45 lines
1.5 KiB
LLVM
45 lines
1.5 KiB
LLVM
; RUN: llc -mtriple=arm-apple-ios -print-machineinstrs=branch-folder \
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; RUN: %s -o /dev/null 2>&1 | FileCheck %s
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; Branch probability of tailed-merged block:
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;
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; p(L0_L1 -> L2) = p(entry -> L0) * p(L0 -> L2) + p(entry -> L1) * p(L1 -> L2)
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; = 0.2 * 0.6 + 0.8 * 0.3 = 0.36
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; p(L0_L1 -> L3) = p(entry -> L0) * p(L0 -> L3) + p(entry -> L1) * p(L1 -> L3)
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; = 0.2 * 0.4 + 0.8 * 0.7 = 0.64
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; CHECK: # Machine code for function test0:
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; CHECK: Successors according to CFG: BB#{{[0-9]+}}(13) BB#{{[0-9]+}}(24)
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; CHECK: BB#{{[0-9]+}}:
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; CHECK: BB#{{[0-9]+}}:
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; CHECK: # End machine code for function test0.
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define i32 @test0(i32 %n, i32 %m, i32* nocapture %a, i32* nocapture %b) {
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entry:
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%cmp = icmp sgt i32 %n, 0
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br i1 %cmp, label %L0, label %L1, !prof !0
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L0: ; preds = %entry
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store i32 12, i32* %a, align 4
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store i32 18, i32* %b, align 4
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%cmp1 = icmp eq i32 %m, 8
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br i1 %cmp1, label %L2, label %L3, !prof !1
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L1: ; preds = %entry
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store i32 14, i32* %a, align 4
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store i32 18, i32* %b, align 4
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%cmp3 = icmp eq i32 %m, 8
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br i1 %cmp3, label %L2, label %L3, !prof !2
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L2: ; preds = %L1, %L0
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br label %L3
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L3: ; preds = %L0, %L1, %L2
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%retval.0 = phi i32 [ 100, %L2 ], [ 6, %L1 ], [ 6, %L0 ]
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ret i32 %retval.0
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}
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!0 = !{!"branch_weights", i32 200, i32 800}
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!1 = !{!"branch_weights", i32 600, i32 400}
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!2 = !{!"branch_weights", i32 300, i32 700}
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