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1; RUN: llc < %s -mtriple=powerpc64le-unknown-linux-gnu -verify-machineinstrs -mcpu=pwr8 | FileCheck %s --check-prefixes=CHECK,CHECK-PWR82 3; Verify that we do NOT generate the mtctr instruction for loop trip counts < 44; The latency of the mtctr is only justified if there are more than 4 comparisons that are removed as a result.5 6@a = local_unnamed_addr global i32 0, align 47@b = local_unnamed_addr global i32 0, align 48@c = local_unnamed_addr global i32 0, align 49@d = local_unnamed_addr global i32 0, align 410@e = local_unnamed_addr global i32 0, align 411@f = local_unnamed_addr global i32 0, align 412@arr = local_unnamed_addr global [5 x i32] zeroinitializer, align 413 14; Function Attrs: norecurse nounwind readonly15define signext i32 @testTripCount2(i32 signext %a) {16 17; CHECK-LABEL: testTripCount2:18; CHECK-NOT: mtctr19; CHECK: blr20 21entry:22 br label %for.body23 24for.cond.cleanup: ; preds = %for.body25 ret i32 %add26 27for.body: ; preds = %entry, %for.body28 %indvars.iv = phi i64 [ 1, %entry ], [ %indvars.iv.next, %for.body ]29 %Sum.05 = phi i32 [ 0, %entry ], [ %add, %for.body ]30 %arrayidx = getelementptr inbounds [5 x i32], ptr @arr, i64 0, i64 %indvars.iv31 %0 = load i32, ptr %arrayidx, align 432 %add = add nsw i32 %0, %Sum.0533 %indvars.iv.next = add nsw i64 %indvars.iv, -134 %tobool = icmp eq i64 %indvars.iv, 035 br i1 %tobool, label %for.cond.cleanup, label %for.body36}37 38; Function Attrs: norecurse nounwind readonly39define signext i32 @testTripCount3(i32 signext %a) {40 41; CHECK-LABEL: testTripCount3:42; CHECK-NOT: mtctr43; CHECK: blr44 45entry:46 br label %for.body47 48for.cond.cleanup: ; preds = %for.body49 ret i32 %add50 51for.body: ; preds = %entry, %for.body52 %indvars.iv = phi i64 [ 2, %entry ], [ %indvars.iv.next, %for.body ]53 %Sum.05 = phi i32 [ 0, %entry ], [ %add, %for.body ]54 %arrayidx = getelementptr inbounds [5 x i32], ptr @arr, i64 0, i64 %indvars.iv55 %0 = load i32, ptr %arrayidx, align 456 %add = add nsw i32 %0, %Sum.0557 %indvars.iv.next = add nsw i64 %indvars.iv, -158 %tobool = icmp eq i64 %indvars.iv, 059 br i1 %tobool, label %for.cond.cleanup, label %for.body60}61 62; Function Attrs: norecurse nounwind readonly63 64define signext i32 @testTripCount4(i32 signext %a) {65 66; CHECK-LABEL: testTripCount4:67; CHECK: mtctr68; CHECK: bdnz69 70entry:71 br label %for.body72 73for.cond.cleanup: ; preds = %for.body74 ret i32 %add75 76for.body: ; preds = %entry, %for.body77 %indvars.iv = phi i64 [ 3, %entry ], [ %indvars.iv.next, %for.body ]78 %Sum.05 = phi i32 [ 0, %entry ], [ %add, %for.body ]79 %arrayidx = getelementptr inbounds [5 x i32], ptr @arr, i64 0, i64 %indvars.iv80 %0 = load i32, ptr %arrayidx, align 481 %add = add nsw i32 %0, %Sum.0582 %indvars.iv.next = add nsw i64 %indvars.iv, -183 %tobool = icmp eq i64 %indvars.iv, 084 br i1 %tobool, label %for.cond.cleanup, label %for.body85}86 87; Function Attrs: norecurse nounwind88define signext i32 @testTripCount2NonSmallLoop() {89; CHECK-LABEL: testTripCount2NonSmallLoop:90; CHECK-PWR8-NOT: mtctr91; CHECK: blr92 93entry:94 %.pre = load i32, ptr @a, align 495 br label %for.body96 97for.body: ; preds = %entry, %if.end98 %0 = phi i32 [ %.pre, %entry ], [ %1, %if.end ]99 %dec4 = phi i32 [ 1, %entry ], [ %dec, %if.end ]100 %b.03 = phi i8 [ 0, %entry ], [ %b.1, %if.end ]101 %tobool1 = icmp eq i32 %0, 0102 br i1 %tobool1, label %if.end, label %if.then103 104if.then: ; preds = %for.body105 store i32 2, ptr @a, align 4106 br label %if.end107 108if.end: ; preds = %for.body, %if.then109 %1 = phi i32 [ 2, %if.then ], [ 0, %for.body ]110 %b.1 = phi i8 [ 2, %if.then ], [ %b.03, %for.body ]111 %dec = add nsw i32 %dec4, -1112 %tobool = icmp eq i32 %dec4, 0113 br i1 %tobool, label %for.end, label %for.body114 115for.end: ; preds = %if.end116 %conv = zext i8 %b.1 to i32117 ret i32 %conv118}119 120define signext i32 @testTripCount5() {121; CHECK-LABEL: testTripCount5:122; CHECK-PWR8-NOT: mtctr123 124entry:125 %.prea = load i32, ptr @a, align 4126 %.preb = load i32, ptr @b, align 4127 %.prec = load i32, ptr @c, align 4128 %.pred = load i32, ptr @d, align 4129 %.pree = load i32, ptr @e, align 4130 %.pref = load i32, ptr @f, align 4131 br label %for.body132 133for.body: ; preds = %entry, %for.body134 %indvars.iv = phi i64 [ 2, %entry ], [ %indvars.iv.next, %for.body ]135 %0 = phi i32 [ %.prea, %entry ], [ %6, %for.body ]136 %1 = phi i32 [ %.preb, %entry ], [ %7, %for.body ]137 %2 = phi i32 [ %.prec, %entry ], [ %8, %for.body ]138 %3 = phi i32 [ %.pred, %entry ], [ %9, %for.body ]139 %4 = phi i32 [ %.pree, %entry ], [ %10, %for.body ]140 %5 = phi i32 [ %.pref, %entry ], [ %11, %for.body ]141 %6 = add i32 %0, 1142 %7 = add i32 %1, 1143 %8 = add i32 %2, 1144 %9 = add i32 %3, 1145 %10 = add i32 %4, 1146 %11 = add i32 %5, 1147 %indvars.iv.next = add nsw i64 %indvars.iv, -1148 %tobool = icmp eq i64 %indvars.iv, 0149 br i1 %tobool, label %for.end, label %for.body150 151for.end: ; preds = %for.body152 store i32 %6, ptr @a, align 4 153 store i32 %7, ptr @b, align 4 154 store i32 %8, ptr @c, align 4 155 store i32 %9, ptr @d, align 4 156 store i32 %10, ptr @e, align 4 157 store i32 %11, ptr @f, align 4 158 ret i32 0159}160 161