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2be00d9e54
Current tail duplication integrated in bb layout is designed to increase the fallthrough from a BB's predecessor to its successor, but we have observed cases that duplication doesn't increase fallthrough, or it brings too much size overhead. To overcome these two issues in function canTailDuplicateUnplacedPreds I add two checks: make sure there is at least one duplication in current work set. the number of duplication should not exceed the number of successors. The modification in hasBetterLayoutPredecessor fixes a bug that potential predecessor must be at the bottom of a chain. Differential Revision: https://reviews.llvm.org/D64376
55 lines
883 B
LLVM
55 lines
883 B
LLVM
; RUN: llc -mtriple thumbv7-unknown-linux -o - %s | FileCheck %s
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declare void @x()
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declare void @y()
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define void @f(i32 %x, i32 %y) {
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; CHECK-LABEL: f:
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; CHECK: cbz
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%p = icmp eq i32 %x, 0
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br i1 %p, label %t, label %f
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t:
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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; CHECK: bne
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%q = icmp eq i32 %y, 0
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br i1 %q, label %t2, label %f
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t2:
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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call void @x()
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br label %f
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f:
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call void @y()
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ret void
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}
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