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[PowerPC] Readjust the loop unrolling threshold

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Now that the way that the partial unrolling threshold for small loops is used
to compute the unrolling factor as been corrected, a slightly smaller threshold
is preferable. This is expected; other targets may need to re-tune as well.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225566 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2015-01-10 00:31:10 +00:00
parent a14d6f1ea5
commit 6829815d96
3 changed files with 54 additions and 6 deletions
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4
lib/Target/PowerPC/PPCScheduleP7.td
View File

@ -380,8 +380,8 @@ def P7Model : SchedMachineModel {
// Itineraries are queried instead.
let MispredictPenalty = 16;
// Try to make sure we have at least 10-11 dispatch groups in a loop.
let LoopMicroOpBufferSize = 44;
// Try to make sure we have at least 10 dispatch groups in a loop.
let LoopMicroOpBufferSize = 40;
let Itineraries = P7Itineraries;
}

4
lib/Target/PowerPC/PPCScheduleP8.td
View File

@ -389,8 +389,8 @@ def P8Model : SchedMachineModel {
// Itineraries are queried instead.
let MispredictPenalty = 16;
// Try to make sure we have at least 10-11 dispatch groups in a loop.
let LoopMicroOpBufferSize = 66;
// Try to make sure we have at least 10 dispatch groups in a loop.
let LoopMicroOpBufferSize = 60;
let Itineraries = P8Itineraries;
}

52
test/Transforms/LoopUnroll/PowerPC/p7-unrolling.ll
View File

@ -22,7 +22,31 @@ exit:
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK: icmp
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: icmp
define void @unroll_default() nounwind {
entry:
@ -47,5 +71,29 @@ exit:
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK: icmp
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: icmp