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
72 lines
2.5 KiB
LLVM
72 lines
2.5 KiB
LLVM
; BB cluster section tests.
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;
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; Test1: Basic blocks #0 (entry) and #2 will be placed in the same section.
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; Basic block 1 will be placed in a unique section.
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; The rest will be placed in the cold section.
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; RUN: echo '!foo' > %t1
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; RUN: echo '!!0 2' >> %t1
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; RUN: echo '!!1' >> %t1
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; RUN: llc < %s -O0 -mtriple=x86_64-pc-linux -function-sections -basicblock-sections=%t1 | FileCheck %s -check-prefix=LINUX-SECTIONS1
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;
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; Test2: Basic blocks #1 and #3 will be placed in the same section.
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; All other BBs (including the entry block) go into the function's section.
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; RUN: echo '!foo' > %t2
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; RUN: echo '!!1 3' >> %t2
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; RUN: llc < %s -O0 -mtriple=x86_64-pc-linux -function-sections -basicblock-sections=%t2 | FileCheck %s -check-prefix=LINUX-SECTIONS2
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define void @foo(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 @bar()
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br label %10
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8: ; preds = %1
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%9 = call i32 @baz()
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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 @bar() #1
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declare i32 @baz() #1
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; LINUX-SECTIONS1: .section .text.foo,"ax",@progbits
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; LINUX-SECTIONS1-NOT: .section
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; LINUX-SECTIONS1-LABEL: foo:
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; LINUX-SECTIONS1-NOT: .section
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; LINUX-SECTIONS1-LABEL: # %bb.2:
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; LINUX-SECTIONS1: .section .text.foo,"ax",@progbits,unique,1
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; LINUX-SECTIONS1-LABEL: a.BB.foo:
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; LINUX-SECTIONS1-LABEL: .Ltmp0:
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; LINUX-SECTIONS1-NEXT: .size a.BB.foo, .Ltmp0-a.BB.foo
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; LINUX-SECTIONS1-NOT: .section
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; LINUX-SECTIONS1: .section .text.unlikely.foo,"ax",@progbits
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; LINUX-SECTIONS1-LABEL: raa.BB.foo:
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; LINUX-SECTIONS1: .section .text.foo,"ax",@progbits
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; LINUX-SECTIONS1-LABEL: .Lfunc_end0:
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; LINUX-SECTIONS1-NEXT: .size foo, .Lfunc_end0-foo
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; LINUX-SECTIONS2: .section .text.foo,"ax",@progbits
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; LINUX-SECTIONS2-NOT: .section
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; LINUX-SECTIONS2-LABEL: foo:
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; LINUX-SECTIONS2-NOT: .section
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; LINUX-SECTIONS2-LABEL: # %bb.2:
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; LINUX-SECTIONS2: .section .text.foo,"ax",@progbits,unique,1
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; LINUX-SECTIONS2-NEXT: a.BB.foo:
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; LINUX-SECTIONS2-NOT: .section
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; LINUX-SECTIONS2-LABEL: .LBB0_3:
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; LINUX-SECTIONS2-LABEL: .Ltmp0:
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; LINUX-SECTIONS2-NEXT: .size a.BB.foo, .Ltmp0-a.BB.foo
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; LINUX-SECTIONS2: .section .text.foo,"ax",@progbits
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; LINUX-SECTIONS2-LABEL: .Lfunc_end0:
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; LINUX-SECTIONS2-NEXT: .size foo, .Lfunc_end0-foo
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