Home | History | Annotate | Download | only in X86
      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