On Thu, Jan 28, 2016 at 2:37 PM, Yuri Rumyantsev <ysrum...@gmail.com> wrote:
> Thanks Richard.
>
> Uros,
>
> Could you please review back-end part of this patch?
No problem, but please in future CC me on the x86 patches, so I won't forgot.
+(define_expand "cbranch<mode>4"
+ [(set (reg:CC FLAGS_REG)
+ (compare:CC (match_operand:V48_AVX2 1 "nonimmediate_operand")
+ (match_operand:V48_AVX2 2 "register_operand")))
+
Please swap predicates, operand 1 should be register_operand and
operand 2 nonimmediate operand.
+ (set (pc) (if_then_else
+ (match_operator 0 "bt_comparison_operator"
+ [(reg:CC FLAGS_REG) (const_int 0)])
+ (label_ref (match_operand 3))
+ (pc)))]
+ "TARGET_AVX2"
PTEST was introduced with SSE4_1, I see no reason to limit this
transformation to AVX2. However, since you check MODE_VECTOR_INT in
the expander, it looks that the pattern should only handle integer
modes.
+ /* Handle special case - vector comparsion with boolean result, transform
+ it using ptest instruction. */
+ if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT)
+ {
+ rtx lhs;
No need for the above variable, we will use tmp here.
+ rtx flag;
+ machine_mode p_mode = GET_MODE_SIZE (mode) == 32 ? V4DImode : V2DImode;
space here.
+ gcc_assert (code == EQ || code == NE);
+ if (!REG_P (op0))
+ op0 = force_reg (mode, op0);
+ if (!REG_P (op1))
+ op1 = force_reg (mode, op1);
No need for the above fixups, predicates already did the job.
+ /* Generate subtraction since we can't check that one operand is
+ zero vector. */
+ lhs = gen_reg_rtx (mode);
tmp = ...
+ emit_insn (gen_rtx_SET (lhs, gen_rtx_MINUS (mode, op0, op1)));
Since we are only interested in equality, should we rather use XOR,
since it is commutative operator.
+ lhs = gen_rtx_SUBREG (p_mode, lhs, 0);
tmp = gen_lowpart (p_mode, tmp);
+ tmp = gen_rtx_SET (gen_rtx_REG (CCmode, FLAGS_REG),
+ gen_rtx_UNSPEC (CCmode,
+ gen_rtvec (2, lhs, lhs),
+ UNSPEC_PTEST));
+ emit_insn (tmp);
There is no need for a temporary here, just use
emit_insn (gen_rtx_SET ( ... ) ...
+ tmp = gen_rtx_fmt_ee (code, VOIDmode, flag, const0_rtx);
+ if (code == EQ)
+ tmp = gen_rtx_IF_THEN_ELSE (VOIDmode, tmp,
+ gen_rtx_LABEL_REF (VOIDmode, label), pc_rtx);
+ else
+ tmp = gen_rtx_IF_THEN_ELSE (VOIDmode, tmp,
+ pc_rtx, gen_rtx_LABEL_REF (VOIDmode, label));
+ emit_jump_insn (gen_rtx_SET (pc_rtx, tmp));
+ return;
Oh.... please use something involving std::swap here.
Uros.
