1; RUN: llc < %s | FileCheck %s 2; 3; Generated with clang -O2 -S -emit-llvm 4; 5; /* Test 1 */ 6; extern "C" bool bar (long double); 7; __attribute__((optnone)) 8; extern "C" bool foo(long double x, long double y) 9; { 10; return (x == y) || (bar(x)); 11; } 12; 13; /* Test 2 */ 14; struct FVector { 15; float x, y, z; 16; inline __attribute__((always_inline)) FVector(float f): x(f), y(f), z(f) {} 17; inline __attribute__((always_inline)) FVector func(float p) const 18; { 19; if( x == 1.f ) { 20; return *this; 21; } else if( x < p ) { 22; return FVector(0.f); 23; } 24; return FVector(x); 25; } 26; }; 27; 28; __attribute__((optnone)) 29; int main() 30; { 31; FVector v(1.0); 32; v = v.func(1.e-8); 33; return 0; 34; } 35; 36; ModuleID = 'test.cpp' 37target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 38target triple = "x86_64-unknown-linux-gnu" 39 40%struct.FVector = type { float, float, float } 41 42define zeroext i1 @foo(x86_fp80 %x, x86_fp80 %y) noinline optnone { 43entry: 44 %x.addr = alloca x86_fp80, align 16 45 %y.addr = alloca x86_fp80, align 16 46 store x86_fp80 %x, x86_fp80* %x.addr, align 16 47 store x86_fp80 %y, x86_fp80* %y.addr, align 16 48 %0 = load x86_fp80, x86_fp80* %x.addr, align 16 49 %1 = load x86_fp80, x86_fp80* %y.addr, align 16 50 %cmp = fcmp oeq x86_fp80 %0, %1 51 52; Test 1 53; Make sure that there is no dead code generated 54; from Fast-ISel Phi-node handling. We should only 55; see one movb of the constant 1, feeding the PHI 56; node in lor.end. This covers the code path with 57; handlePHINodesInSuccessorBlocks() returning true. 58; 59; CHECK-LABEL: foo: 60; CHECK: movb $1, 61; CHECK-NOT: movb $1, 62; CHECK-LABEL: .LBB0_1: 63 64 br i1 %cmp, label %lor.end, label %lor.rhs 65 66lor.rhs: ; preds = %entry 67 %2 = load x86_fp80, x86_fp80* %x.addr, align 16 68 %call = call zeroext i1 @bar(x86_fp80 %2) 69 br label %lor.end 70 71lor.end: ; preds = %lor.rhs, %entry 72 %3 = phi i1 [ true, %entry ], [ %call, %lor.rhs ] 73 ret i1 %3 74} 75 76declare zeroext i1 @bar(x86_fp80) 77 78define i32 @main() noinline optnone { 79entry: 80 %retval = alloca i32, align 4 81 %v = alloca %struct.FVector, align 4 82 %ref.tmp = alloca %struct.FVector, align 4 83 %tmp = alloca { <2 x float>, float }, align 8 84 store i32 0, i32* %retval, align 4 85 %0 = bitcast %struct.FVector* %v to i8* 86 call void @llvm.lifetime.start(i64 12, i8* %0) nounwind 87 %x.i = getelementptr inbounds %struct.FVector, %struct.FVector* %v, i64 0, i32 0 88 store float 1.000000e+00, float* %x.i, align 4 89 %y.i = getelementptr inbounds %struct.FVector, %struct.FVector* %v, i64 0, i32 1 90 store float 1.000000e+00, float* %y.i, align 4 91 %z.i = getelementptr inbounds %struct.FVector, %struct.FVector* %v, i64 0, i32 2 92 store float 1.000000e+00, float* %z.i, align 4 93 %x.i.1 = getelementptr inbounds %struct.FVector, %struct.FVector* %v, i64 0, i32 0 94 %1 = load float, float* %x.i.1, align 4 95 %cmp.i = fcmp oeq float %1, 1.000000e+00 96 br i1 %cmp.i, label %if.then.i, label %if.else.i 97 98if.then.i: ; preds = %entry 99 %retval.sroa.0.0..sroa_cast.i = bitcast %struct.FVector* %v to <2 x float>* 100 %retval.sroa.0.0.copyload.i = load <2 x float>, <2 x float>* %retval.sroa.0.0..sroa_cast.i, align 4 101 %retval.sroa.6.0..sroa_idx16.i = getelementptr inbounds %struct.FVector, %struct.FVector* %v, i64 0, i32 2 102 %retval.sroa.6.0.copyload.i = load float, float* %retval.sroa.6.0..sroa_idx16.i, align 4 103 br label %func.exit 104 105if.else.i: ; preds = %entry 106 107; Test 2 108; In order to feed the first PHI node in func.exit handlePHINodesInSuccessorBlocks() 109; generates a local value instruction, but it cannot handle the second PHI node and 110; returns false to let SelectionDAGISel handle both cases. Make sure the generated 111; local value instruction is removed. 112; CHECK-LABEL: main: 113; CHECK-LABEL: .LBB1_2: 114; CHECK: xorps [[REG:%xmm[0-7]]], [[REG]] 115; CHECK-NOT: xorps [[REG]], [[REG]] 116; CHECK-LABEL: .LBB1_3: 117 118 %cmp3.i = fcmp olt float %1, 0x3E45798EE0000000 119 br i1 %cmp3.i, label %func.exit, label %if.end.5.i 120 121if.end.5.i: ; preds = %if.else.i 122 %retval.sroa.0.0.vec.insert13.i = insertelement <2 x float> undef, float %1, i32 0 123 %retval.sroa.0.4.vec.insert15.i = insertelement <2 x float> %retval.sroa.0.0.vec.insert13.i, float %1, i32 1 124 br label %func.exit 125 126func.exit: ; preds = %if.then.i, %if.else.i, %if.end.5.i 127 %retval.sroa.6.0.i = phi float [ %retval.sroa.6.0.copyload.i, %if.then.i ], [ %1, %if.end.5.i ], [ 0.000000e+00, %if.else.i ] 128 %retval.sroa.0.0.i = phi <2 x float> [ %retval.sroa.0.0.copyload.i, %if.then.i ], [ %retval.sroa.0.4.vec.insert15.i, %if.end.5.i ], [ zeroinitializer, %if.else.i ] 129 %.fca.0.insert.i = insertvalue { <2 x float>, float } undef, <2 x float> %retval.sroa.0.0.i, 0 130 %.fca.1.insert.i = insertvalue { <2 x float>, float } %.fca.0.insert.i, float %retval.sroa.6.0.i, 1 131 store { <2 x float>, float } %.fca.1.insert.i, { <2 x float>, float }* %tmp, align 8 132 %2 = bitcast { <2 x float>, float }* %tmp to i8* 133 %3 = bitcast %struct.FVector* %ref.tmp to i8* 134 call void @llvm.memcpy.p0i8.p0i8.i64(i8* %3, i8* %2, i64 12, i32 4, i1 false) 135 %4 = bitcast %struct.FVector* %v to i8* 136 %5 = bitcast %struct.FVector* %ref.tmp to i8* 137 call void @llvm.memcpy.p0i8.p0i8.i64(i8* %4, i8* %5, i64 12, i32 4, i1 false) 138 %6 = bitcast %struct.FVector* %v to i8* 139 call void @llvm.lifetime.end(i64 12, i8* %6) nounwind 140 ret i32 0 141} 142 143declare void @llvm.lifetime.start(i64, i8* nocapture) argmemonly nounwind 144 145declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) argmemonly nounwind 146 147declare void @llvm.lifetime.end(i64, i8* nocapture) argmemonly nounwind 148