Carrot added a comment.
Before this patch I have a code snippet
│ 80: mov -0x58(%rsp),%rdx
│ mov -0x60(%rsp),%r9
│ mov -0x40(%rsp),%r15
0.63 │ 8f: mulps %xmm8,%xmm9
0.44 │ movups (%rdx,%r9,4),%xmm1
0.36 │ addps %xmm9,%xmm1
0.25 │ movups %xmm1,(%rdx,%r9,4)
0.75 │ mulps %xmm8,%xmm3
0.41 │ movups (%rdx,%r10,4),%xmm1
0.86 │ addps %xmm3,%xmm1
0.70 │ movups %xmm1,(%rdx,%r10,4)
0.43 │ add $0x8,%r9
0.28 │ add -0x48(%rsp),%rbx
0.07 │ cmp %r15,%r9
0.14 │ ↓ jge 3e5
...
After this patch, it is changed to
0.33 │ 80: mov %r12,%rdx
0.32 │ or $0x1,%rdx
0.32 │ mov %r12,%rdi
0.39 │ or $0x2,%rdi
0.38 │ mov %r12,%rcx
0.30 │ or $0x3,%rcx
0.37 │ mov %r12,%rbp
0.39 │ or $0x4,%rbp
0.31 │ mov %r12,%r10
0.27 │ or $0x5,%r10
0.31 │ mov %r12,%r9
0.37 │ or $0x6,%r9
0.29 │ mov %r12,%r8
0.35 │ or $0x7,%r8
0.34 │ b1: mulss %xmm8,%xmm13
0.39 │ addss (%r11,%r12,4),%xmm13
0.33 │ movss %xmm13,(%r11,%r12,4)
0.33 │ mulss %xmm8,%xmm12
0.41 │ addss (%r11,%rdx,4),%xmm12
0.38 │ movss %xmm12,(%r11,%rdx,4)
0.31 │ mulss %xmm8,%xmm3
0.39 │ addss (%r11,%rdi,4),%xmm3
0.35 │ movss %xmm3,(%r11,%rdi,4)
0.41 │ mulss %xmm8,%xmm4
0.31 │ addss (%r11,%rcx,4),%xmm4
0.31 │ movss %xmm4,(%r11,%rcx,4)
0.34 │ mulss %xmm8,%xmm5
0.41 │ addss (%r11,%rbp,4),%xmm5
0.34 │ movss %xmm5,(%r11,%rbp,4)
0.32 │ mulss %xmm8,%xmm6
0.34 │ addss (%r11,%r10,4),%xmm6
0.38 │ movss %xmm6,(%r11,%r10,4)
0.35 │ mulss %xmm8,%xmm7
0.43 │ addss (%r11,%r9,4),%xmm7
0.38 │ movss %xmm7,(%r11,%r9,4)
0.41 │ mulss %xmm8,%xmm1
0.36 │ addss (%r11,%r8,4),%xmm1
0.32 │ movss %xmm1,(%r11,%r8,4)
0.39 │ add $0x8,%r12
0.39 │ add -0x18(%rsp),%rbx
0.02 │ cmp -0x60(%rsp),%r12
0.31 │ ↓ jge 510
...
Repository:
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https://reviews.llvm.org/D119965/new/
https://reviews.llvm.org/D119965