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41 lines
1.6 KiB
LLVM
41 lines
1.6 KiB
LLVM
; RUN: opt < %s -indvars -S | FileCheck %s
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;
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; Prior to the fix for PR11375, indvars would replace %firstIV with a
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; loop-invariant gep computed in the preheader. This was incorrect
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; because it was based on the minimum "ExitNotTaken" count. If the
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; final loop test is skipped (odd number of elements) then the early
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; exit would be taken and the loop invariant value would be incorrect.
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-darwin"
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; CHECK: if.end:
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; CHECK: phi i32* [ %first.lcssa, %early.exit ]
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define i32 @test(i32* %first, i32* %last) uwtable ssp {
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entry:
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br i1 undef, label %if.end, label %if.then
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if.then: ; preds = %entry
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br i1 undef, label %if.end, label %do.body
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do.body: ; preds = %if.else, %if.then
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%firstIV = phi i32* [ %incdec.ptr2, %if.else ], [ %first, %if.then ]
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%incdec.ptr1 = getelementptr inbounds i32* %firstIV, i64 1
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%cmp1 = icmp eq i32* %incdec.ptr1, %last
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br i1 %cmp1, label %early.exit, label %if.else
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if.else: ; preds = %do.body
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%incdec.ptr2 = getelementptr inbounds i32* %firstIV, i64 2
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%cmp2 = icmp eq i32* %incdec.ptr2, %last
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br i1 %cmp2, label %if.end, label %do.body
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early.exit:
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%first.lcssa = phi i32* [ %firstIV, %do.body ]
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br label %if.end
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if.end:
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%tmp = phi i32* [ %first.lcssa, %early.exit ], [ %first, %if.then ], [ %first, %entry ], [ undef, %if.else ]
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%val = load i32* %tmp
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ret i32 %val
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}
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