On Wed, Mar 29, 2023 at 9:55 AM Pan Li via Gcc-patches
<[email protected]> wrote:
>
> From: Pan Li <[email protected]>
>
> In most architecture the precision_size of vbool*_t types are caculated
> like as the multiple of the type size. For example:
> precision_size = type_size * 8 (aka, bit count per bytes).
>
> Unfortunately, some architecture like RISC-V will adjust the precision_size
> for the vbool*_t in order to align the ISA. For example as below.
> type_size = [1, 1, 1, 1, 2, 4, 8]
> precision_size = [1, 2, 4, 8, 16, 32, 64]
>
> Then the precision_size of RISC-V vbool*_t will not be the multiple of the
> type_size. This PATCH try to enrich this case when comparing the vn_reference.
>
> Given we have the below code:
> void test_vbool8_then_vbool16(int8_t * restrict in, int8_t * restrict out) {
> vbool8_t v1 = *(vbool8_t*)in;
> vbool16_t v2 = *(vbool16_t*)in;
>
> *(vbool8_t*)(out + 100) = v1;
> *(vbool16_t*)(out + 200) = v2;
> }
>
> Before this PATCH:
> csrr t0,vlenb
> slli t1,t0,1
> csrr a3,vlenb
> sub sp,sp,t1
> slli a4,a3,1
> add a4,a4,sp
> addi a2,a1,100
> vsetvli a5,zero,e8,m1,ta,ma
> sub a3,a4,a3
> vlm.v v24,0(a0)
> vsm.v v24,0(a2)
> vsm.v v24,0(a3)
> addi a1,a1,200
> csrr t0,vlenb
> vsetvli a4,zero,e8,mf2,ta,ma
> slli t1,t0,1
> vlm.v v24,0(a3)
> vsm.v v24,0(a1)
> add sp,sp,t1
> jr ra
>
> After this PATCH:
> addi a3,a1,100
> vsetvli a4,zero,e8,m1,ta,ma
> addi a1,a1,200
> vlm.v v24,0(a0)
> vsm.v v24,0(a3)
> vsetvli a5,zero,e8,mf2,ta,ma
> vlm.v v24,0(a0)
> vsm.v v24,0(a1)
> ret
>
> PR 109272
>
> gcc/ChangeLog:
>
> * tree-ssa-sccvn.cc (vn_reference_eq):
>
> gcc/testsuite/ChangeLog:
>
> * gcc.target/riscv/rvv/base/pr108185-4.c:
> * gcc.target/riscv/rvv/base/pr108185-5.c:
> * gcc.target/riscv/rvv/base/pr108185-6.c:
> ---
> .../gcc.target/riscv/rvv/base/pr108185-4.c | 2 +-
> .../gcc.target/riscv/rvv/base/pr108185-5.c | 2 +-
> .../gcc.target/riscv/rvv/base/pr108185-6.c | 2 +-
> gcc/tree-ssa-sccvn.cc | 13 +++++++++++++
> 4 files changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-4.c
> b/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-4.c
> index ea3c360d756..e70284fada8 100644
> --- a/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-4.c
> +++ b/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-4.c
> @@ -65,4 +65,4 @@ test_vbool8_then_vbool64(int8_t * restrict in, int8_t *
> restrict out) {
> /* { dg-final { scan-assembler-times
> {vsetvli\s+[a-x][0-9]+,\s*zero,\s*e8,\s*mf4,\s*ta,\s*ma} 1 } } */
> /* { dg-final { scan-assembler-times
> {vsetvli\s+[a-x][0-9]+,\s*zero,\s*e8,\s*mf8,\s*ta,\s*ma} 1 } } */
> /* { dg-final { scan-assembler-times {vlm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 12 } } */
> -/* { dg-final { scan-assembler-times {vsm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 15 } } */
> +/* { dg-final { scan-assembler-times {vsm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 12 } } */
> diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-5.c
> b/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-5.c
> index 9fc659d2402..575a7842cdf 100644
> --- a/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-5.c
> +++ b/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-5.c
> @@ -65,4 +65,4 @@ test_vbool16_then_vbool64(int8_t * restrict in, int8_t *
> restrict out) {
> /* { dg-final { scan-assembler-times
> {vsetvli\s+[a-x][0-9]+,\s*zero,\s*e8,\s*mf4,\s*ta,\s*ma} 1 } } */
> /* { dg-final { scan-assembler-times
> {vsetvli\s+[a-x][0-9]+,\s*zero,\s*e8,\s*mf8,\s*ta,\s*ma} 1 } } */
> /* { dg-final { scan-assembler-times {vlm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 12 } } */
> -/* { dg-final { scan-assembler-times {vsm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 14 } } */
> +/* { dg-final { scan-assembler-times {vsm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 12 } } */
> diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-6.c
> b/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-6.c
> index 98275e5267d..95a11d37016 100644
> --- a/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-6.c
> +++ b/gcc/testsuite/gcc.target/riscv/rvv/base/pr108185-6.c
> @@ -65,4 +65,4 @@ test_vbool32_then_vbool64(int8_t * restrict in, int8_t *
> restrict out) {
> /* { dg-final { scan-assembler-times
> {vsetvli\s+[a-x][0-9]+,\s*zero,\s*e8,\s*mf2,\s*ta,\s*ma} 1 } } */
> /* { dg-final { scan-assembler-times
> {vsetvli\s+[a-x][0-9]+,\s*zero,\s*e8,\s*mf8,\s*ta,\s*ma} 1 } } */
> /* { dg-final { scan-assembler-times {vlm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 12 } } */
> -/* { dg-final { scan-assembler-times {vsm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 13 } } */
> +/* { dg-final { scan-assembler-times {vsm\.v\s+v[0-9]+,\s*0\([a-x][0-9]+\)}
> 12 } } */
> diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
> index 6b8d38b270c..c6dfa8fd9a3 100644
> --- a/gcc/tree-ssa-sccvn.cc
> +++ b/gcc/tree-ssa-sccvn.cc
> @@ -799,6 +799,19 @@ vn_reference_eq (const_vn_reference_t const vr1,
> const_vn_reference_t const vr2)
> && (TYPE_PRECISION (vr2->type)
> != TREE_INT_CST_LOW (TYPE_SIZE (vr2->type))))
> return false;
> + else if (VECTOR_BOOLEAN_TYPE_P (vr1->type)
> + && VECTOR_BOOLEAN_TYPE_P (vr2->type)
> + && expressions_equal_p (TYPE_SIZE (vr1->type),
> + TYPE_SIZE (vr2->type))
> + && TYPE_PRECISION (vr1->type) != TYPE_PRECISION (vr2->type))
> + /* For the vbool*_t types in most architectures, the precision size is
> + caculated as the multiple of the type size. For example,
> + precision_size = type_size * 8 (aka, bit count per bytes).
> + Unfortunately, some architecture like RISC-V will adjust the
> + precision for the vbool*_t in order to align the ISA and the
> + precision will not be the multiple of the type size. Thus, enrich
> + the type comparation for this case here. */
> + return false;
I would prefer if you write it cheaper, like
else if (VECTOR_BOOLEAN_TYPE_P (vr1->type)
&& VECTOR_BOOLEAN_TYPE_P (vr2->type))
{
/* Vector boolean types can have padding, verify we are dealing with
the same number of elements. */
if (TYPE_VECTOR_SUBPARTS (vr1->type) != TYPE_VECTOR_SUBPARTS
(vr2->type))
return false;
}
there is IMHO no reason to compare TYPE_SIZE again.
Richard.
>
> i = 0;
> j = 0;
> --
> 2.34.1
>
