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| author | Richard Kenner <kenner@vlsi1.ultra.nyu.edu> | 2001-02-06 12:39:15 +0000 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 2001-02-06 07:39:15 -0500 |
| commit | d14057222fec681710cd1b1ac1d47478c0466bfb (patch) | |
| tree | ef948bedc788321fdca09d6b2f508f386ee213d9 /gcc/explow.c | |
| parent | a87b4257946d4453f250585aa22adc4f70db1165 (diff) | |
| download | gcc-d14057222fec681710cd1b1ac1d47478c0466bfb.tar.gz | |
combine.c (nonzero_bits, case PLUS): If pointers extend unsigned and this is the sum of a pointer and a constant...
* combine.c (nonzero_bits, case PLUS): If pointers extend unsigned
and this is the sum of a pointer and a constant, we know the result
did not overflow.
(num_sign_bit_copies, case PLUS): Likewise.
* explow.c (convert_memory_address): Remove opposite SUBREG.
* function.c (instantiate_new_reg): New function (from common code).
(instantiate_virtual_regs_1): Call it.
For PLUS, handle if (plus (subreg (virt-reg) (const_int))
if pointers sign- or zero-extend.
* simplify-rtx.c (simplify_unary_operation, case ZERO_EXTEND):
If pointers extend unsigned, use inside of SUBREG.
(simplify_unary_operation, case SIGN_EXTEND): Likewise, if sign extend.
From-SVN: r39489
Diffstat (limited to 'gcc/explow.c')
| -rw-r--r-- | gcc/explow.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/explow.c b/gcc/explow.c index d36ceffa440..b7c0bb9f6d9 100644 --- a/gcc/explow.c +++ b/gcc/explow.c @@ -386,6 +386,11 @@ convert_memory_address (to_mode, x) case CONST_DOUBLE: return x; + case SUBREG: + if (GET_MODE (SUBREG_REG (x)) == to_mode) + return SUBREG_REG (x); + break; + case LABEL_REF: temp = gen_rtx_LABEL_REF (to_mode, XEXP (x, 0)); LABEL_REF_NONLOCAL_P (temp) = LABEL_REF_NONLOCAL_P (x); |