1; RUN: opt < %s -S -instcombine | FileCheck %s 2@A = extern_weak global i32, align 4 3@B = extern_weak global i32, align 4 4 5define i32 @foo(i1 %which) { 6entry: 7 br i1 %which, label %final, label %delay 8 9delay: 10 br label %final 11 12; CHECK-LABEL: @foo 13; CHECK-LABEL: final: 14; CHECK: phi i32 [ 1, %entry ], [ select (i1 icmp eq (i32* @A, i32* @B), i32 2, i32 1), %delay ] 15final: 16 %use2 = phi i1 [ false, %entry ], [ icmp eq (i32* @A, i32* @B), %delay ] 17 %value = select i1 %use2, i32 2, i32 1 18 ret i32 %value 19} 20 21 22; test folding of select into phi for vectors. 23define <4 x i64> @vec1(i1 %which) { 24entry: 25 br i1 %which, label %final, label %delay 26 27delay: 28 br label %final 29 30final: 31; CHECK-LABEL: @vec1 32; CHECK-LABEL: final: 33; CHECK: %phinode = phi <4 x i64> [ zeroinitializer, %entry ], [ <i64 0, i64 0, i64 126, i64 127>, %delay ] 34; CHECK-NOT: select 35; CHECK: ret <4 x i64> %phinode 36 %phinode = phi <4 x i1> [ <i1 true, i1 true, i1 true, i1 true>, %entry ], [ <i1 true, i1 true, i1 false, i1 false>, %delay ] 37 %sel = select <4 x i1> %phinode, <4 x i64> zeroinitializer, <4 x i64> <i64 124, i64 125, i64 126, i64 127> 38 ret <4 x i64> %sel 39} 40 41define <4 x i64> @vec2(i1 %which) { 42entry: 43 br i1 %which, label %final, label %delay 44 45delay: 46 br label %final 47 48final: 49; CHECK-LABEL: @vec2 50; CHECK-LABEL: final: 51; CHECK: %phinode = phi <4 x i64> [ <i64 124, i64 125, i64 126, i64 127>, %entry ], [ <i64 0, i64 125, i64 0, i64 127>, %delay ] 52; CHECK-NOT: select 53; CHECK: ret <4 x i64> %phinode 54 %phinode = phi <4 x i1> [ <i1 false, i1 false, i1 false, i1 false>, %entry ], [ <i1 true, i1 false, i1 true, i1 false>, %delay ] 55 %sel = select <4 x i1> %phinode, <4 x i64> zeroinitializer, <4 x i64> <i64 124, i64 125, i64 126, i64 127> 56 ret <4 x i64> %sel 57} 58 59; Test PR33364 60; Insert the generated select into the same block as the incoming phi value. 61; phi has constant vectors along with a single non-constant vector as operands. 62define <2 x i8> @vec3(i1 %cond1, i1 %cond2, <2 x i1> %x, <2 x i8> %y, <2 x i8> %z) { 63; CHECK-LABEL: @vec3 64; CHECK: entry: 65; CHECK-NEXT: [[PHITMP1:%.*]] = shufflevector <2 x i8> %y, <2 x i8> %z, <2 x i32> <i32 2, i32 1> 66entry: 67 br i1 %cond1, label %if1, label %else 68 69; CHECK: if1: 70; CHECK-NEXT: [[PHITMP2:%.*]] = shufflevector <2 x i8> %y, <2 x i8> %z, <2 x i32> <i32 0, i32 3> 71if1: 72 br i1 %cond2, label %if2, label %else 73 74; CHECK: if2: 75; CHECK-NEXT: [[PHITMP3:%.*]] = select <2 x i1> %x, <2 x i8> %y, <2 x i8> %z 76if2: 77 br label %else 78 79; CHECK: else: 80; CHECK-NEXT: [[PHITMP4:%.*]] = phi <2 x i8> [ [[PHITMP3]], %if2 ], [ [[PHITMP1]], %entry ], [ [[PHITMP2]], %if1 ] 81; CHECK-NEXT: ret <2 x i8> [[PHITMP4]] 82else: 83 %phi = phi <2 x i1> [ %x, %if2 ], [ <i1 0, i1 1>, %entry ], [ <i1 1, i1 0>, %if1 ] 84 %sel = select <2 x i1> %phi, <2 x i8> %y, <2 x i8> %z 85 ret <2 x i8> %sel 86} 87