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[ThinLTO] Represent relative BF using a scaled representation .

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Summary:
The current integer representation of relative block frequency prevents
representing relative block frequencies below 1. This change uses a 8 of
the 29 bits to represent the decimal part by using a fixed scale of -8.

Reviewers: tejohnson, davidxl

Subscribers: mehdi_amini, inglorion, llvm-commits

Differential Revision: https://reviews.llvm.org/D43520

llvm-svn: 325823
This commit is contained in:
Easwaran Raman
2018-02-22 19:44:08 +00:00
parent beda214996
commit 385d8ea8b5
3 changed files with 23 additions and 16 deletions
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2
llvm/test/Bitcode/thinlto-function-summary-callgraph-relbf.ll
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@@ -11,7 +11,7 @@
; CHECK: <GLOBALVAL_SUMMARY_BLOCK
; CHECK-NEXT: <VERSION
; See if the call to func is registered.
; CHECK-NEXT: <PERMODULE_RELBF {{.*}} op4=1 {{.*}} op7=1
; CHECK-NEXT: <PERMODULE_RELBF {{.*}} op4=1 {{.*}} op7=256
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
; CHECK: <STRTAB_BLOCK
; CHECK-NEXT: blob data = 'undefinedglobmainfunc{{.*}}'