derek.holloway
7502bf64a4
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77 lines
2.5 KiB
LLVM
77 lines
2.5 KiB
LLVM
; RUN: llc -mtriple=hexagon -ifcvt-limit=0 -hexagon-initial-cfg-cleanup=0 < %s | FileCheck %s
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; Check if the branch probabilities are reflected in the instructions:
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; The basic block placement pass should place the more probable successor
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; block as the fall-through block. The unconditional jump in the predecessor
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; should then get the right hint (not_taken or ":nt")
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@j = external global i32
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define i32 @foo(i32 %a) nounwind {
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; CHECK: if (!p{{[0-3]}}.new) jump:nt
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entry:
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%tobool = icmp eq i32 %a, 0
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br i1 %tobool, label %if.else, label %if.then, !prof !0
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if.then: ; preds = %entry
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%add = add nsw i32 %a, 10
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%call = tail call i32 @foobar(i32 %add) nounwind
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br label %return
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if.else: ; preds = %entry
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%call2 = tail call i32 @foobar(i32 4) nounwind
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br label %return
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return: ; preds = %if.else, %if.then
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%retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ]
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ret i32 %retval.0
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}
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declare i32 @foobar(...)
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define i32 @bar(i32 %a) nounwind {
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; CHECK: if (p{{[0-3]}}.new) jump:nt
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entry:
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%tobool = icmp eq i32 %a, 0
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br i1 %tobool, label %if.else, label %if.then, !prof !1
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if.then: ; preds = %entry
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%add = add nsw i32 %a, 10
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%call = tail call i32 @foobar(i32 %add) nounwind
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br label %return
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if.else: ; preds = %entry
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%call2 = tail call i32 @foobar(i32 4) nounwind
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br label %return
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return: ; preds = %if.else, %if.then
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%retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ]
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ret i32 %retval.0
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}
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define i32 @foo_bar(i32 %a, i16 signext %b) nounwind {
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; CHECK: if (!cmp.eq(r{{[0-9]*}}.new,#0)) jump:nt
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entry:
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%0 = load i32, ptr @j, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %if.else, label %if.then, !prof !0
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if.then: ; preds = %entry
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%add = add nsw i32 %a, 10
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%call = tail call i32 @foobar(i32 %add) nounwind
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br label %return
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if.else: ; preds = %entry
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%add1 = add nsw i32 %a, 4
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%call2 = tail call i32 @foobar(i32 %add1) nounwind
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br label %return
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return: ; preds = %if.else, %if.then
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%retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ]
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ret i32 %retval.0
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}
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!0 = !{!"branch_weights", i32 64, i32 4}
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!1 = !{!"branch_weights", i32 4, i32 64}
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