test.cpp

// xcrun clang++ test.cpp -O3 -o - -S -std=c++11 -mavx 

#include <simd/simd.h>

namespace {
static constexpr simd_packed_uchar16 zero = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
                                             0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
                                             0x0, 0x0, 0x0, 0x0};
} // end anonymous namespace

static simd::ushort8 unpackLower(simd::uchar16 input) {
  return (simd::ushort8)__builtin_shufflevector(
      input, zero, 0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23);
}

static simd::ushort8 unpackUpper(simd::uchar16 input) {
  return (simd::ushort8)__builtin_shufflevector(input, zero, 8, 24, 9, 25,
                                                      10, 26, 11, 27, 12, 28,
                                                      13, 29, 14, 30, 15, 31);
}

static simd::short8 performComparisonLow(simd::uchar16 lhs, simd::ushort8 rhs) {
  return unpackLower(lhs) != rhs;
}

static simd::short8 performComparisonHigh(simd::uchar16 lhs, simd::ushort8 rhs) {
  return unpackUpper(lhs) != rhs;
}

simd::char16 equalP2(simd::ushort8 *lhs, simd::uchar16 rhs) {
  return (simd::char16)(performComparisonLow(rhs, lhs[0]) | performComparisonHigh(rhs, lhs[1]));
  
}

simd::char16 equalP(simd::ushort8 *lhs, simd::uchar16 rhs) {
  auto lhsAsUInt8 = ((simd::uchar32 *)lhs)[0];
  // lhs == rhs if the low bytes are equal and the high-byte of lhs is zero.
  return lhsAsUInt8.even == rhs & lhsAsUInt8.odd == 0;
}

test.S

## // xcrun clang++ test.cpp -O3 -o - -S -std=c++11 -mavx 

.section	__TEXT,__text,regular,pure_instructions
	.macosx_version_min 10, 13
	.globl	__Z7equalP2PDv8_tDv16_h ## -- Begin function _Z7equalP2PDv8_tDv16_h
	.p2align	4, 0x90
__Z7equalP2PDv8_tDv16_h:                ## @_Z7equalP2PDv8_tDv16_h
	.cfi_startproc
## BB#0:
	pushq	%rbp
Lcfi0:
	.cfi_def_cfa_offset 16
Lcfi1:
	.cfi_offset %rbp, -16
	movq	%rsp, %rbp
Lcfi2:
	.cfi_def_cfa_register %rbp
	vpmovzxbw	%xmm0, %xmm1    ## xmm1 = xmm0[0],zero,xmm0[1],zero,xmm0[2],zero,xmm0[3],zero,xmm0[4],zero,xmm0[5],zero,xmm0[6],zero,xmm0[7],zero
	vpcmpeqw	(%rdi), %xmm1, %xmm1
	vpcmpeqd	%xmm2, %xmm2, %xmm2
	vpxor	%xmm2, %xmm1, %xmm1
	vpxor	%xmm3, %xmm3, %xmm3
	vpunpckhbw	%xmm3, %xmm0, %xmm0 ## xmm0 = xmm0[8],xmm3[8],xmm0[9],xmm3[9],xmm0[10],xmm3[10],xmm0[11],xmm3[11],xmm0[12],xmm3[12],xmm0[13],xmm3[13],xmm0[14],xmm3[14],xmm0[15],xmm3[15]
	vpcmpeqw	16(%rdi), %xmm0, %xmm0
	vpxor	%xmm2, %xmm0, %xmm0
	vpor	%xmm1, %xmm0, %xmm0
	popq	%rbp
	retq
	.cfi_endproc
                                        ## -- End function
	.section	__TEXT,__literal16,16byte_literals
	.p2align	4               ## -- Begin function _Z6equalPPDv8_tDv16_h
LCPI1_0:
	.byte	0                       ## 0x0
	.byte	2                       ## 0x2
	.byte	4                       ## 0x4
	.byte	6                       ## 0x6
	.byte	8                       ## 0x8
	.byte	10                      ## 0xa
	.byte	12                      ## 0xc
	.byte	14                      ## 0xe
	.space	1
	.space	1
	.space	1
	.space	1
	.space	1
	.space	1
	.space	1
	.space	1
LCPI1_1:
	.byte	1                       ## 0x1
	.byte	3                       ## 0x3
	.byte	5                       ## 0x5
	.byte	7                       ## 0x7
	.byte	9                       ## 0x9
	.byte	11                      ## 0xb
	.byte	13                      ## 0xd
	.byte	15                      ## 0xf
	.space	1
	.space	1
	.space	1
	.space	1
	.space	1
	.space	1
	.space	1
	.space	1
	.section	__TEXT,__text,regular,pure_instructions
	.globl	__Z6equalPPDv8_tDv16_h
	.p2align	4, 0x90
__Z6equalPPDv8_tDv16_h:                 ## @_Z6equalPPDv8_tDv16_h
	.cfi_startproc
## BB#0:
	pushq	%rbp
Lcfi3:
	.cfi_def_cfa_offset 16
Lcfi4:
	.cfi_offset %rbp, -16
	movq	%rsp, %rbp
Lcfi5:
	.cfi_def_cfa_register %rbp
	vmovdqu	(%rdi), %ymm1
	vmovdqa	LCPI1_0(%rip), %xmm2    ## xmm2 = <0,2,4,6,8,10,12,14,u,u,u,u,u,u,u,u>
	vextractf128	$1, %ymm1, %xmm3
	vpshufb	%xmm2, %xmm3, %xmm4
	vpshufb	%xmm2, %xmm1, %xmm2
	vpunpcklqdq	%xmm4, %xmm2, %xmm2 ## xmm2 = xmm2[0],xmm4[0]
	vpcmpeqb	%xmm0, %xmm2, %xmm0
	vmovdqa	LCPI1_1(%rip), %xmm2    ## xmm2 = <1,3,5,7,9,11,13,15,u,u,u,u,u,u,u,u>
	vpshufb	%xmm2, %xmm3, %xmm3
	vpshufb	%xmm2, %xmm1, %xmm1
	vpunpcklqdq	%xmm3, %xmm1, %xmm1 ## xmm1 = xmm1[0],xmm3[0]
	vpxor	%xmm2, %xmm2, %xmm2
	vpcmpeqb	%xmm2, %xmm1, %xmm1
	vpand	%xmm0, %xmm1, %xmm0
	popq	%rbp
	vzeroupper
	retq
	.cfi_endproc
                                        ## -- End function

.subsections_via_symbols