0cc063a8ff
Summary: Instead of adding a ".unlikely" or ".eh" suffix for machine basic blocks, this change updates the behaviour to use an appropriate prefix instead. This allows lld to group basic block sections together when -z,keep-text-section-prefix is specified and matches the behaviour observed in gcc. Reviewers: tmsriram, mtrofin, efriedma Reviewed By: tmsriram, efriedma Subscribers: eli.friedman, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D78742
42 lines
1.5 KiB
LLVM
42 lines
1.5 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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; RUN: echo '!_Z3bazb' > %t
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; RUN: echo '!!0' >> %t
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; RUN: cat %t
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; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -basicblock-sections=%t -unique-bb-section-names | FileCheck %s -check-prefix=LINUX-SECTIONS
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define void @_Z3bazb(i1 zeroext) {
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%2 = alloca i8, align 1
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%3 = zext i1 %0 to i8
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store i8 %3, i8* %2, align 1
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%4 = load i8, i8* %2, align 1
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%5 = trunc i8 %4 to i1
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br i1 %5, label %6, label %8
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6: ; preds = %1
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%7 = call i32 @_Z3barv()
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br label %10
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8: ; preds = %1
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%9 = call i32 @_Z3foov()
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br label %10
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10: ; preds = %8, %6
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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._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.r.BB._Z3bazb,"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.unlikely._Z3bazb,"ax",@progbits
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; LINUX-SECTIONS: r.BB._Z3bazb:
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; LINUX-SECTIONS-NOT: .section .text._Z3bazb.rr.BB._Z3bazb,"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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