c8ac29ab1d
Today symbol names generated for machine basic block sections use a unary encoding to reduce bloat. This is essential when every basic block in the binary is assigned a symbol however with basic block clusters (rG05192e585ce175b55f2a26b83b4ed7882785c8e6) when we only need to generate a few non-temporary symbols we can assign more descriptive names making them more user friendly. With this change - Cold cluster section for function foo is named "foo.cold" Exception cluster section for function foo is named "foo.eh" Other cluster sections identified by their ids are named "foo.ID" Using this format works well with existing tools. It will demangle as expected and works with existing symbolizers, profilers and debuggers out of the box. $ c++filt _Z3foov.cold foo() [clone .cold] $ c++filt _Z3foov.eh foo() [clone .eh] $c++filt _Z3foov.1234 foo() [clone 1234] Tests for basicblock-sections are updated with some cleanup where appropriate. Differential Revision: https://reviews.llvm.org/D79221
41 lines
1.5 KiB
LLVM
41 lines
1.5 KiB
LLVM
; Check if basic blocks that don't get unique sections are placed in cold sections.
|
|
; Basic block with id 1 and 2 must be in the cold section.
|
|
; RUN: echo '!_Z3bazb' > %t
|
|
; RUN: echo '!!0' >> %t
|
|
; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -basicblock-sections=%t -unique-bb-section-names | FileCheck %s -check-prefix=LINUX-SECTIONS
|
|
|
|
define void @_Z3bazb(i1 zeroext) nounwind {
|
|
%2 = alloca i8, align 1
|
|
%3 = zext i1 %0 to i8
|
|
store i8 %3, i8* %2, align 1
|
|
%4 = load i8, i8* %2, align 1
|
|
%5 = trunc i8 %4 to i1
|
|
br i1 %5, label %6, label %8
|
|
|
|
6: ; preds = %1
|
|
%7 = call i32 @_Z3barv()
|
|
br label %10
|
|
|
|
8: ; preds = %1
|
|
%9 = call i32 @_Z3foov()
|
|
br label %10
|
|
|
|
10: ; preds = %8, %6
|
|
ret void
|
|
}
|
|
|
|
declare i32 @_Z3barv() #1
|
|
|
|
declare i32 @_Z3foov() #1
|
|
|
|
; LINUX-SECTIONS: .section .text._Z3bazb,"ax",@progbits
|
|
; LINUX-SECTIONS: _Z3bazb:
|
|
; Check that the basic block with id 1 doesn't get a section.
|
|
; LINUX-SECTIONS-NOT: .section .text._Z3bazb._Z3bazb.1,"ax",@progbits,unique
|
|
; Check that a single cold section is started here and id 1 and 2 blocks are placed here.
|
|
; LINUX-SECTIONS: .section .text.unlikely._Z3bazb,"ax",@progbits
|
|
; LINUX-SECTIONS: _Z3bazb.cold:
|
|
; LINUX-SECTIONS-NOT: .section .text._Z3bazb._Z3bazb.2,"ax",@progbits,unique
|
|
; LINUX-SECTIONS: .LBB0_2:
|
|
; LINUX-SECTIONS: .size _Z3bazb, .Lfunc_end{{[0-9]}}-_Z3bazb
|