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.
71 lines
2.1 KiB
LLVM
71 lines
2.1 KiB
LLVM
;; Check prefetch directives in basic block section profiles.
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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 foo' >> %t
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; RUN: echo 't 0,0' >> %t
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; RUN: echo 't 1,0' >> %t
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; RUN: echo 't 1,1' >> %t
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; RUN: echo 't 2,1' >> %t
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; RUN: echo 't 3,0' >> %t
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; RUN: echo 'f bar' >> %t
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; RUN: echo 't 0,0' >> %t
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; RUN: echo 't 21,1' >> %t
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; RUN: echo 'f qux' >> %t
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; RUN: echo 't 0,0' >> %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 -O0 | FileCheck %s
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define void @foo(i1 %arg) nounwind {
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br i1 %arg, label %cond.true, label %cond.false
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; CHECK: foo:
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; CHECK-NEXT: .globl __llvm_prefetch_target_foo_0_0
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; CHECK-NEXT: __llvm_prefetch_target_foo_0_0:
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cond.true: ; preds = %1
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call i32 @bar()
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br label %end
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; CHECK: .globl __llvm_prefetch_target_foo_1_0
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; CHECK-NEXT: __llvm_prefetch_target_foo_1_0:
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; CHECK-NEXT: callq bar@PLT
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; CHECK-NEXT: .globl __llvm_prefetch_target_foo_1_1
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; CHECK-NEXT: __llvm_prefetch_target_foo_1_1:
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cond.false: ; preds = %1
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call i32 @baz()
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br label %end
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; CHECK: callq baz@PLT
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; CHECK-NEXT: .globl __llvm_prefetch_target_foo_2_1
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; CHECK-NEXT: __llvm_prefetch_target_foo_2_1:
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end: ; preds = %11, %9
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ret void
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; CHECK: .LBB0_3:
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; CHECK-NEXT: .globl __llvm_prefetch_target_foo_3_0
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; CHECK-NEXT: __llvm_prefetch_target_foo_3_0:
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}
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define weak i32 @bar() nounwind {
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%call = call i32 @baz()
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ret i32 %call
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; CHECK: bar:
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; CHECK-NEXT: .weak __llvm_prefetch_target_bar_0_0
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; CHECK-NEXT: __llvm_prefetch_target_bar_0_0:
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; CHECK: callq baz@PLT
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}
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define internal i32 @qux() nounwind {
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%call = call i32 @baz()
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ret i32 %call
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; CHECK: qux:
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; CHECK-NEXT: .globl __llvm_prefetch_target_qux_0_0
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; CHECK-NEXT: __llvm_prefetch_target_qux_0_0:
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; CHECK: callq baz@PLT
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; CHECK-NEXT: .globl __llvm_prefetch_target_qux_0_1
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; CHECK-NEXT: __llvm_prefetch_target_qux_0_1:
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}
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declare i32 @baz()
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declare i32 @dummy()
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