48 lines
1.7 KiB
LLVM
48 lines
1.7 KiB
LLVM
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; RUN: opt < %s -S -passes="default<O2>" -unroll-runtime=true -unroll-threshold-default=0 -unroll-threshold-aggressive=300 | FileCheck %s -check-prefix=O2
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; RUN: opt < %s -S -passes="default<O3>" -unroll-runtime=true -unroll-threshold-default=0 -unroll-threshold-aggressive=300 | FileCheck %s -check-prefix=O3
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; RUN: opt < %s -S -passes="default<Os>" -unroll-runtime=true -unroll-threshold-default=0 -unroll-threshold-aggressive=300 | FileCheck %s -check-prefix=Os
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; RUN: opt < %s -S -passes="default<Oz>" -unroll-runtime=true -unroll-threshold-default=0 -unroll-threshold-aggressive=300 | FileCheck %s -check-prefix=Oz
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; Check that Os and Oz are optimized like O2, not like O3. To easily highlight
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; the behavior, we artificially disable unrolling for anything but O3 by setting
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; the default threshold to 0.
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; O3: loop1.preheader
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; O2-NOT: loop1.preheader
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; Os-NOT: loop1.preheader
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; Oz-NOT: loop1.preheader
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define void @unroll(i32 %iter, i32* %addr1, i32* %addr2) nounwind {
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entry:
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br label %loop1
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loop1:
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%iv1 = phi i32 [ 0, %entry ], [ %inc1, %loop1.latch ]
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%offset1 = getelementptr i32, i32* %addr1, i32 %iv1
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store i32 %iv1, i32* %offset1, align 4
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br label %loop2.header
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loop2.header:
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%e = icmp uge i32 %iter, 1
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br i1 %e, label %loop2, label %exit2
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loop2:
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%iv2 = phi i32 [ 0, %loop2.header ], [ %inc2, %loop2 ]
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%offset2 = getelementptr i32, i32* %addr2, i32 %iv2
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store i32 %iv2, i32* %offset2, align 4
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%inc2 = add i32 %iv2, 1
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%exitcnd2 = icmp uge i32 %inc2, %iter
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br i1 %exitcnd2, label %exit2, label %loop2
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exit2:
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br label %loop1.latch
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loop1.latch:
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%inc1 = add i32 %iv1, 1
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%exitcnd1 = icmp uge i32 %inc1, 1024
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br i1 %exitcnd1, label %exit, label %loop1
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exit:
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ret void
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}
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