1 ; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux -asm-verbose=false | FileCheck %s 2 ; RUN: llc < %s -mcpu=generic -mtriple=x86_64-win32 -asm-verbose=false | FileCheck %s 3 4 ; LSR's OptimizeMax should eliminate the select (max). 5 6 ; CHECK-LABEL: foo: 7 ; CHECK-NOT: cmov 8 ; CHECK: jle 9 10 define void @foo(i64 %n, double* nocapture %p) nounwind { 11 entry: 12 %cmp6 = icmp slt i64 %n, 0 ; <i1> [#uses=1] 13 br i1 %cmp6, label %for.end, label %for.body.preheader 14 15 for.body.preheader: ; preds = %entry 16 %tmp = icmp sgt i64 %n, 0 ; <i1> [#uses=1] 17 %n.op = add i64 %n, 1 ; <i64> [#uses=1] 18 %tmp1 = select i1 %tmp, i64 %n.op, i64 1 ; <i64> [#uses=1] 19 br label %for.body 20 21 for.body: ; preds = %for.body.preheader, %for.body 22 %i = phi i64 [ %i.next, %for.body ], [ 0, %for.body.preheader ] ; <i64> [#uses=2] 23 %arrayidx = getelementptr double, double* %p, i64 %i ; <double*> [#uses=2] 24 %t4 = load double, double* %arrayidx ; <double> [#uses=1] 25 %mul = fmul double %t4, 2.200000e+00 ; <double> [#uses=1] 26 store double %mul, double* %arrayidx 27 %i.next = add nsw i64 %i, 1 ; <i64> [#uses=2] 28 %exitcond = icmp eq i64 %i.next, %tmp1 ; <i1> [#uses=1] 29 br i1 %exitcond, label %for.end, label %for.body 30 31 for.end: ; preds = %for.body, %entry 32 ret void 33 } 34 35 ; In this case, one of the max operands is another max, which folds, 36 ; leaving a two-operand max which doesn't fit the usual pattern. 37 ; OptimizeMax should handle this case. 38 ; PR7454 39 40 ; CHECK-LABEL: _Z18GenerateStatusPagei: 41 42 ; CHECK: jle 43 ; CHECK-NOT: cmov 44 ; CHECK: xorl {{%edi, %edi|%ecx, %ecx|%eax, %eax}} 45 ; CHECK-NEXT: align 46 ; CHECK-NEXT: BB1_2: 47 ; CHECK: callq 48 ; CHECK-NEXT: incl [[BX:%[a-z0-9]+]] 49 ; CHECK-NEXT: cmpl [[R14:%[a-z0-9]+]], [[BX]] 50 ; CHECK: jl 51 52 define void @_Z18GenerateStatusPagei(i32 %jobs_to_display) nounwind { 53 entry: 54 %cmp.i = icmp sgt i32 %jobs_to_display, 0 ; <i1> [#uses=1] 55 %tmp = select i1 %cmp.i, i32 %jobs_to_display, i32 0 ; <i32> [#uses=3] 56 %cmp8 = icmp sgt i32 %tmp, 0 ; <i1> [#uses=1] 57 br i1 %cmp8, label %bb.nph, label %for.end 58 59 bb.nph: ; preds = %entry 60 %tmp11 = icmp sgt i32 %tmp, 1 ; <i1> [#uses=1] 61 %smax = select i1 %tmp11, i32 %tmp, i32 1 ; <i32> [#uses=1] 62 br label %for.body 63 64 for.body: ; preds = %for.body, %bb.nph 65 %i.010 = phi i32 [ 0, %bb.nph ], [ %inc, %for.body ] ; <i32> [#uses=1] 66 %it.0.09 = phi float* [ null, %bb.nph ], [ %call.i, %for.body ] ; <float*> [#uses=1] 67 %call.i = call float* @_ZSt18_Rb_tree_decrementPKSt18_Rb_tree_node_base(float* %it.0.09) ; <float*> [#uses=1] 68 %inc = add nsw i32 %i.010, 1 ; <i32> [#uses=2] 69 %exitcond = icmp eq i32 %inc, %smax ; <i1> [#uses=1] 70 br i1 %exitcond, label %for.end, label %for.body 71 72 for.end: ; preds = %for.body, %entry 73 ret void 74 } 75 76 declare float* @_ZSt18_Rb_tree_decrementPKSt18_Rb_tree_node_base(float*) 77
