ba6c5f8e4e
This is the first PR to enable the prefetch optimization via Propeller based on our [RFC](https://discourse.llvm.org/t/rfc-code-prefetch-insertion/88668/22). It enables emitting special symbols prefixed with `__llvm_prefetch_target` to point to the prefetch targets as specified via directives in the profile. A prefetch target is uniquely identified by its function name, basic block ID, and the subblock index (used when the target is after a call instruction). A new pass is added which sets a field in basic blocks which have prefetch targets. The next PR will add the prefetch insertion logic into the same pass.
30 lines
792 B
LLVM
30 lines
792 B
LLVM
;; Check prefetch directives properly handle a block terminating with a call.
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;;
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;; Specify the bb sections profile:
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; RUN: echo 'v1' > %t
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; RUN: echo 'f fred' >> %t
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; RUN: echo 't 0,1' >> %t
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;;
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; RUN: llc < %s -mtriple=x86_64-pc-linux -asm-verbose=false -function-sections -basic-block-sections=%t -O1 | FileCheck %s
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define i32 @fred() personality ptr @__gxx_personality_v0 {
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entry:
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invoke void @explode()
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to label %continue unwind label %cleanup
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; CHECK: fred:
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; CHECK: callq explode@PLT
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; CHECK-NEXT: .globl __llvm_prefetch_target_fred_0_1
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; CHECK-NEXT: __llvm_prefetch_target_fred_0_1:
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continue:
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ret i32 0
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cleanup:
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%res = landingpad { i8*, i32 }
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cleanup
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resume { i8*, i32 } %res
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}
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declare void @__gxx_personality_v0()
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declare void @explode()
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