1; RUN: opt < %s -instcombine -S | FileCheck %s 2 3declare <4 x float> @llvm.x86.vcvtph2ps.128(<8 x i16>) 4declare <8 x float> @llvm.x86.vcvtph2ps.256(<8 x i16>) 5 6; 7; Vector Demanded Bits 8; 9 10; Only bottom 4 elements required. 11define <4 x float> @demand_vcvtph2ps_128(<8 x i16> %A) { 12; CHECK-LABEL: @demand_vcvtph2ps_128 13; CHECK-NEXT: %1 = tail call <4 x float> @llvm.x86.vcvtph2ps.128(<8 x i16> %A) 14; CHECK-NEXT: ret <4 x float> %1 15 %1 = shufflevector <8 x i16> %A, <8 x i16> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 0, i32 1, i32 2, i32 3> 16 %2 = tail call <4 x float> @llvm.x86.vcvtph2ps.128(<8 x i16> %1) 17 ret <4 x float> %2 18} 19 20; All 8 elements required. 21define <8 x float> @demand_vcvtph2ps_256(<8 x i16> %A) { 22; CHECK-LABEL: @demand_vcvtph2ps_256 23; CHECK-NEXT: %1 = shufflevector <8 x i16> %A, <8 x i16> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 0, i32 1, i32 2, i32 3> 24; CHECK-NEXT: %2 = tail call <8 x float> @llvm.x86.vcvtph2ps.256(<8 x i16> %1) 25; CHECK-NEXT: ret <8 x float> %2 26 %1 = shufflevector <8 x i16> %A, <8 x i16> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 0, i32 1, i32 2, i32 3> 27 %2 = tail call <8 x float> @llvm.x86.vcvtph2ps.256(<8 x i16> %1) 28 ret <8 x float> %2 29} 30 31; 32; Constant Folding 33; 34 35define <4 x float> @fold_vcvtph2ps_128() { 36; CHECK-LABEL: @fold_vcvtph2ps_128 37; CHECK-NEXT: ret <4 x float> <float 0.000000e+00, float 5.000000e-01, float 1.000000e+00, float -0.000000e+00> 38 %1 = tail call <4 x float> @llvm.x86.vcvtph2ps.128(<8 x i16> <i16 0, i16 14336, i16 15360, i16 32768, i16 16384, i16 31743, i16 48128, i16 49152>) 39 ret <4 x float> %1 40} 41 42define <8 x float> @fold_vcvtph2ps_256() { 43; CHECK-LABEL: @fold_vcvtph2ps_256 44; CHECK-NEXT: ret <8 x float> <float 0.000000e+00, float 5.000000e-01, float 1.000000e+00, float -0.000000e+00, float 2.000000e+00, float 6.550400e+04, float -1.000000e+00, float -2.000000e+00> 45 %1 = tail call <8 x float> @llvm.x86.vcvtph2ps.256(<8 x i16> <i16 0, i16 14336, i16 15360, i16 32768, i16 16384, i16 31743, i16 48128, i16 49152>) 46 ret <8 x float> %1 47} 48 49define <4 x float> @fold_vcvtph2ps_128_zero() { 50; CHECK-LABEL: @fold_vcvtph2ps_128_zero 51; CHECK-NEXT: ret <4 x float> zeroinitializer 52 %1 = tail call <4 x float> @llvm.x86.vcvtph2ps.128(<8 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>) 53 ret <4 x float> %1 54} 55 56define <8 x float> @fold_vcvtph2ps_256_zero() { 57; CHECK-LABEL: @fold_vcvtph2ps_256_zero 58; CHECK-NEXT: ret <8 x float> zeroinitializer 59 %1 = tail call <8 x float> @llvm.x86.vcvtph2ps.256(<8 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>) 60 ret <8 x float> %1 61} 62