[BOLT] Introduce .text.warm for -use-cdsplit=1 #73080
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Note: this PR is 4/8 for upstreaming a new 3-way (hot-warm-cold) function splitting algorithm CDSplit. |
This commit modifies BinaryContext::calculateEmittedSize to update the BinaryBasicBlock::OutputAddressRange for each basic block in the input BF. The modification is done in place, where BB.OutputAddressRange.second less BB.OutputAddressRange.first now gives the emitted size of the basic block.
This commit updates SplitFunctions.h and SplitFunctions.cpp to enable the reuse of createEHTrampolines, mergeEHTrampolines, hasFullProfile, and allBlocksCold by a distinct function splitting pass (CDSplit).
This commit establishes the general structure of the CDSplit implementation without incorporating the exact splitting logic. Currently, all functions undergo hot-cold splitting based on the decisions made by the SplitFunctions pass. Subsequent commits will introduce the precise splitting logic.
This commit explicitly adds a warm code section, .text.warm, when the -use-cdsplit=1 flag is set. This replaces the previous approach of using .text.cold.0 as warm and .text.cold.1 as cold in 3-way splitting.
ShatianWang
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This commit explicitly adds a warm code section, .text.warm, when the
-use-cdsplit=1 flag is set. This replaces the previous approach of using
.text.cold.0 as warm and .text.cold.1 as cold in 3-way splitting.