3279347da0
Constant hoisting may hide the constant value behind bitcast for And's operand. Track down the constant to make the BFI result consistent regardless of hoisting. Differential Revision: https://reviews.llvm.org/D91450
64 lines
2.4 KiB
LLVM
64 lines
2.4 KiB
LLVM
; RUN: opt < %s -analyze -branch-prob -enable-new-pm=0 | FileCheck %s
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; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s
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; CHECK-LABEL: no_hoist
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; CHECK: edge entry -> if.end probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> if.then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge if.end -> if.end4 probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge if.end -> if.then3 probability is 0x40000000 / 0x80000000 = 50.00%
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define dso_local void @no_hoist(i64 %arg1, i64 %arg2) local_unnamed_addr #0 {
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entry:
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%and = and i64 %arg1, 1152921504606846976
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%tobool.not = icmp eq i64 %and, 0
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br i1 %tobool.not, label %if.end, label %if.then
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if.then: ; preds = %entry
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tail call void @bar()
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%and1 = and i64 %arg2, 1152921504606846976
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%tobool2.not = icmp eq i64 %and1, 0
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br i1 %tobool2.not, label %if.end4, label %if.then3
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if.then3: ; preds = %if.end
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tail call void @baz()
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br label %if.end4
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if.end4: ; preds = %if.then3, %if.end
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ret void
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}
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; CHECK-LABEL: hoist
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; CHECK: edge entry -> if.end probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> if.then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge if.end -> if.end4 probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge if.end -> if.then3 probability is 0x40000000 / 0x80000000 = 50.00%
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define dso_local void @hoist(i64 %arg1, i64 %arg2) local_unnamed_addr #0 {
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entry:
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%const = bitcast i64 1152921504606846976 to i64
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%and = and i64 %arg1, %const
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%tobool.not = icmp eq i64 %and, 0
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br i1 %tobool.not, label %if.end, label %if.then
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if.then: ; preds = %entry
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tail call void @bar()
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%and1 = and i64 %arg2, %const
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%tobool2.not = icmp eq i64 %and1, 0
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br i1 %tobool2.not, label %if.end4, label %if.then3
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if.then3: ; preds = %if.end
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tail call void @baz()
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br label %if.end4
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if.end4: ; preds = %if.then3, %if.end
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ret void
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}
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declare dso_local void @bar() local_unnamed_addr #1
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declare dso_local void @baz() local_unnamed_addr #1
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