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fast(left) vs slow(right)

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.file "s352.c"

.text

.globl dummy // -- Begin function dummy

.p2align 4

.type dummy,@function

dummy: // @dummy

.cfi_startproc

// %bb.0:

mov w0, wzr

ret

.Lfunc_end0:

.size dummy, .Lfunc_end0-dummy

.cfi_endproc

// -- End function

.globl s352 // -- Begin function s352

.p2align 4

.type s352,@function

s352: // @s352

.cfi_startproc

// %bb.0:

stp d11, d10, [sp, #-32]! // 16-byte Folded Spill

.cfi_def_cfa_offset 32

stp d9, d8, [sp, #16] // 16-byte Folded Spill

.cfi_offset b8, -8

.cfi_offset b9, -16

.cfi_offset b10, -24

.cfi_offset b11, -32

adrp x9, :got:b

adrp x10, :got:a

mov w11, #13568 // =0x3500

mov w8, wzr

ldr x9, [x9, :got_lo12:b]

ldr x10, [x10, :got_lo12:a]

movk w11, #12, lsl #16

.p2align 5, , 16

.LBB1_1: // =>This Loop Header: Depth=1

// Child Loop BB1_2 Depth 2

add x12, x9, #80

add x13, x10, #80

mov w14, #6400 // =0x1900

movi d0, #0000000000000000

mov x12, x10

mov x13, x9

movi d1, #0000000000000000

movi d2, #0000000000000000

movi d3, #0000000000000000

.p2align 5, , 16

.LBB1_2: // Parent Loop BB1_1 Depth=1

// => This Inner Loop Header: Depth=2

ldp q8, q4, [x13, #-80]

ldp q2, q3, [x12]

ldp q9, q10, [x12, #-80]

ldp q16, q17, [x13]

subs x14, x14, #8

subs x14, x14, #4

fmul v4.4s, v10.4s, v4.4s

fmul v3.4s, v17.4s, v3.4s

ldur q5, [x13, #-48]

ldr q4, [x12, #32]

ldur q21, [x13, #-40]

ldur q5, [x12, #40]

ldur q23, [x13, #-24]

ldur q6, [x12, #56]

ldur q6, [x13, #40]

ldr q18, [x13, #32]

ldur q7, [x13, #56]

ldur q19, [x13, #40]

ldur q11, [x12, #-48]

ldur q20, [x13, #56]

ldur q29, [x12, #-40]

ldr d7, [x12, #72]

ldur q30, [x12, #-24]

ldr d21, [x13, #72]

ldur q20, [x12, #40]

add x13, x13, #80

ldur q22, [x12, #56]

add x12, x12, #80

ldur d25, [x13, #-8]

fmul v2.4s, v16.4s, v2.4s

fmul v8.4s, v9.4s, v8.4s

fmul v4.4s, v18.4s, v4.4s

ldp q17, q18, [x13]

ldr d16, [x13, #72]

ldur d31, [x12, #-8]

ldp q26, q27, [x12]

fmul v5.4s, v11.4s, v5.4s

fmul v23.4s, v30.4s, v23.4s

fmul v21.4s, v29.4s, v21.4s

fmul v7.4s, v22.4s, v7.4s

fmul v6.4s, v20.4s, v6.4s

fmul v25.4s, v31.4s, v25.4s

fmul v5.4s, v19.4s, v5.4s

fmul v18.4s, v27.4s, v18.4s

fmul v7.4s, v21.4s, v7.4s

fmul v17.4s, v26.4s, v17.4s

zip2 v16.4s, v2.4s, v3.4s

zip2 v9.4s, v8.4s, v4.4s

zip2 v17.4s, v3.4s, v2.4s

ldr d24, [x12, #72]

ext v18.16b, v2.16b, v4.16b, #12

ldr q19, [x13, #32]

zip2 v19.4s, v5.4s, v6.4s

ldr q28, [x12, #32]

zip2 v20.4s, v6.4s, v5.4s

zip2 v10.4s, v4.4s, v8.4s

ext v21.16b, v5.16b, v7.16b, #12

fmul v16.4s, v24.4s, v16.4s

trn2 v16.4s, v2.4s, v16.4s

ext v11.16b, v8.16b, v5.16b, #12

ext v17.16b, v17.16b, v2.16b, #4

zip2 v29.4s, v21.4s, v23.4s

mov v2.s[1], v3.s[1]

zip2 v30.4s, v23.4s, v21.4s

trn2 v19.4s, v5.4s, v19.4s

zip2 v20.4s, v6.4s, v7.4s

ext v20.16b, v20.16b, v5.16b, #4

zip2 v22.4s, v7.4s, v6.4s

mov v5.s[1], v6.s[1]

fmul v19.4s, v28.4s, v19.4s

mov v3.s[1], v4.s[1]

ext v31.16b, v21.16b, v25.16b, #12

zip2 v26.4s, v17.4s, v18.4s

zip2 v27.4s, v18.4s, v17.4s

ext v24.16b, v6.16b, v16.16b, #12

ext v28.16b, v17.16b, v19.16b, #12

add x12, x12, #160

add x13, x13, #160

trn2 v9.4s, v8.4s, v9.4s

ext v10.16b, v10.16b, v8.16b, #4

mov v8.s[1], v4.s[1]

trn2 v29.4s, v21.4s, v29.4s

ext v30.16b, v30.16b, v21.16b, #4

mov v21.s[1], v23.s[1]

trn2 v20.4s, v6.4s, v20.4s

ext v22.16b, v22.16b, v6.16b, #4

mov v6.s[1], v7.s[1]

trn2 v26.4s, v17.4s, v26.4s

fadd v0.2s, v2.2s, v0.2s

ext v27.16b, v27.16b, v17.16b, #4

fadd v1.2s, v5.2s, v1.2s

mov v17.s[1], v18.s[1]

fadd v2.2s, v17.2s, v18.2s

mov v4.s[1], v5.s[1]

fadd v0.2s, v0.2s, v16.2s

mov v23.s[1], v25.s[1]

fadd v1.2s, v1.2s, v19.2s

mov v18.s[1], v19.s[1]

fadd v0.2s, v0.2s, v2.2s

mov v7.s[1], v16.s[1]

fadd v2.2s, v20.2s, v21.2s

fadd v0.2s, v8.2s, v0.2s

fadd v1.2s, v1.2s, v2.2s

fadd v1.2s, v21.2s, v1.2s

fadd v0.2s, v0.2s, v3.2s

fadd v3.2s, v6.2s, v3.2s

fadd v6.2s, v10.2s, v11.2s

fadd v2.2s, v17.2s, v2.2s

fadd v0.2s, v0.2s, v9.2s

fadd v1.2s, v1.2s, v29.2s

fadd v2.2s, v2.2s, v26.2s

fadd v3.2s, v3.2s, v20.2s

fadd v0.2s, v0.2s, v6.2s

fadd v6.2s, v30.2s, v31.2s

fadd v1.2s, v1.2s, v6.2s

fadd v6.2s, v27.2s, v28.2s

fadd v0.2s, v0.2s, v4.2s

fadd v2.2s, v2.2s, v6.2s

fadd v6.2s, v22.2s, v24.2s

fadd v1.2s, v1.2s, v23.2s

fadd v3.2s, v3.2s, v6.2s

fadd v2.2s, v2.2s, v18.2s

fadd v3.2s, v3.2s, v7.2s

b.ne .LBB1_2

// %bb.3: // in Loop: Header=BB1_1 Depth=1

add w8, w8, #1

cmp w8, w11

b.ne .LBB1_1

// %bb.4:

fadd v0.2s, v1.2s, v0.2s

ldp d9, d8, [sp, #16] // 16-byte Folded Reload

fadd v0.2s, v2.2s, v0.2s

fadd v0.2s, v3.2s, v0.2s

faddp s0, v0.2s

ldp d11, d10, [sp], #32 // 16-byte Folded Reload

.cfi_def_cfa_offset 0

.cfi_restore b8

.cfi_restore b9

.cfi_restore b10

.cfi_restore b11

ret

.Lfunc_end1:

.size s352, .Lfunc_end1-s352

.cfi_endproc

// -- End function

.ident "clang version 21.0.0git (https://github.com/llvm/llvm-project.git 50349d12aa2824a0418388c9de320a2e96ad2ca5)"

.ident "clang version 21.0.0git (https://github.com/llvm/llvm-project.git bb2f7596a8b963af06e9dde821dcea1252ba4892)"

.section ".note.GNU-stack","",@progbits

.addrsig

Saved diffs

Original text

Open file

.file	"s352.c"
	.text
	.globl	dummy                           // -- Begin function dummy
	.p2align	4
	.type	dummy,@function
dummy:                                  // @dummy
	.cfi_startproc
// %bb.0:
	mov	w0, wzr
	ret
.Lfunc_end0:
	.size	dummy, .Lfunc_end0-dummy
	.cfi_endproc
                                        // -- End function
	.globl	s352                            // -- Begin function s352
	.p2align	4
	.type	s352,@function
s352:                                   // @s352
	.cfi_startproc
// %bb.0:
	stp	d11, d10, [sp, #-32]!           // 16-byte Folded Spill
	.cfi_def_cfa_offset 32
	stp	d9, d8, [sp, #16]               // 16-byte Folded Spill
	.cfi_offset b8, -8
	.cfi_offset b9, -16
	.cfi_offset b10, -24
	.cfi_offset b11, -32
	adrp	x9, :got:b
	adrp	x10, :got:a
	mov	w11, #13568                     // =0x3500
	mov	w8, wzr
	ldr	x9, [x9, :got_lo12:b]
	ldr	x10, [x10, :got_lo12:a]
	movk	w11, #12, lsl #16
	.p2align	5, , 16
.LBB1_1:                                // =>This Loop Header: Depth=1
                                        //     Child Loop BB1_2 Depth 2
	add	x12, x9, #80
	add	x13, x10, #80
	mov	w14, #6400                      // =0x1900
	movi	d0, #0000000000000000
	movi	d1, #0000000000000000
	movi	d2, #0000000000000000
	movi	d3, #0000000000000000
	.p2align	5, , 16
.LBB1_2:                                //   Parent Loop BB1_1 Depth=1
                                        // =>  This Inner Loop Header: Depth=2
	ldp	q8, q4, [x13, #-80]
	ldp	q9, q10, [x12, #-80]
	subs	x14, x14, #8
	fmul	v4.4s, v10.4s, v4.4s
	ldur	q5, [x13, #-48]
	ldur	q21, [x13, #-40]
	ldur	q23, [x13, #-24]
	ldur	q6, [x13, #40]
	ldur	q7, [x13, #56]
	ldur	q11, [x12, #-48]
	ldur	q29, [x12, #-40]
	ldur	q30, [x12, #-24]
	ldur	q20, [x12, #40]
	ldur	q22, [x12, #56]
	ldur	d25, [x13, #-8]
	fmul	v8.4s, v9.4s, v8.4s
	ldp	q17, q18, [x13]
	ldr	d16, [x13, #72]
	ldur	d31, [x12, #-8]
	ldp	q26, q27, [x12]
	fmul	v5.4s, v11.4s, v5.4s
	fmul	v23.4s, v30.4s, v23.4s
	fmul	v21.4s, v29.4s, v21.4s
	fmul	v7.4s, v22.4s, v7.4s
	fmul	v6.4s, v20.4s, v6.4s
	fmul	v25.4s, v31.4s, v25.4s
	fmul	v18.4s, v27.4s, v18.4s
	fmul	v17.4s, v26.4s, v17.4s
	zip2	v9.4s, v8.4s, v4.4s
	ldr	d24, [x12, #72]
	ldr	q19, [x13, #32]
	ldr	q28, [x12, #32]
	zip2	v10.4s, v4.4s, v8.4s
	fmul	v16.4s, v24.4s, v16.4s
	ext	v11.16b, v8.16b, v5.16b, #12
	zip2	v29.4s, v21.4s, v23.4s
	zip2	v30.4s, v23.4s, v21.4s
	zip2	v20.4s, v6.4s, v7.4s
	zip2	v22.4s, v7.4s, v6.4s
	fmul	v19.4s, v28.4s, v19.4s
	ext	v31.16b, v21.16b, v25.16b, #12
	zip2	v26.4s, v17.4s, v18.4s
	zip2	v27.4s, v18.4s, v17.4s
	ext	v24.16b, v6.16b, v16.16b, #12
	ext	v28.16b, v17.16b, v19.16b, #12
	add	x12, x12, #160
	add	x13, x13, #160
	trn2	v9.4s, v8.4s, v9.4s
	ext	v10.16b, v10.16b, v8.16b, #4
	mov	v8.s[1], v4.s[1]
	trn2	v29.4s, v21.4s, v29.4s
	ext	v30.16b, v30.16b, v21.16b, #4
	mov	v21.s[1], v23.s[1]
	trn2	v20.4s, v6.4s, v20.4s
	ext	v22.16b, v22.16b, v6.16b, #4
	mov	v6.s[1], v7.s[1]
	trn2	v26.4s, v17.4s, v26.4s
	ext	v27.16b, v27.16b, v17.16b, #4
	mov	v17.s[1], v18.s[1]
	mov	v4.s[1], v5.s[1]
	mov	v23.s[1], v25.s[1]
	mov	v18.s[1], v19.s[1]
	mov	v7.s[1], v16.s[1]
	fadd	v0.2s, v8.2s, v0.2s
	fadd	v1.2s, v21.2s, v1.2s
	fadd	v3.2s, v6.2s, v3.2s
	fadd	v6.2s, v10.2s, v11.2s
	fadd	v2.2s, v17.2s, v2.2s
	fadd	v0.2s, v0.2s, v9.2s
	fadd	v1.2s, v1.2s, v29.2s
	fadd	v2.2s, v2.2s, v26.2s
	fadd	v3.2s, v3.2s, v20.2s
	fadd	v0.2s, v0.2s, v6.2s
	fadd	v6.2s, v30.2s, v31.2s
	fadd	v1.2s, v1.2s, v6.2s
	fadd	v6.2s, v27.2s, v28.2s
	fadd	v0.2s, v0.2s, v4.2s
	fadd	v2.2s, v2.2s, v6.2s
	fadd	v6.2s, v22.2s, v24.2s
	fadd	v1.2s, v1.2s, v23.2s
	fadd	v3.2s, v3.2s, v6.2s
	fadd	v2.2s, v2.2s, v18.2s
	fadd	v3.2s, v3.2s, v7.2s
	b.ne	.LBB1_2
// %bb.3:                               //   in Loop: Header=BB1_1 Depth=1
	add	w8, w8, #1
	cmp	w8, w11
	b.ne	.LBB1_1
// %bb.4:
	fadd	v0.2s, v1.2s, v0.2s
	ldp	d9, d8, [sp, #16]               // 16-byte Folded Reload
	fadd	v0.2s, v2.2s, v0.2s
	fadd	v0.2s, v3.2s, v0.2s
	faddp	s0, v0.2s
	ldp	d11, d10, [sp], #32             // 16-byte Folded Reload
	.cfi_def_cfa_offset 0
	.cfi_restore b8
	.cfi_restore b9
	.cfi_restore b10
	.cfi_restore b11
	ret
.Lfunc_end1:
	.size	s352, .Lfunc_end1-s352
	.cfi_endproc
                                        // -- End function
	.ident	"clang version 21.0.0git (https://github.com/llvm/llvm-project.git 50349d12aa2824a0418388c9de320a2e96ad2ca5)"
	.section	".note.GNU-stack","",@progbits
	.addrsig

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