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[SelectionDAG] Add basic demanded elements support to ComputeNumSignBits for BITCAST nodes
Only adds support to the existing 'large element' scalar/vector to 'small element' vector bitcasts. The next step would be to support cases where the large elements aren't all sign bits, and determine the small element equivalent based on the demanded elements. llvm-svn: 340143
This commit is contained in:
Simon Pilgrim
parent
42be58650a
commit
255b336590
@ -3245,7 +3245,14 @@ unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, const APInt &DemandedElts,
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// Requires handling of DemandedElts and Endianness.
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if ((SrcBits % VTBits) == 0) {
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assert(Op.getValueType().isVector() && "Expected bitcast to vector");
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Tmp = ComputeNumSignBits(N0, Depth + 1);
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unsigned Scale = SrcBits / VTBits;
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APInt SrcDemandedElts(NumElts / Scale, 0);
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for (unsigned i = 0; i != NumElts; ++i)
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if (DemandedElts[i])
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SrcDemandedElts.setBit(i / Scale);
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Tmp = ComputeNumSignBits(N0, SrcDemandedElts, Depth + 1);
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if (Tmp == SrcBits)
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return VTBits;
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}
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@ -107,29 +107,25 @@ define <8 x i16> @trunc_ashr_v4i32_icmp_v4i32(<4 x i32> %a, <4 x i32> %b) nounwi
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define <8 x i16> @trunc_ashr_v4i64_demandedelts(<4 x i64> %a0) {
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; X86-SSE-LABEL: trunc_ashr_v4i64_demandedelts:
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; X86-SSE: # %bb.0:
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; X86-SSE-NEXT: movdqa %xmm0, %xmm2
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; X86-SSE-NEXT: psllq $63, %xmm2
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; X86-SSE-NEXT: movdqa %xmm0, %xmm3
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; X86-SSE-NEXT: movsd {{.*#+}} xmm3 = xmm2[0],xmm3[1]
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; X86-SSE-NEXT: movdqa %xmm1, %xmm2
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; X86-SSE-NEXT: psllq $63, %xmm2
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; X86-SSE-NEXT: movdqa %xmm1, %xmm4
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; X86-SSE-NEXT: movdqa %xmm1, %xmm3
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; X86-SSE-NEXT: movsd {{.*#+}} xmm3 = xmm2[0],xmm3[1]
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; X86-SSE-NEXT: movdqa %xmm0, %xmm2
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; X86-SSE-NEXT: psllq $63, %xmm2
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; X86-SSE-NEXT: movdqa %xmm0, %xmm4
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; X86-SSE-NEXT: movsd {{.*#+}} xmm4 = xmm2[0],xmm4[1]
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; X86-SSE-NEXT: psrlq $63, %xmm4
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; X86-SSE-NEXT: movsd {{.*#+}} xmm1 = xmm4[0],xmm1[1]
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; X86-SSE-NEXT: movsd {{.*#+}} xmm0 = xmm4[0],xmm0[1]
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; X86-SSE-NEXT: movapd {{.*#+}} xmm2 = [4.940656e-324,-0.000000e+00]
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; X86-SSE-NEXT: xorpd %xmm2, %xmm1
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; X86-SSE-NEXT: psubq %xmm2, %xmm1
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; X86-SSE-NEXT: psrlq $63, %xmm3
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; X86-SSE-NEXT: movsd {{.*#+}} xmm0 = xmm3[0],xmm0[1]
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; X86-SSE-NEXT: xorpd %xmm2, %xmm0
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; X86-SSE-NEXT: psubq %xmm2, %xmm0
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; X86-SSE-NEXT: pshufd {{.*#+}} xmm0 = xmm0[0,0,0,0]
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; X86-SSE-NEXT: psrlq $63, %xmm3
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; X86-SSE-NEXT: movsd {{.*#+}} xmm1 = xmm3[0],xmm1[1]
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; X86-SSE-NEXT: xorpd %xmm2, %xmm1
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; X86-SSE-NEXT: psubq %xmm2, %xmm1
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; X86-SSE-NEXT: pshufd {{.*#+}} xmm1 = xmm1[0,0,0,0]
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; X86-SSE-NEXT: pslld $16, %xmm1
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; X86-SSE-NEXT: psrad $16, %xmm1
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; X86-SSE-NEXT: pslld $16, %xmm0
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; X86-SSE-NEXT: psrad $16, %xmm0
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; X86-SSE-NEXT: pshufd {{.*#+}} xmm0 = xmm0[0,0,0,0]
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; X86-SSE-NEXT: packssdw %xmm1, %xmm0
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; X86-SSE-NEXT: retl
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;
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@ -151,10 +147,7 @@ define <8 x i16> @trunc_ashr_v4i64_demandedelts(<4 x i64> %a0) {
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; X86-AVX1-NEXT: vinsertf128 $1, %xmm0, %ymm1, %ymm0
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; X86-AVX1-NEXT: vpermilps {{.*#+}} ymm0 = ymm0[0,0,0,0,4,4,4,4]
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; X86-AVX1-NEXT: vextractf128 $1, %ymm0, %xmm1
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; X86-AVX1-NEXT: vmovdqa {{.*#+}} xmm2 = [0,1,4,5,8,9,12,13,8,9,12,13,12,13,14,15]
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; X86-AVX1-NEXT: vpshufb %xmm2, %xmm1, %xmm1
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; X86-AVX1-NEXT: vpshufb %xmm2, %xmm0, %xmm0
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; X86-AVX1-NEXT: vpunpcklqdq {{.*#+}} xmm0 = xmm0[0],xmm1[0]
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; X86-AVX1-NEXT: vpackssdw %xmm1, %xmm0, %xmm0
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; X86-AVX1-NEXT: vzeroupper
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; X86-AVX1-NEXT: retl
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;
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@ -167,37 +160,33 @@ define <8 x i16> @trunc_ashr_v4i64_demandedelts(<4 x i64> %a0) {
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; X86-AVX2-NEXT: vpxor %ymm2, %ymm0, %ymm0
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; X86-AVX2-NEXT: vpsrlvq %ymm1, %ymm0, %ymm0
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; X86-AVX2-NEXT: vpsubq %ymm3, %ymm0, %ymm0
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; X86-AVX2-NEXT: vpshufb {{.*#+}} ymm0 = ymm0[0,1,0,1,0,1,0,1,0,1,0,1,0,1,2,3,16,17,16,17,16,17,16,17,16,17,16,17,16,17,18,19]
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; X86-AVX2-NEXT: vpermq {{.*#+}} ymm0 = ymm0[0,2,2,3]
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; X86-AVX2-NEXT: # kill: def $xmm0 killed $xmm0 killed $ymm0
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; X86-AVX2-NEXT: vpshufd {{.*#+}} ymm0 = ymm0[0,0,0,0,4,4,4,4]
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; X86-AVX2-NEXT: vextracti128 $1, %ymm0, %xmm1
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; X86-AVX2-NEXT: vpackssdw %xmm1, %xmm0, %xmm0
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; X86-AVX2-NEXT: vzeroupper
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; X86-AVX2-NEXT: retl
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;
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; X64-SSE-LABEL: trunc_ashr_v4i64_demandedelts:
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; X64-SSE: # %bb.0:
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; X64-SSE-NEXT: movdqa %xmm0, %xmm2
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; X64-SSE-NEXT: psllq $63, %xmm2
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; X64-SSE-NEXT: movdqa %xmm0, %xmm3
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; X64-SSE-NEXT: movsd {{.*#+}} xmm3 = xmm2[0],xmm3[1]
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; X64-SSE-NEXT: movdqa %xmm1, %xmm2
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; X64-SSE-NEXT: psllq $63, %xmm2
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; X64-SSE-NEXT: movdqa %xmm1, %xmm4
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; X64-SSE-NEXT: movdqa %xmm1, %xmm3
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; X64-SSE-NEXT: movsd {{.*#+}} xmm3 = xmm2[0],xmm3[1]
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; X64-SSE-NEXT: movdqa %xmm0, %xmm2
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; X64-SSE-NEXT: psllq $63, %xmm2
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; X64-SSE-NEXT: movdqa %xmm0, %xmm4
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; X64-SSE-NEXT: movsd {{.*#+}} xmm4 = xmm2[0],xmm4[1]
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; X64-SSE-NEXT: psrlq $63, %xmm4
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; X64-SSE-NEXT: movsd {{.*#+}} xmm1 = xmm4[0],xmm1[1]
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; X64-SSE-NEXT: movsd {{.*#+}} xmm0 = xmm4[0],xmm0[1]
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; X64-SSE-NEXT: movapd {{.*#+}} xmm2 = [1,9223372036854775808]
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; X64-SSE-NEXT: xorpd %xmm2, %xmm1
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; X64-SSE-NEXT: psubq %xmm2, %xmm1
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; X64-SSE-NEXT: psrlq $63, %xmm3
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; X64-SSE-NEXT: movsd {{.*#+}} xmm0 = xmm3[0],xmm0[1]
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; X64-SSE-NEXT: xorpd %xmm2, %xmm0
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; X64-SSE-NEXT: psubq %xmm2, %xmm0
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; X64-SSE-NEXT: pshufd {{.*#+}} xmm0 = xmm0[0,0,0,0]
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; X64-SSE-NEXT: psrlq $63, %xmm3
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; X64-SSE-NEXT: movsd {{.*#+}} xmm1 = xmm3[0],xmm1[1]
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; X64-SSE-NEXT: xorpd %xmm2, %xmm1
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; X64-SSE-NEXT: psubq %xmm2, %xmm1
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; X64-SSE-NEXT: pshufd {{.*#+}} xmm1 = xmm1[0,0,0,0]
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; X64-SSE-NEXT: pslld $16, %xmm1
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; X64-SSE-NEXT: psrad $16, %xmm1
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; X64-SSE-NEXT: pslld $16, %xmm0
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; X64-SSE-NEXT: psrad $16, %xmm0
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; X64-SSE-NEXT: pshufd {{.*#+}} xmm0 = xmm0[0,0,0,0]
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; X64-SSE-NEXT: packssdw %xmm1, %xmm0
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; X64-SSE-NEXT: retq
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;
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@ -220,10 +209,7 @@ define <8 x i16> @trunc_ashr_v4i64_demandedelts(<4 x i64> %a0) {
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; X64-AVX1-NEXT: vinsertf128 $1, %xmm2, %ymm0, %ymm0
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; X64-AVX1-NEXT: vpermilps {{.*#+}} ymm0 = ymm0[0,0,0,0,4,4,4,4]
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; X64-AVX1-NEXT: vextractf128 $1, %ymm0, %xmm1
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; X64-AVX1-NEXT: vmovdqa {{.*#+}} xmm2 = [0,1,4,5,8,9,12,13,8,9,12,13,12,13,14,15]
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; X64-AVX1-NEXT: vpshufb %xmm2, %xmm1, %xmm1
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; X64-AVX1-NEXT: vpshufb %xmm2, %xmm0, %xmm0
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; X64-AVX1-NEXT: vpunpcklqdq {{.*#+}} xmm0 = xmm0[0],xmm1[0]
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; X64-AVX1-NEXT: vpackssdw %xmm1, %xmm0, %xmm0
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; X64-AVX1-NEXT: vzeroupper
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; X64-AVX1-NEXT: retq
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;
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@ -234,9 +220,9 @@ define <8 x i16> @trunc_ashr_v4i64_demandedelts(<4 x i64> %a0) {
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; X64-AVX2-NEXT: # ymm1 = mem[0,1,0,1]
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; X64-AVX2-NEXT: vpxor %ymm1, %ymm0, %ymm0
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; X64-AVX2-NEXT: vpsubq %ymm1, %ymm0, %ymm0
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; X64-AVX2-NEXT: vpshufb {{.*#+}} ymm0 = ymm0[0,1,0,1,0,1,0,1,0,1,0,1,0,1,2,3,16,17,16,17,16,17,16,17,16,17,16,17,16,17,18,19]
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; X64-AVX2-NEXT: vpermq {{.*#+}} ymm0 = ymm0[0,2,2,3]
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; X64-AVX2-NEXT: # kill: def $xmm0 killed $xmm0 killed $ymm0
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; X64-AVX2-NEXT: vpshufd {{.*#+}} ymm0 = ymm0[0,0,0,0,4,4,4,4]
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; X64-AVX2-NEXT: vextracti128 $1, %ymm0, %xmm1
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; X64-AVX2-NEXT: vpackssdw %xmm1, %xmm0, %xmm0
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; X64-AVX2-NEXT: vzeroupper
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; X64-AVX2-NEXT: retq
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%1 = shl <4 x i64> %a0, <i64 63, i64 0, i64 63, i64 0>
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