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[X86][BF16] Customize VSELECT for BF16 under AVX-NECONVERT (#113322)
Fixes: https://godbolt.org/z/9abGnE8zs
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‎llvm/lib/Target/X86/X86ISelLowering.cpp‎

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@@ -2393,6 +2393,8 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
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setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::bf16, Custom);
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for (auto VT : {MVT::v8bf16, MVT::v16bf16}) {
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setF16Action(VT, Expand);
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if (!Subtarget.hasBF16())
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setOperationAction(ISD::VSELECT, VT, Custom);
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setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
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setOperationAction(ISD::VECTOR_SHUFFLE, VT, Custom);
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setOperationAction(ISD::INSERT_SUBVECTOR, VT, Legal);

‎llvm/test/CodeGen/X86/avxneconvert-intrinsics.ll‎

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@@ -215,3 +215,117 @@ define <8 x bfloat> @test_int_x86_vcvtneps2bf16256(<8 x float> %A) {
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}
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declare <8 x bfloat> @llvm.x86.vcvtneps2bf16256(<8 x float> %A)
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define <8 x bfloat> @select(i8 %x, <8 x bfloat> %y) nounwind {
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; X64-LABEL: select:
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; X64: # %bb.0:
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; X64-NEXT: vmovaps %xmm0, %xmm1 # encoding: [0xc5,0xf8,0x28,0xc8]
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; X64-NEXT: movb %dil, %al # encoding: [0x40,0x88,0xf8]
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; X64-NEXT: movb %al, -{{[0-9]+}}(%rsp) # encoding: [0x88,0x44,0x24,0xff]
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; X64-NEXT: movzbl -{{[0-9]+}}(%rsp), %eax # encoding: [0x0f,0xb6,0x44,0x24,0xff]
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; X64-NEXT: movl %eax, %ecx # encoding: [0x89,0xc1]
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; X64-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X64-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X64-NEXT: vmovd %ecx, %xmm0 # encoding: [0xc5,0xf9,0x6e,0xc1]
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; X64-NEXT: # kill: def $al killed $al killed $eax
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; X64-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X64-NEXT: shrb %cl # encoding: [0xd0,0xe9]
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; X64-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X64-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X64-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X64-NEXT: vpinsrw $1, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x01]
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; X64-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X64-NEXT: shrb $2, %cl # encoding: [0xc0,0xe9,0x02]
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; X64-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X64-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X64-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X64-NEXT: vpinsrw $2, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x02]
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; X64-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X64-NEXT: shrb $3, %cl # encoding: [0xc0,0xe9,0x03]
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; X64-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X64-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X64-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X64-NEXT: vpinsrw $3, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x03]
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; X64-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X64-NEXT: shrb $4, %cl # encoding: [0xc0,0xe9,0x04]
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; X64-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X64-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X64-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X64-NEXT: vpinsrw $4, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x04]
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; X64-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X64-NEXT: shrb $5, %cl # encoding: [0xc0,0xe9,0x05]
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; X64-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X64-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X64-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X64-NEXT: vpinsrw $5, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x05]
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; X64-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X64-NEXT: shrb $6, %cl # encoding: [0xc0,0xe9,0x06]
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; X64-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X64-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X64-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X64-NEXT: vpinsrw $6, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x06]
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; X64-NEXT: shrb $7, %al # encoding: [0xc0,0xe8,0x07]
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; X64-NEXT: movzbl %al, %eax # encoding: [0x0f,0xb6,0xc0]
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; X64-NEXT: negl %eax # encoding: [0xf7,0xd8]
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; X64-NEXT: vpinsrw $7, %eax, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc0,0x07]
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; X64-NEXT: vpandn %xmm1, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xdf,0xc1]
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; X64-NEXT: retq # encoding: [0xc3]
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;
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; X86-LABEL: select:
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; X86: # %bb.0:
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; X86-NEXT: pushl %eax # encoding: [0x50]
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; X86-NEXT: vmovaps %xmm0, %xmm1 # encoding: [0xc5,0xf8,0x28,0xc8]
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; X86-NEXT: movb {{[0-9]+}}(%esp), %al # encoding: [0x8a,0x44,0x24,0x08]
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; X86-NEXT: movb %al, {{[0-9]+}}(%esp) # encoding: [0x88,0x44,0x24,0x03]
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; X86-NEXT: movzbl {{[0-9]+}}(%esp), %eax # encoding: [0x0f,0xb6,0x44,0x24,0x03]
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; X86-NEXT: movl %eax, %ecx # encoding: [0x89,0xc1]
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; X86-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X86-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X86-NEXT: vmovd %ecx, %xmm0 # encoding: [0xc5,0xf9,0x6e,0xc1]
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; X86-NEXT: # kill: def $al killed $al killed $eax
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; X86-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X86-NEXT: shrb %cl # encoding: [0xd0,0xe9]
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; X86-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X86-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X86-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X86-NEXT: vpinsrw $1, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x01]
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; X86-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X86-NEXT: shrb $2, %cl # encoding: [0xc0,0xe9,0x02]
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; X86-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X86-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X86-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X86-NEXT: vpinsrw $2, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x02]
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; X86-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X86-NEXT: shrb $3, %cl # encoding: [0xc0,0xe9,0x03]
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; X86-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X86-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X86-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X86-NEXT: vpinsrw $3, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x03]
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; X86-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X86-NEXT: shrb $4, %cl # encoding: [0xc0,0xe9,0x04]
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; X86-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X86-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X86-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X86-NEXT: vpinsrw $4, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x04]
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; X86-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X86-NEXT: shrb $5, %cl # encoding: [0xc0,0xe9,0x05]
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; X86-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X86-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X86-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X86-NEXT: vpinsrw $5, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x05]
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; X86-NEXT: movb %al, %cl # encoding: [0x88,0xc1]
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; X86-NEXT: shrb $6, %cl # encoding: [0xc0,0xe9,0x06]
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; X86-NEXT: movzbl %cl, %ecx # encoding: [0x0f,0xb6,0xc9]
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; X86-NEXT: andl $1, %ecx # encoding: [0x83,0xe1,0x01]
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; X86-NEXT: negl %ecx # encoding: [0xf7,0xd9]
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; X86-NEXT: vpinsrw $6, %ecx, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc1,0x06]
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; X86-NEXT: shrb $7, %al # encoding: [0xc0,0xe8,0x07]
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; X86-NEXT: movzbl %al, %eax # encoding: [0x0f,0xb6,0xc0]
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; X86-NEXT: negl %eax # encoding: [0xf7,0xd8]
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; X86-NEXT: vpinsrw $7, %eax, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xc4,0xc0,0x07]
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; X86-NEXT: vpandn %xmm1, %xmm0, %xmm0 # encoding: [0xc5,0xf9,0xdf,0xc1]
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; X86-NEXT: popl %eax # encoding: [0x58]
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; X86-NEXT: retl # encoding: [0xc3]
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%1 = bitcast i8 %x to <8 x i1>
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%2 = select <8 x i1> %1, <8 x bfloat> zeroinitializer, <8 x bfloat> %y
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ret <8 x bfloat> %2
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}

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