a51f4afc5a
Currently, with hot cold splitting, when a cold region is identified, it is added to the region list of ColdBlocks. Then when another cold region (B) identified overlaps with a ColdBlocks region (A) already added to the list, the region B is not added to the list because of the overlapping with region A. The splitting analysis is performed, and the region A may not get split, for example, if it’s considered too expansive. This is to improve the handling the overlapping case when the region A is not considered good for splitting, while the region B is good for splitting. The change is to move the cold region splitting analysis earlier to allow more cold region splitting. If an identified region cannot be split, it will not be added to the candidate list of ColdBlocks for overlapping check.
54 lines
1.6 KiB
LLVM
54 lines
1.6 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -S -passes='function(instsimplify),hotcoldsplit' -hotcoldsplit-threshold=-1 -debug < %s 2>&1 | FileCheck %s
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; RUN: opt -passes='function(instcombine),hotcoldsplit,function(instsimplify)' %s -o /dev/null
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64"
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%a = type { i64, i64 }
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%b = type { i64 }
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; CHECK: @f
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; CHECK-LABEL: codeRepl:
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; CHECK-NOT: @llvm.assume
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; CHECK: }
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; CHECK: declare {{.*}}@llvm.assume
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; CHECK: define {{.*}}@f.cold.1(i64 %load1)
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; CHECK-LABEL: newFuncRoot:
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; CHECK: %cmp1 = icmp eq i64 %load1, 0
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; CHECK-NOT: call void @llvm.assume
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; CHECK: define {{.*}}@f.cold.2()
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; CHECK-LABEL: newFuncRoot:
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; CHECK: }
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define void @f() {
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entry:
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%i = getelementptr inbounds %a, ptr null, i64 0, i32 1
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br label %label
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label: ; preds = %entry
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%load0 = load ptr, ptr %i, align 8
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%i3 = getelementptr inbounds %b, ptr %load0, i64 undef, i32 0
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%load1 = load i64, ptr %i3, align 8
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%cmp0 = icmp ugt i64 %load1, 1
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br i1 %cmp0, label %if.then, label %if.else
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if.then: ; preds = %label
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unreachable
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if.else: ; preds = %label
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call void @g(ptr undef)
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%load2 = load i64, ptr undef, align 8
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%i7 = and i64 %load2, -16
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%i8 = inttoptr i64 %i7 to ptr
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%cmp1 = icmp eq i64 %load1, 0
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call void @llvm.assume(i1 %cmp1)
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unreachable
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}
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declare void @g(ptr)
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declare void @llvm.assume(i1 noundef) #0
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attributes #0 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite) }
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