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PreRA scheduler heuristic fixes: VRegCycle, TokenFactor latency.

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UnitsSharePred was a source of randomness in the scheduler: node
priority depended on the queue data structure. I rewrote the recent
VRegCycle heuristics to completely replace the old heuristic without
any randomness. To make these heuristic adjustments to node latency work,
I also needed to do something a little more reasonable with TokenFactor. I
gave it zero latency to its consumers and always schedule it as low as
possible.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129383 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-04-12 19:54:36 +00:00
parent 23ba1e4faa
commit 3eb4319313
4 changed files with 191 additions and 166 deletions
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2
test/CodeGen/ARM/vfp.ll
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@@ -40,8 +40,8 @@ define void @test_add(float* %P, double* %D) {
define void @test_ext_round(float* %P, double* %D) {
;CHECK: test_ext_round:
%a = load float* %P ; <float> [#uses=1]
;CHECK: vcvt.f32.f64
;CHECK: vcvt.f64.f32
;CHECK: vcvt.f32.f64
%b = fpext float %a to double ; <double> [#uses=1]
%A = load double* %D ; <double> [#uses=1]
%B = fptrunc double %A to float ; <float> [#uses=1]