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| author | Richard Sandiford <richard.sandiford@linaro.org> | 2017-08-30 11:11:42 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2017-08-30 11:11:42 +0000 |
| commit | 6b9c3decc38f6f852adf16951b9b1b043112cd1c (patch) | |
| tree | e5f94df609e868850d97acfc272b72bc5ed4ed4b /gcc/recog.c | |
| parent | 7c61657f68cc45bdbbfcfd762dbfd7021f3acb3f (diff) | |
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[26/77] Use is_a <scalar_int_mode> in subreg/extract simplifications
This patch adds is_a <scalar_int_mode> checks to various places that
were optimising subregs or extractions in ways that only made sense
for scalar integers. Often the subreg transformations were looking
for extends, truncates or shifts and trying to remove the subreg, which
wouldn't be correct if the SUBREG_REG was a vector rather than a scalar.
The simplify_binary_operation_1 part also removes a redundant:
GET_MODE (opleft) == GET_MODE (XEXP (opright, 0))
since this must be true for:
(ior A (lshifrt B ...)) A == opleft, B == XEXP (opright, 0)
2017-08-30 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
gcc/
* combine.c (find_split_point): Add is_a <scalar_int_mode> checks.
(make_compound_operation_int): Likewise.
(change_zero_ext): Likewise.
* expr.c (convert_move): Likewise.
(convert_modes): Likewise.
* fwprop.c (forward_propagate_subreg): Likewise.
* loop-iv.c (get_biv_step_1): Likewise.
* optabs.c (widen_operand): Likewise.
* postreload.c (move2add_valid_value_p): Likewise.
* recog.c (simplify_while_replacing): Likewise.
* simplify-rtx.c (simplify_unary_operation_1): Likewise.
(simplify_binary_operation_1): Likewise. Remove redundant
mode equality check.
Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r251478
Diffstat (limited to 'gcc/recog.c')
| -rw-r--r-- | gcc/recog.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/gcc/recog.c b/gcc/recog.c index 4467bf7..15476db 100644 --- a/gcc/recog.c +++ b/gcc/recog.c @@ -560,6 +560,7 @@ simplify_while_replacing (rtx *loc, rtx to, rtx_insn *object, rtx x = *loc; enum rtx_code code = GET_CODE (x); rtx new_rtx = NULL_RTX; + scalar_int_mode is_mode; if (SWAPPABLE_OPERANDS_P (x) && swap_commutative_operands_p (XEXP (x, 0), XEXP (x, 1))) @@ -655,6 +656,7 @@ simplify_while_replacing (rtx *loc, rtx to, rtx_insn *object, happen, we might just fail in some cases). */ if (MEM_P (XEXP (x, 0)) + && is_a <scalar_int_mode> (GET_MODE (XEXP (x, 0)), &is_mode) && CONST_INT_P (XEXP (x, 1)) && CONST_INT_P (XEXP (x, 2)) && !mode_dependent_address_p (XEXP (XEXP (x, 0), 0), @@ -662,7 +664,6 @@ simplify_while_replacing (rtx *loc, rtx to, rtx_insn *object, && !MEM_VOLATILE_P (XEXP (x, 0))) { machine_mode wanted_mode = VOIDmode; - machine_mode is_mode = GET_MODE (XEXP (x, 0)); int pos = INTVAL (XEXP (x, 2)); if (GET_CODE (x) == ZERO_EXTRACT && targetm.have_extzv ()) |