Jakub Jelinek <ja...@redhat.com> writes:
> --- gcc/config/aarch64/aarch64.md.jj 2021-04-15 10:45:02.798853095 +0200
> +++ gcc/config/aarch64/aarch64.md 2021-04-15 13:28:04.734754364 +0200
> @@ -3572,6 +3572,18 @@ (define_insn "*neg_<shift>_si2_uxtw"
> [(set_attr "autodetect_type" "alu_shift_<shift>_op2")]
> )
>
> +(define_insn "*neg_asr_si2_extr"
> + [(set (match_operand:SI 0 "register_operand" "r")
> + (neg:SI (match_operator 4 "subreg_lowpart_operator"
Very minor, but it might be better to have the :SI on the match_operator
too, like in the pattern below.
> + [(sign_extract:DI
> + (match_operand:DI 1 "register_operand" "r")
> + (match_operand 3 "aarch64_simd_shift_imm_offset_si" "n")
> + (match_operand 2 "aarch64_simd_shift_imm_offset_si"
> "n"))])))]
> + "INTVAL (operands[2]) + INTVAL (operands[3]) == 32"
> + "neg\\t%w0, %w1, asr %2"
> + [(set_attr "autodetect_type" "alu_shift_asr_op2")]
> +)
> +
> (define_insn "mul<mode>3"
> [(set (match_operand:GPI 0 "register_operand" "=r")
> (mult:GPI (match_operand:GPI 1 "register_operand" "r")
> @@ -5382,6 +5394,22 @@ (define_insn "*extrsi5_insn_uxtw_alt"
> "extr\\t%w0, %w1, %w2, %4"
> [(set_attr "type" "rotate_imm")]
> )
> +
> +(define_insn "*extrsi5_insn_di"
> + [(set (match_operand:SI 0 "register_operand" "=r")
> + (ior:SI (ashift:SI (match_operand:SI 1 "register_operand" "r")
> + (match_operand 3 "const_int_operand" "n"))
> + (match_operator:SI 6 "subreg_lowpart_operator"
> + [(zero_extract:DI
> + (match_operand:DI 2 "register_operand" "r")
> + (match_operand 5 "const_int_operand" "n")
> + (match_operand 4 "const_int_operand" "n"))])))]
> + "UINTVAL (operands[3]) < 32
> + && UINTVAL (operands[3]) + UINTVAL (operands[4]) == 32
> + && UINTVAL (operands[4]) + UINTVAL (operands[5]) - 32 <= 64"
Could you explain this condition? With operand 5 being the size
and operand 4 being the position, I was expecting something like:
"UINTVAL (operands[3]) < 32
&& UINTVAL (operands[3]) == UINTVAL (operands[5])
&& UINTVAL (operands[4]) + UINTVAL (operands[5]) == 32"
i.e. the %w1 shift must equal the size of the %w2 extraction
and the %w2 extraction must align with the top of the register.
Or, writing it in more the style of the original condition,
the final line would be:
&& UINTVAL (operands[3]) == UINTVAL (operands[5])"
instead of:
&& UINTVAL (operands[4]) + UINTVAL (operands[5]) - 32 <= 64"
Not tested though, and it's late, so I could have got that completely
wrong :-)
Thanks,
Richard
> + "extr\\t%w0, %w1, %w2, %4"
> + [(set_attr "type" "rotate_imm")]
> +)
>
> (define_insn "*ror<mode>3_insn"
> [(set (match_operand:GPI 0 "register_operand" "=r")
> --- gcc/testsuite/gcc.target/aarch64/pr100075.c.jj 2021-04-15
> 13:23:31.188852983 +0200
> +++ gcc/testsuite/gcc.target/aarch64/pr100075.c 2021-04-15
> 13:23:10.612086048 +0200
> @@ -0,0 +1,20 @@
> +/* PR target/100075 */
> +/* { dg-do compile } */
> +/* { dg-options "-O2" } */
> +/* { dg-final { scan-assembler-not {\tsbfx\tx[0-9]+, x[0-9]+, 16, 16} } } */
> +/* { dg-final { scan-assembler {\tneg\tw[0-9]+, w[0-9]+, asr 16} } } */
> +/* { dg-final { scan-assembler {\textr\tw[0-9]+, w[0-9]+, w[0-9]+, 16} } } */
> +
> +struct S { short x, y; };
> +
> +struct S
> +f1 (struct S p)
> +{
> + return (struct S) { -p.y, p.x };
> +}
> +
> +struct S
> +f2 (struct S p)
> +{
> + return (struct S) { p.y, -p.x };
> +}
>
> Jakub
