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6342812033
the case of multiple edges from one block to another. A simple example is a switch statement with multiple values to the same destination. The definition of an edge is modified from a pair of blocks to a pair of PredBlock and an index into the successors. Also set the weight correctly when building SelectionDAG from LLVM IR, especially when converting a Switch. IntegersSubsetMapping is updated to calculate the weight for each cluster. llvm-svn: 162572
118 lines
3.2 KiB
LLVM
118 lines
3.2 KiB
LLVM
; RUN: opt < %s -analyze -branch-prob | FileCheck %s
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define i32 @test1(i32 %i, i32* %a) {
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; CHECK: Printing analysis {{.*}} for function 'test1'
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entry:
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br label %body
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; CHECK: edge entry -> body probability is 16 / 16 = 100%
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body:
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%iv = phi i32 [ 0, %entry ], [ %next, %body ]
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%base = phi i32 [ 0, %entry ], [ %sum, %body ]
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%arrayidx = getelementptr inbounds i32* %a, i32 %iv
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%0 = load i32* %arrayidx
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%sum = add nsw i32 %0, %base
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%next = add i32 %iv, 1
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%exitcond = icmp eq i32 %next, %i
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br i1 %exitcond, label %exit, label %body
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; CHECK: edge body -> exit probability is 4 / 128
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; CHECK: edge body -> body probability is 124 / 128
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exit:
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ret i32 %sum
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}
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define i32 @test2(i32 %i, i32 %a, i32 %b) {
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; CHECK: Printing analysis {{.*}} for function 'test2'
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entry:
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%cond = icmp ult i32 %i, 42
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br i1 %cond, label %then, label %else, !prof !0
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; CHECK: edge entry -> then probability is 64 / 68
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; CHECK: edge entry -> else probability is 4 / 68
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 16 / 16 = 100%
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 16 / 16 = 100%
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exit:
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%result = phi i32 [ %a, %then ], [ %b, %else ]
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ret i32 %result
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}
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!0 = metadata !{metadata !"branch_weights", i32 64, i32 4}
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define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
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; CHECK: Printing analysis {{.*}} for function 'test3'
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entry:
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switch i32 %i, label %case_a [ i32 1, label %case_b
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i32 2, label %case_c
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i32 3, label %case_d
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i32 4, label %case_e ], !prof !1
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; CHECK: edge entry -> case_a probability is 4 / 80
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; CHECK: edge entry -> case_b probability is 4 / 80
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; CHECK: edge entry -> case_c probability is 64 / 80
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; CHECK: edge entry -> case_d probability is 4 / 80
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; CHECK: edge entry -> case_e probability is 4 / 80
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case_a:
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br label %exit
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; CHECK: edge case_a -> exit probability is 16 / 16 = 100%
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case_b:
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br label %exit
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; CHECK: edge case_b -> exit probability is 16 / 16 = 100%
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case_c:
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br label %exit
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; CHECK: edge case_c -> exit probability is 16 / 16 = 100%
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case_d:
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br label %exit
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; CHECK: edge case_d -> exit probability is 16 / 16 = 100%
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case_e:
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br label %exit
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; CHECK: edge case_e -> exit probability is 16 / 16 = 100%
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exit:
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%result = phi i32 [ %a, %case_a ],
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[ %b, %case_b ],
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[ %c, %case_c ],
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[ %d, %case_d ],
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[ %e, %case_e ]
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ret i32 %result
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}
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!1 = metadata !{metadata !"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4}
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define i32 @test4(i32 %x) nounwind uwtable readnone ssp {
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; CHECK: Printing analysis {{.*}} for function 'test4'
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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 2, label %sw.bb
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i64 5, label %sw.bb1
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], !prof !2
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; CHECK: edge entry -> return probability is 7 / 85
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; CHECK: edge entry -> sw.bb probability is 14 / 85
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; CHECK: edge entry -> sw.bb1 probability is 64 / 85
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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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!2 = metadata !{metadata !"branch_weights", i32 7, i32 6, i32 4, i32 4, i32 64}
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