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.
53 lines
1.5 KiB
LLVM
53 lines
1.5 KiB
LLVM
; RUN: opt -S -passes=hotcoldsplit -hotcoldsplit-threshold=2 < %s | FileCheck %s
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target datalayout = "E-m:a-p:32:32-i64:64-n32"
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target triple = "powerpc64-ibm-aix7.2.0.0"
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define void @foo(i32 %cond, i32 %s0, i32 %s1) {
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; CHECK-LABEL: define {{.*}}@foo(
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; CHECK: br i1 {{.*}}, label %codeRepl, label %if.end2
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; CHECK-LABEL: codeRepl:
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; CHECK-NEXT: call void @foo.cold.1
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; CHECK-LABEL: if.end2:
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; CHECK: call void @sideeffect
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;
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entry:
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%cond.addr = alloca i32
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store i32 %cond, ptr %cond.addr
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%0 = load i32, ptr %cond.addr
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%tobool = icmp ne i32 %0, 0
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br i1 %tobool, label %if.then, label %if.end2
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if.then: ; preds = %entry
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%1 = load i32, ptr %cond.addr
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%cmp = icmp sgt i32 %1, 10
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br i1 %cmp, label %if.then1, label %if.else
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if.then1: ; preds = %if.then
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call void @sideeffect(i32 0)
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br label %if.end
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if.else: ; preds = %if.then
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call void @sink(i32 %s0)
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call void @sideeffect(i32 1)
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br label %if.end
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if.end: ; preds = %if.else, %if.then1
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call void @sink(i32 %0)
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ret void
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if.end2: ; preds = %entry
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call void @sideeffect(i32 %s1)
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ret void
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}
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; CHECK-LABEL: define {{.*}}@foo.cold.1
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; CHECK: call {{.*}}@sink
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; CHECK: call {{.*}}@sideeffect
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; CHECK: call {{.*}}@sideeffect
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; CHECK: call {{.*}}@sink
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declare void @sideeffect(i32)
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declare void @sink(i32) cold
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