derek.holloway
7502bf64a4
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24 lines
586 B
LLVM
24 lines
586 B
LLVM
; RUN: llc -mtriple=hexagon-unknown-linux-gnu -enable-pipeliner -debug-only=pipeliner < %s 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; CHECK: Cannot pipeline loop due to PHI cycle
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define void @phi_cycle_loop(i32 %a, i32 %b) {
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entry:
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br label %loop
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loop:
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%1 = phi i32 [ %a, %entry ], [ %3, %loop ]
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%2 = phi i32 [ %a, %entry ], [ %1, %loop ]
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%3 = phi i32 [ %b, %entry ], [ %2, %loop ]
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; Prevent PHI elimination by using all values
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%add1 = add i32 %1, %2
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%add2 = add i32 %add1, %3
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%cmp = icmp slt i32 %add2, 100
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br i1 %cmp, label %loop, label %exit
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exit:
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ret void
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}
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