forked from OSchip/llvm-project
121 lines
2.0 KiB
LLVM
121 lines
2.0 KiB
LLVM
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; RUN: llc -mtriple=i686-linux < %s | FileCheck %s
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; Don't rotate the loop if the number of fall through to exit is not larger
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; than the number of fall through to header.
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define void @no_rotate() {
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; CHECK-LABEL: no_rotate
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; CHECK: %entry
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; CHECK: %header
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; CHECK: %middle
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; CHECK: %latch1
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; CHECK: %latch2
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; CHECK: %end
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entry:
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br label %header
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header:
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%val1 = call i1 @foo()
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br i1 %val1, label %middle, label %end
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middle:
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%val2 = call i1 @foo()
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br i1 %val2, label %latch1, label %end
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latch1:
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%val3 = call i1 @foo()
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br i1 %val3, label %latch2, label %header
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latch2:
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%val4 = call i1 @foo()
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br label %header
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end:
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ret void
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}
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define void @do_rotate() {
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; CHECK-LABEL: do_rotate
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; CHECK: %entry
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; CHECK: %then
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; CHECK: %else
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; CHECK: %latch1
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; CHECK: %latch2
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; CHECK: %header
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; CHECK: %end
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entry:
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%val0 = call i1 @foo()
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br i1 %val0, label %then, label %else
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then:
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call void @a()
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br label %header
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else:
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call void @b()
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br label %header
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header:
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%val1 = call i1 @foo()
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br i1 %val1, label %latch1, label %end
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latch1:
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%val3 = call i1 @foo()
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br i1 %val3, label %latch2, label %header
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latch2:
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%val4 = call i1 @foo()
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br label %header
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end:
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ret void
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}
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; The loop structure is same as in @no_rotate, but the loop header's predecessor
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; doesn't fall through to it, so it should be rotated to get exit fall through.
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define void @do_rotate2() {
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; CHECK-LABEL: do_rotate2
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; CHECK: %entry
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; CHECK: %then
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; CHECK: %middle
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; CHECK: %latch1
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; CHECK: %latch2
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; CHECK: %header
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; CHECK: %exit
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entry:
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%val0 = call i1 @foo()
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br i1 %val0, label %then, label %header, !prof !1
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then:
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call void @a()
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br label %end
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header:
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%val1 = call i1 @foo()
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br i1 %val1, label %middle, label %exit
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middle:
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%val2 = call i1 @foo()
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br i1 %val2, label %latch1, label %exit
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latch1:
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%val3 = call i1 @foo()
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br i1 %val3, label %latch2, label %header
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latch2:
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%val4 = call i1 @foo()
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br label %header
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exit:
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call void @b()
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br label %end
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end:
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ret void
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}
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declare i1 @foo()
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declare void @a()
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declare void @b()
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!1 = !{!"branch_weights", i32 10, i32 1}
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