6ac71a0149
This patch introduces a new version for the basic block sections profile as was requested in D158442, while keeping backward compatibility for the old version. The new encoding is as follows: ``` m <module_name> f <function_name_1> <function_name_2>... c <bb_id_1> <bb_id_2> <bb_id_3> c <bb_id_4> <bb_id_5> ... ``` Module name specifier (starting with 'm') is optional and allows distinguishing profiles for internal-linkage functions with the same name. If not specified, profile will be applied to any function with the same name. Function name specifier (starting with 'f') can specify multiple function name aliases. Finally, basic block clusters are specified by 'c' and specify the cluster of basic blocks, and the internal order in which they must be placed in the same section.
52 lines
2.0 KiB
LLVM
52 lines
2.0 KiB
LLVM
;; Check if basic blocks that don't get unique sections are placed in cold sections.
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;; Basic block with id 1 and 2 must be in the cold section.
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;;
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;; Profile for version 0
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; RUN: echo '!_Z3bazb' > %t1
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; RUN: echo '!!0' >> %t1
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;;
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;; Profile for version 1
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; RUN: echo 'v1' > %t2
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; RUN: echo 'f _Z3bazb' >> %t2
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; RUN: echo 'c 0' >> %t2
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;;
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; RUN: llc < %s -mtriple=x86_64 -function-sections -basic-block-sections=%t1 -unique-basic-block-section-names | FileCheck %s -check-prefix=LINUX-SECTIONS
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; RUN: llc < %s -mtriple=x86_64 -function-sections -basic-block-sections=%t2 -unique-basic-block-section-names | FileCheck %s -check-prefix=LINUX-SECTIONS
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; RUN: llc < %s -mtriple=x86_64 -function-sections -basic-block-sections=%t1 -unique-basic-block-section-names -bbsections-cold-text-prefix=".text.unlikely." | FileCheck %s -check-prefix=LINUX-SPLIT
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define void @_Z3bazb(i1 zeroext %0) nounwind {
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br i1 %0, label %2, label %4
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2: ; preds = %1
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%3 = call i32 @_Z3barv()
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br label %6
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4: ; preds = %1
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%5 = call i32 @_Z3foov()
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br label %6
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6: ; preds = %2, %4
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ret void
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}
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declare i32 @_Z3barv() #1
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declare i32 @_Z3foov() #1
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; LINUX-SECTIONS: .section .text.hot._Z3bazb,"ax",@progbits
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; LINUX-SECTIONS: _Z3bazb:
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; Check that the basic block with id 1 doesn't get a section.
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; LINUX-SECTIONS-NOT: .section .text{{.*}}._Z3bazb.1,"ax",@progbits,unique
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; Check that a single cold section is started here and id 1 and 2 blocks are placed here.
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; LINUX-SECTIONS: .section .text.split._Z3bazb,"ax",@progbits
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; LINUX-SECTIONS: _Z3bazb.cold:
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; LINUX-SECTIONS-NOT: .section .text.hot._Z3bazb._Z3bazb.2,"ax",@progbits,unique
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; LINUX-SECTIONS: .LBB0_2:
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; LINUX-SECTIONS: .size _Z3bazb, .Lfunc_end{{[0-9]}}-_Z3bazb
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; LINUX-SPLIT: .section .text.unlikely._Z3bazb,"ax",@progbits
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; LINUX-SPLIT-NEXT: _Z3bazb.cold:
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; LINUX-SPLIT-NEXT: callq _Z3barv
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; LINUX-SPLIT: .LBB0_2:
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; LINUX-SPLIT: .LBB_END0_2:
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