | gcc-4a96984737a74d730d1775f9e2e84046dec9fab7.tar.gz | |
(expand_{binop,unop}): Don't make invalid paradoxical SUBREGs.
From-SVN: r1995
Diffstat (limited to 'gcc/optabs.c')
| -rw-r--r-- | gcc/optabs.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index 7b883cbccb6..7af1c416671 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -454,14 +454,17 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods) /* For certain integer operations, we need not actually extend the narrow operands, as long as we will truncate - the results to the same narrowness. */ + the results to the same narrowness. Don't do this when + WIDER_MODE is wider than a word since a paradoxical SUBREG + isn't valid for such modes. */ if ((binoptab == ior_optab || binoptab == and_optab || binoptab == xor_optab || binoptab == add_optab || binoptab == sub_optab || binoptab == smul_optab || binoptab == ashl_optab || binoptab == lshl_optab) - && class == MODE_INT) + && class == MODE_INT + && GET_MODE_SIZE (wider_mode) <= UNITS_PER_WORD) no_extend = 1; /* If an operand is a constant integer, we might as well @@ -879,14 +882,17 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods) /* For certain integer operations, we need not actually extend the narrow operands, as long as we will truncate - the results to the same narrowness. */ + the results to the same narrowness. Don't do this when + WIDER_MODE is wider than a word since a paradoxical SUBREG + isn't valid for such modes. */ if ((binoptab == ior_optab || binoptab == and_optab || binoptab == xor_optab || binoptab == add_optab || binoptab == sub_optab || binoptab == smul_optab || binoptab == ashl_optab || binoptab == lshl_optab) - && class == MODE_INT) + && class == MODE_INT + && GET_MODE_SIZE (wider_mode) <= UNITS_PER_WORD) no_extend = 1; /* If an operand is a constant integer, we might as well @@ -1207,6 +1213,7 @@ expand_unop (mode, unoptab, op0, target, unsignedp) results to the same narrowness. */ if ((unoptab == neg_optab || unoptab == one_cmpl_optab) + && GET_MODE_SIZE (wider_mode) <= UNITS_PER_WORD && class == MODE_INT) xop0 = gen_rtx (SUBREG, wider_mode, force_reg (mode, xop0), 0); else @@ -1304,6 +1311,7 @@ expand_unop (mode, unoptab, op0, target, unsignedp) results to the same narrowness. */ if ((unoptab == neg_optab || unoptab == one_cmpl_optab) + && GET_MODE_SIZE (wider_mode) <= UNITS_PER_WORD && class == MODE_INT) xop0 = gen_rtx (SUBREG, wider_mode, force_reg (mode, xop0), 0); else |