bb6497ffa6
When using `BranchProbabilityPrinterPass`, if a BB has no name, we get pretty unusable information like `edge -> has probability...` (i.e. we have no idea what the vertices of that edge are). This patch uses `printAsOperand`, which uses the same naming scheme as `Function::dump`, so for example during debugging sessions, the IR obtained from a function and the names used by `BranchProbabilityPrinterPass` will match. A shortcoming is that `printAsOperand` will result in the numbering algorithm re-running for every edge and every vertex (when `BranchProbabilityPrinterPass` is run on a function). If, for the given scenario, this is a problem, we can revisit this subsequently. Another nuance is that the entry basic block will be numbered, which may be slightly confusing when it's anonymous, but it's easily identifiable - the first edge would have it as source (and the number should be easily recognizable)
104 lines
3.2 KiB
LLVM
104 lines
3.2 KiB
LLVM
; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s
|
|
|
|
@A = global i32 0, align 4
|
|
@B = global i32 0, align 4
|
|
|
|
; CHECK-LABEL: eq_opaque_minus_one
|
|
define void @eq_opaque_minus_one(ptr %base) {
|
|
entry:
|
|
%const = bitcast i32 -1 to i32
|
|
%tmp1 = load i32, ptr @B, align 4
|
|
br label %for.body
|
|
|
|
; CHECK: edge %for.body -> %if.then probability is 0x30000000 / 0x80000000 = 37.50%
|
|
; CHECK: edge %for.body -> %for.inc probability is 0x50000000 / 0x80000000 = 62.50%
|
|
for.body:
|
|
%tmp4 = phi i32 [ %tmp1, %entry ], [ %tmp7, %for.inc ]
|
|
%inc.iv = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
|
|
%storemerge176.in = getelementptr inbounds i32, ptr %base, i32 %inc.iv
|
|
%storemerge176 = load i32, ptr %storemerge176.in, align 4
|
|
store i32 %storemerge176, ptr @A, align 4
|
|
%cmp20 = icmp eq i32 %storemerge176, %const
|
|
br i1 %cmp20, label %if.then, label %for.inc
|
|
|
|
if.then:
|
|
%lnot.ext = zext i1 %cmp20 to i32
|
|
store i32 %lnot.ext, ptr @B, align 4
|
|
br label %for.inc
|
|
|
|
for.inc:
|
|
%tmp7 = phi i32 [ %tmp4, %for.body ], [ %lnot.ext, %if.then ]
|
|
%inc = add nuw nsw i32 %inc.iv, 1
|
|
%cmp9 = icmp ult i32 %inc, 401
|
|
br i1 %cmp9, label %for.body, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
; CHECK-LABEL: ne_opaque_minus_one
|
|
define void @ne_opaque_minus_one(ptr %base) {
|
|
entry:
|
|
%const = bitcast i32 -1 to i32
|
|
%tmp1 = load i32, ptr @B, align 4
|
|
br label %for.body
|
|
|
|
; CHECK: edge %for.body -> %if.then probability is 0x50000000 / 0x80000000 = 62.50%
|
|
; CHECK: edge %for.body -> %for.inc probability is 0x30000000 / 0x80000000 = 37.50%
|
|
for.body:
|
|
%tmp4 = phi i32 [ %tmp1, %entry ], [ %tmp7, %for.inc ]
|
|
%inc.iv = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
|
|
%storemerge176.in = getelementptr inbounds i32, ptr %base, i32 %inc.iv
|
|
%storemerge176 = load i32, ptr %storemerge176.in, align 4
|
|
store i32 %storemerge176, ptr @A, align 4
|
|
%cmp20 = icmp ne i32 %storemerge176, %const
|
|
br i1 %cmp20, label %if.then, label %for.inc
|
|
|
|
if.then:
|
|
%lnot.ext = zext i1 %cmp20 to i32
|
|
store i32 %lnot.ext, ptr @B, align 4
|
|
br label %for.inc
|
|
|
|
for.inc:
|
|
%tmp7 = phi i32 [ %tmp4, %for.body ], [ %lnot.ext, %if.then ]
|
|
%inc = add nuw nsw i32 %inc.iv, 1
|
|
%cmp9 = icmp ult i32 %inc, 401
|
|
br i1 %cmp9, label %for.body, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
; CHECK-LABEL: sgt_opaque_minus_one
|
|
define void @sgt_opaque_minus_one(ptr %base) {
|
|
entry:
|
|
%const = bitcast i32 -1 to i32
|
|
%tmp1 = load i32, ptr @B, align 4
|
|
br label %for.body
|
|
|
|
; CHECK: edge %for.body -> %if.then probability is 0x50000000 / 0x80000000 = 62.50%
|
|
; CHECK: edge %for.body -> %for.inc probability is 0x30000000 / 0x80000000 = 37.50%
|
|
for.body:
|
|
%tmp4 = phi i32 [ %tmp1, %entry ], [ %tmp7, %for.inc ]
|
|
%inc.iv = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
|
|
%storemerge176.in = getelementptr inbounds i32, ptr %base, i32 %inc.iv
|
|
%storemerge176 = load i32, ptr %storemerge176.in, align 4
|
|
store i32 %storemerge176, ptr @A, align 4
|
|
%cmp20 = icmp sgt i32 %storemerge176, %const
|
|
br i1 %cmp20, label %if.then, label %for.inc
|
|
|
|
if.then:
|
|
%lnot.ext = zext i1 %cmp20 to i32
|
|
store i32 %lnot.ext, ptr @B, align 4
|
|
br label %for.inc
|
|
|
|
for.inc:
|
|
%tmp7 = phi i32 [ %tmp4, %for.body ], [ %lnot.ext, %if.then ]
|
|
%inc = add nuw nsw i32 %inc.iv, 1
|
|
%cmp9 = icmp ult i32 %inc, 401
|
|
br i1 %cmp9, label %for.body, label %exit
|
|
|
|
exit:
|
|
ret void
|
|
}
|