derek.holloway
7502bf64a4
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67 lines
2.0 KiB
LLVM
67 lines
2.0 KiB
LLVM
; RUN: llc -fast-isel -stop-after=codegenprepare -mtriple=x86_64-unknown-linux-gnu -o - < %s | FileCheck %s
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; Verify that CodeGenPrepare::splitBranchCondition installs the freshly
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; computed (and scaled) branch weights on the two resulting branches.
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;
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; For an `or` of two conditions with original weights (A, B), the comment
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; in splitBranchCondition prescribes:
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; Br1 weights = (A, A + 2*B)
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; Br2 weights = (A, 2*B)
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;
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; For an `and` of two conditions with original weights (A, B):
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; Br1 weights = (2*A + B, B)
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; Br2 weights = (2*A, B)
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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declare void @a()
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declare void @b()
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; CHECK-LABEL: define void @split_or
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; CHECK: br i1 %c1, label %t, label %entry.cond.split, !prof [[OR_BR1:![0-9]+]]
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; CHECK: br i1 %c2, label %t, label %f, !prof [[OR_BR2:![0-9]+]]
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define void @split_or(i32 %x, i32 %y) {
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entry:
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%c1 = icmp eq i32 %x, 0
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%c2 = icmp eq i32 %y, 0
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%or = or i1 %c1, %c2
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br i1 %or, label %t, label %f, !prof !0
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t:
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call void @a()
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ret void
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f:
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call void @b()
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ret void
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}
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; CHECK-LABEL: define void @split_and
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; CHECK: br i1 %c1, label %entry.cond.split, label %f, !prof [[AND_BR1:![0-9]+]]
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; CHECK: br i1 %c2, label %t, label %f, !prof [[AND_BR2:![0-9]+]]
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define void @split_and(i32 %x, i32 %y) {
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entry:
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%c1 = icmp eq i32 %x, 0
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%c2 = icmp eq i32 %y, 0
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%and = and i1 %c1, %c2
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br i1 %and, label %t, label %f, !prof !0
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t:
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call void @a()
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ret void
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f:
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call void @b()
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ret void
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}
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!0 = !{!"branch_weights", i32 100, i32 7}
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; Expected freshly-computed weights:
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; OR Br1: (100, 100 + 2*7) = (100, 114)
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; OR Br2: (100, 2*7) = (100, 14)
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; AND Br1: (2*100 + 7, 7) = (207, 7)
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; AND Br2: (2*100, 7) = (200, 7)
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; CHECK-DAG: [[OR_BR1]] = !{!"branch_weights", i32 100, i32 114}
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; CHECK-DAG: [[OR_BR2]] = !{!"branch_weights", i32 100, i32 14}
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; CHECK-DAG: [[AND_BR1]] = !{!"branch_weights", i32 207, i32 7}
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; CHECK-DAG: [[AND_BR2]] = !{!"branch_weights", i32 200, i32 7}
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