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46bdfb0e6b
to more accurately describe what it does. Expand its doxygen comment to describe what the backedge-taken count is and how it differs from the actual iteration count of the loop. Adjust names and comments in associated code accordingly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65382 91177308-0d34-0410-b5e6-96231b3b80d8
26 lines
957 B
LLVM
26 lines
957 B
LLVM
; RUN: llvm-as < %s | opt -analyze -scalar-evolution | grep {backedge-taken count is 255}
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; XFAIL: *
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define i32 @foo(i32 %x, i32 %y, i32* %lam, i32* %alp) nounwind {
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bb1.thread:
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br label %bb1
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bb1: ; preds = %bb1, %bb1.thread
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%indvar = phi i32 [ 0, %bb1.thread ], [ %indvar.next, %bb1 ] ; <i32> [#uses=4]
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%i.0.reg2mem.0 = sub i32 255, %indvar ; <i32> [#uses=2]
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%0 = getelementptr i32* %alp, i32 %i.0.reg2mem.0 ; <i32*> [#uses=1]
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%1 = load i32* %0, align 4 ; <i32> [#uses=1]
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%2 = getelementptr i32* %lam, i32 %i.0.reg2mem.0 ; <i32*> [#uses=1]
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store i32 %1, i32* %2, align 4
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%3 = sub i32 254, %indvar ; <i32> [#uses=1]
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%4 = icmp slt i32 %3, 0 ; <i1> [#uses=1]
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%indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1]
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br i1 %4, label %bb2, label %bb1
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bb2: ; preds = %bb1
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%tmp10 = mul i32 %indvar, %x ; <i32> [#uses=1]
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%z.0.reg2mem.0 = add i32 %tmp10, %y ; <i32> [#uses=1]
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%5 = add i32 %z.0.reg2mem.0, %x ; <i32> [#uses=1]
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ret i32 %5
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}
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