66 lines
2.3 KiB
LLVM
66 lines
2.3 KiB
LLVM
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; BB cluster sections test for optimizing basic block branches.
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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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; There should be a jne from #0 to #1 and a fallthrough to #2.
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; BB #1 will be in a unique section. Therefore, it should retain its jmp to #3.
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; #2 must also have an explicit jump to #3.
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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 -basic-block-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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; The rest (#0 and #2) go into the function's section.
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; This means #1 must fall through to #3, and #0 must fall through to #2.
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; #2 must have an explicit jump to #3.
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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 -basic-block-sections=%t2 | FileCheck %s -check-prefix=LINUX-SECTIONS2
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define void @foo(i1 zeroext) nounwind {
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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-LABEL: foo:
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; LINUX-SECTIONS1: jne foo.__part.1
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; LINUX-SECTIONS1-NOT: {{jne|je|jmp}}
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; LINUX-SECTIONS1-LABEL: # %bb.2:
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; LINUX-SECTIONS1: jmp foo.cold
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; LINUX-SECTIONS1: .section .text.foo,"ax",@progbits,unique,1
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; LINUX-SECTIONS1-LABEL: foo.__part.1:
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; LINUX-SECTIONS1: jmp foo.cold
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; LINUX-SECTIONS1: .section .text.split.foo,"ax",@progbits
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; LINUX-SECTIONS1-LABEL: foo.cold:
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; LINUX-SECTIONS2: .section .text.foo,"ax",@progbits
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; LINUX-SECTIONS2-LABEL: foo:
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; LINUX-SECTIONS2: jne foo.__part.0
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; LINUX-SECTIONS2-NOT: {{jne|je|jmp}}
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; LINUX-SECTIONS2-LABEL: # %bb.2:
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; LINUX-SECTIONS2: jmp .LBB0_3
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; LINUX-SECTIONS2: .section .text.foo,"ax",@progbits,unique,1
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; LINUX-SECTIONS2: foo.__part.0:
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; LINUX-SECTIONS2-NOT: {{jne|je|jmp}}
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; LINUX-SECTIONS2: .LBB0_3:
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