75 lines
2.1 KiB
LLVM
75 lines
2.1 KiB
LLVM
; RUN: llc < %s -print-machineinstrs=expand-isel-pseudos -o /dev/null 2>&1 | FileCheck %s
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; ARM & AArch64 run an extra SimplifyCFG which disrupts this test.
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; Hexagon crashes (PR23377)
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; XFAIL: arm,aarch64,hexagon
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; Make sure we have the correct weight attached to each successor.
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define i32 @test2(i32 %x) nounwind uwtable readnone ssp {
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; CHECK-LABEL: Machine code for function test2:
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entry:
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%conv = sext i32 %x to i64
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switch i64 %conv, label %return [
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i64 0, label %sw.bb
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i64 1, label %sw.bb
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i64 4, label %sw.bb
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i64 5, label %sw.bb1
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], !prof !0
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; CHECK: BB#0: derived from LLVM BB %entry
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; CHECK: Successors according to CFG: BB#2(64) BB#4(21)
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; CHECK: BB#4: derived from LLVM BB %entry
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; CHECK: Successors according to CFG: BB#1(10) BB#5(11)
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; CHECK: BB#5: derived from LLVM BB %entry
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; CHECK: Successors according to CFG: BB#1(4) BB#3(7)
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sw.bb:
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br label %return
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sw.bb1:
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br label %return
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return:
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%retval.0 = phi i32 [ 5, %sw.bb1 ], [ 1, %sw.bb ], [ 0, %entry ]
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ret i32 %retval.0
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}
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!0 = !{!"branch_weights", i32 7, i32 6, i32 4, i32 4, i32 64}
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declare void @g(i32)
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define void @left_leaning_weight_balanced_tree(i32 %x) {
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entry:
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switch i32 %x, label %return [
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i32 0, label %bb0
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i32 10, label %bb1
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i32 20, label %bb2
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i32 30, label %bb3
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i32 40, label %bb4
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i32 50, label %bb5
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], !prof !1
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bb0: tail call void @g(i32 0) br label %return
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bb1: tail call void @g(i32 1) br label %return
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bb2: tail call void @g(i32 2) br label %return
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bb3: tail call void @g(i32 3) br label %return
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bb4: tail call void @g(i32 4) br label %return
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bb5: tail call void @g(i32 5) br label %return
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return: ret void
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; Check that we set branch weights on the pivot cmp instruction correctly.
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; Cases {0,10,20,30} go on the left with weight 13; cases {40,50} go on the
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; right with weight 20.
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;
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; CHECK-LABEL: Machine code for function left_leaning_weight_balanced_tree:
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; CHECK: BB#0: derived from LLVM BB %entry
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; CHECK-NOT: Successors
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; CHECK: Successors according to CFG: BB#8(13) BB#9(20)
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}
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!1 = !{!"branch_weights",
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; Default:
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i32 1,
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; Case 0, 10, 20:
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i32 10, i32 1, i32 1,
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; Case 30, 40, 50:
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i32 1, i32 10, i32 10}
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