1 ; RUN: llc -march=hexagon -mcpu=hexagonv4 < %s | FileCheck %s 2 3 ; Check if the branch probabilities are reflected in the instructions: 4 ; The basic block placement pass should place the more probable successor 5 ; block as the fall-through block. The unconditional jump in the predecessor 6 ; should then get the right hint (not_taken or ":nt") 7 8 9 @j = external global i32 10 11 define i32 @foo(i32 %a) nounwind { 12 ; CHECK: if{{ *}}(!p{{[0-3]}}.new) jump:nt 13 entry: 14 %tobool = icmp eq i32 %a, 0 15 br i1 %tobool, label %if.else, label %if.then, !prof !0 16 17 if.then: ; preds = %entry 18 %add = add nsw i32 %a, 10 19 %call = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 %add) nounwind 20 br label %return 21 22 if.else: ; preds = %entry 23 %call2 = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 4) nounwind 24 br label %return 25 26 return: ; preds = %if.else, %if.then 27 %retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ] 28 ret i32 %retval.0 29 } 30 31 declare i32 @foobar(...) 32 33 define i32 @bar(i32 %a) nounwind { 34 ; CHECK: if{{ *}}(p{{[0-3]}}.new) jump:nt 35 entry: 36 %tobool = icmp eq i32 %a, 0 37 br i1 %tobool, label %if.else, label %if.then, !prof !1 38 39 if.then: ; preds = %entry 40 %add = add nsw i32 %a, 10 41 %call = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 %add) nounwind 42 br label %return 43 44 if.else: ; preds = %entry 45 %call2 = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 4) nounwind 46 br label %return 47 48 return: ; preds = %if.else, %if.then 49 %retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ] 50 ret i32 %retval.0 51 } 52 53 define i32 @foo_bar(i32 %a, i16 signext %b) nounwind { 54 ; CHECK: if{{ *}}(!cmp.eq(r{{[0-9]*}}.new, #0)) jump:nt 55 entry: 56 %0 = load i32, i32* @j, align 4 57 %tobool = icmp eq i32 %0, 0 58 br i1 %tobool, label %if.else, label %if.then, !prof !0 59 60 if.then: ; preds = %entry 61 %add = add nsw i32 %a, 10 62 %call = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 %add) nounwind 63 br label %return 64 65 if.else: ; preds = %entry 66 %add1 = add nsw i32 %a, 4 67 %call2 = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 %add1) nounwind 68 br label %return 69 70 return: ; preds = %if.else, %if.then 71 %retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ] 72 ret i32 %retval.0 73 } 74 75 !0 = !{!"branch_weights", i32 64, i32 4} 76 !1 = !{!"branch_weights", i32 4, i32 64} 77
