On 04/08/18 21:35, Luc Van Oostenryck wrote:
> Convert the OP_TRUNC into an OP_AND with the appropriate mask.
> This a greater chance to simplify with previous instructions
> and to correspond to a register-size operand.
>
> Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
> ---
> simplify.c | 17 +++++++++++++++++
> validation/optim/trunc-setne0.c | 1 -
> 2 files changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/simplify.c b/simplify.c
> index ae53e7ae7..911bfde7e 100644
> --- a/simplify.c
> +++ b/simplify.c
> @@ -690,6 +690,7 @@ static int simplify_seteq_setne(struct instruction *insn, long long value)
> {
> pseudo_t old = insn->src1;
> struct instruction *def;
> + unsigned osize;
> int inverse;
> int opcode;
>
> @@ -749,6 +750,22 @@ static int simplify_seteq_setne(struct instruction *insn, long long value)
> // setne.1 %s <- %a, $0
> // and same for setne/eq ... 0/1
> return replace_pseudo(insn, &insn->src1, def->src);
> + case OP_TRUNC:
> + if (nbr_users(old) > 1)
> + break;
> + // convert
> + // trunc.n %s <- (o) %a
> + // setne.m %r <- %s, $0
> + // into:
> + // and.o %s <- %a, $((1 << o) - 1)
> + // setne.m %r <- %a, $0
s/%a/%s/ ?
ATB,
Ramsay Jones
> + // and same for setne/eq ... 0/1
> + osize = def->size;
> + def->opcode = OP_AND;
> + def->type = def->orig_type;
> + def->size = def->type->bit_size;
> + def->src2 = value_pseudo(bits_mask(osize));
> + return REPEAT_CSE;
> }
> return 0;
> }
> diff --git a/validation/optim/trunc-setne0.c b/validation/optim/trunc-setne0.c
> index 16f99a88c..878c05fa6 100644
> --- a/validation/optim/trunc-setne0.c
> +++ b/validation/optim/trunc-setne0.c
> @@ -13,7 +13,6 @@ unsigned int foo(struct s x)
> /*
> * check-name: trunc-setne0
> * check-command: test-linearize -Wno-decl $file
> - * check-known-to-fail
> *
> * check-output-ignore
> * check-output-contains: and\\.
>
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