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llvm-mirror/test/CodeGen/X86/sse1.ll
Simon Pilgrim 21418c85a1 [X86][SSE] getV4X86ShuffleImm8 - canonicalize broadcast masks 
If the mask input to getV4X86ShuffleImm8 only refers to a single source element (+ undefs) then canonicalize to a full broadcast.

getV4X86ShuffleImm8 defaults to inline values for undefs, which can be useful for shuffle widening/narrowing but does leave SimplifyDemanded* calls thinking the shuffle depends on unnecessary elements.

I'm still investigating what we should do more generally to avoid these undemanded elements, but broadcast cases was a simpler win.
2020-07-29 11:32:44 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i386-unknown-unknown -mattr=+sse -O3 | FileCheck %s --check-prefixes=CHECK,X86
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=-sse2,+sse -O3 | FileCheck %s --check-prefixes=CHECK,X64
; Tests for SSE1 and below, without SSE2+.
; PR7993
;define <4 x i32> @test3(<4 x i16> %a) nounwind {
; %c = sext <4 x i16> %a to <4 x i32> ; <<4 x i32>> [#uses=1]
; ret <4 x i32> %c
;}
; This should not emit shuffles to populate the top 2 elements of the 4-element
; vector that this ends up returning.
; rdar://8368414
define <2 x float> @test4(<2 x float> %A, <2 x float> %B) nounwind {
; CHECK-LABEL: test4:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: movaps %xmm0, %xmm2
; CHECK-NEXT: shufps {{.*#+}} xmm2 = xmm2[1,1],xmm0[1,1]
; CHECK-NEXT: addss %xmm1, %xmm0
; CHECK-NEXT: shufps {{.*#+}} xmm1 = xmm1[1,1,1,1]
; CHECK-NEXT: subss %xmm1, %xmm2
; CHECK-NEXT: unpcklps {{.*#+}} xmm0 = xmm0[0],xmm2[0],xmm0[1],xmm2[1]
; CHECK-NEXT: ret{{[l|q]}}
entry:
%tmp7 = extractelement <2 x float> %A, i32 0
%tmp5 = extractelement <2 x float> %A, i32 1
%tmp3 = extractelement <2 x float> %B, i32 0
%tmp1 = extractelement <2 x float> %B, i32 1
%add.r = fadd float %tmp7, %tmp3
%add.i = fsub float %tmp5, %tmp1
%tmp11 = insertelement <2 x float> undef, float %add.r, i32 0
%tmp9 = insertelement <2 x float> %tmp11, float %add.i, i32 1
ret <2 x float> %tmp9
}
; We used to get stuck in type legalization for this example when lowering the
; vselect. With SSE1 v4f32 is a legal type but v4i1 (or any vector integer type)
; is not. We used to ping pong between splitting the vselect for the v4i
; condition operand and widening the resulting vselect for the v4f32 result.
; PR18036
define <4 x float> @vselect(<4 x float>*%p, <4 x i32> %q) {
; X86-LABEL: vselect:
; X86: # %bb.0: # %entry
; X86-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X86-NEXT: xorps %xmm0, %xmm0
; X86-NEXT: je .LBB1_1
; X86-NEXT: # %bb.2: # %entry
; X86-NEXT: xorps %xmm1, %xmm1
; X86-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X86-NEXT: jne .LBB1_5
; X86-NEXT: .LBB1_4:
; X86-NEXT: movss {{.*#+}} xmm2 = mem[0],zero,zero,zero
; X86-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X86-NEXT: jne .LBB1_8
; X86-NEXT: .LBB1_7:
; X86-NEXT: movss {{.*#+}} xmm3 = mem[0],zero,zero,zero
; X86-NEXT: unpcklps {{.*#+}} xmm2 = xmm2[0],xmm3[0],xmm2[1],xmm3[1]
; X86-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X86-NEXT: je .LBB1_10
; X86-NEXT: jmp .LBB1_11
; X86-NEXT: .LBB1_1:
; X86-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; X86-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X86-NEXT: je .LBB1_4
; X86-NEXT: .LBB1_5: # %entry
; X86-NEXT: xorps %xmm2, %xmm2
; X86-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X86-NEXT: je .LBB1_7
; X86-NEXT: .LBB1_8: # %entry
; X86-NEXT: xorps %xmm3, %xmm3
; X86-NEXT: unpcklps {{.*#+}} xmm2 = xmm2[0],xmm3[0],xmm2[1],xmm3[1]
; X86-NEXT: cmpl $0, {{[0-9]+}}(%esp)
; X86-NEXT: jne .LBB1_11
; X86-NEXT: .LBB1_10:
; X86-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
; X86-NEXT: .LBB1_11: # %entry
; X86-NEXT: unpcklps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
; X86-NEXT: movlhps {{.*#+}} xmm0 = xmm0[0],xmm2[0]
; X86-NEXT: retl
;
; X64-LABEL: vselect:
; X64: # %bb.0: # %entry
; X64-NEXT: testl %edx, %edx
; X64-NEXT: xorps %xmm0, %xmm0
; X64-NEXT: je .LBB1_1
; X64-NEXT: # %bb.2: # %entry
; X64-NEXT: xorps %xmm1, %xmm1
; X64-NEXT: testl %ecx, %ecx
; X64-NEXT: jne .LBB1_5
; X64-NEXT: .LBB1_4:
; X64-NEXT: movss {{.*#+}} xmm2 = mem[0],zero,zero,zero
; X64-NEXT: testl %r8d, %r8d
; X64-NEXT: jne .LBB1_8
; X64-NEXT: .LBB1_7:
; X64-NEXT: movss {{.*#+}} xmm3 = mem[0],zero,zero,zero
; X64-NEXT: unpcklps {{.*#+}} xmm2 = xmm2[0],xmm3[0],xmm2[1],xmm3[1]
; X64-NEXT: testl %esi, %esi
; X64-NEXT: je .LBB1_10
; X64-NEXT: jmp .LBB1_11
; X64-NEXT: .LBB1_1:
; X64-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; X64-NEXT: testl %ecx, %ecx
; X64-NEXT: je .LBB1_4
; X64-NEXT: .LBB1_5: # %entry
; X64-NEXT: xorps %xmm2, %xmm2
; X64-NEXT: testl %r8d, %r8d
; X64-NEXT: je .LBB1_7
; X64-NEXT: .LBB1_8: # %entry
; X64-NEXT: xorps %xmm3, %xmm3
; X64-NEXT: unpcklps {{.*#+}} xmm2 = xmm2[0],xmm3[0],xmm2[1],xmm3[1]
; X64-NEXT: testl %esi, %esi
; X64-NEXT: jne .LBB1_11
; X64-NEXT: .LBB1_10:
; X64-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
; X64-NEXT: .LBB1_11: # %entry
; X64-NEXT: unpcklps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
; X64-NEXT: movlhps {{.*#+}} xmm0 = xmm0[0],xmm2[0]
; X64-NEXT: retq
entry:
%a1 = icmp eq <4 x i32> %q, zeroinitializer
%a14 = select <4 x i1> %a1, <4 x float> <float 1.000000e+00, float 2.000000e+00, float 3.000000e+00, float 4.000000e+0> , <4 x float> zeroinitializer
ret <4 x float> %a14
}
; v4i32 isn't legal for SSE1, but this should be cmpps.
define <4 x float> @PR28044(<4 x float> %a0, <4 x float> %a1) nounwind {
; CHECK-LABEL: PR28044:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpeqps %xmm1, %xmm0
; CHECK-NEXT: ret{{[l|q]}}
%cmp = fcmp oeq <4 x float> %a0, %a1
%sext = sext <4 x i1> %cmp to <4 x i32>
%res = bitcast <4 x i32> %sext to <4 x float>
ret <4 x float> %res
}
; Don't crash trying to do the impossible: an integer vector comparison doesn't exist, so we must scalarize.
; https://llvm.org/bugs/show_bug.cgi?id=30512
define <4 x i32> @PR30512(<4 x i32> %x, <4 x i32> %y) nounwind {
; X86-LABEL: PR30512:
; X86: # %bb.0:
; X86-NEXT: pushl %ebx
; X86-NEXT: pushl %edi
; X86-NEXT: pushl %esi
; X86-NEXT: subl $16, %esp
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
; X86-NEXT: movl {{[0-9]+}}(%esp), %edi
; X86-NEXT: xorl %ebx, %ebx
; X86-NEXT: cmpl {{[0-9]+}}(%esp), %edi
; X86-NEXT: sete %bl
; X86-NEXT: negl %ebx
; X86-NEXT: movl %ebx, {{[0-9]+}}(%esp)
; X86-NEXT: xorl %ebx, %ebx
; X86-NEXT: cmpl {{[0-9]+}}(%esp), %esi
; X86-NEXT: sete %bl
; X86-NEXT: negl %ebx
; X86-NEXT: movl %ebx, {{[0-9]+}}(%esp)
; X86-NEXT: xorl %ebx, %ebx
; X86-NEXT: cmpl {{[0-9]+}}(%esp), %edx
; X86-NEXT: sete %bl
; X86-NEXT: negl %ebx
; X86-NEXT: movl %ebx, {{[0-9]+}}(%esp)
; X86-NEXT: xorl %edx, %edx
; X86-NEXT: cmpl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: sete %dl
; X86-NEXT: negl %edx
; X86-NEXT: movl %edx, (%esp)
; X86-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
; X86-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; X86-NEXT: unpcklps {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1]
; X86-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
; X86-NEXT: movss {{.*#+}} xmm2 = mem[0],zero,zero,zero
; X86-NEXT: unpcklps {{.*#+}} xmm2 = xmm2[0],xmm0[0],xmm2[1],xmm0[1]
; X86-NEXT: movlhps {{.*#+}} xmm2 = xmm2[0],xmm1[0]
; X86-NEXT: andps {{\.LCPI.*}}, %xmm2
; X86-NEXT: movaps %xmm2, (%eax)
; X86-NEXT: addl $16, %esp
; X86-NEXT: popl %esi
; X86-NEXT: popl %edi
; X86-NEXT: popl %ebx
; X86-NEXT: retl $4
;
; X64-LABEL: PR30512:
; X64: # %bb.0:
; X64-NEXT: movq %rdi, %rax
; X64-NEXT: xorl %edi, %edi
; X64-NEXT: cmpl {{[0-9]+}}(%rsp), %r8d
; X64-NEXT: sete %dil
; X64-NEXT: negl %edi
; X64-NEXT: movl %edi, -{{[0-9]+}}(%rsp)
; X64-NEXT: xorl %edi, %edi
; X64-NEXT: cmpl {{[0-9]+}}(%rsp), %ecx
; X64-NEXT: sete %dil
; X64-NEXT: negl %edi
; X64-NEXT: movl %edi, -{{[0-9]+}}(%rsp)
; X64-NEXT: xorl %ecx, %ecx
; X64-NEXT: cmpl {{[0-9]+}}(%rsp), %edx
; X64-NEXT: sete %cl
; X64-NEXT: negl %ecx
; X64-NEXT: movl %ecx, -{{[0-9]+}}(%rsp)
; X64-NEXT: xorl %ecx, %ecx
; X64-NEXT: cmpl %r9d, %esi
; X64-NEXT: sete %cl
; X64-NEXT: negl %ecx
; X64-NEXT: movl %ecx, -{{[0-9]+}}(%rsp)
; X64-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
; X64-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; X64-NEXT: unpcklps {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1]
; X64-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
; X64-NEXT: movss {{.*#+}} xmm2 = mem[0],zero,zero,zero
; X64-NEXT: unpcklps {{.*#+}} xmm2 = xmm2[0],xmm0[0],xmm2[1],xmm0[1]
; X64-NEXT: movlhps {{.*#+}} xmm2 = xmm2[0],xmm1[0]
; X64-NEXT: andps {{.*}}(%rip), %xmm2
; X64-NEXT: movaps %xmm2, (%rax)
; X64-NEXT: retq
%cmp = icmp eq <4 x i32> %x, %y
%zext = zext <4 x i1> %cmp to <4 x i32>
ret <4 x i32> %zext
}
; Fragile test warning - we need to induce the generation of a vselect
; post-legalization to cause the crash seen in:
; https://llvm.org/bugs/show_bug.cgi?id=31672
; Is there a way to do that without an unsafe/fast sqrt intrinsic call?
;
; We now no longer try to lower sqrt using rsqrt with SSE1 only as the
; v4i32 vselect mentioned above should never have been created. We ended up
; scalarizing it anyway.
define <2 x float> @PR31672() #0 {
; X86-LABEL: PR31672:
; X86: # %bb.0:
; X86-NEXT: sqrtps {{\.LCPI.*}}, %xmm0
; X86-NEXT: retl
;
; X64-LABEL: PR31672:
; X64: # %bb.0:
; X64-NEXT: sqrtps {{.*}}(%rip), %xmm0
; X64-NEXT: retq
%t0 = call fast <2 x float> @llvm.sqrt.v2f32(<2 x float> <float 42.0, float 3.0>)
ret <2 x float> %t0
}
declare <2 x float> @llvm.sqrt.v2f32(<2 x float>) #1
attributes #0 = { nounwind "unsafe-fp-math"="true" }
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