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https://github.com/c64scene-ar/llvm-6502.git
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53b28f8623
Patch by Michele Scandale! Adds a special handling of the case where, during the loop exit condition rewriting, the exit value is a constant of bitwidth lower than the type of the induction variable: instead of introducing a trunc operation in order to match correctly the operand types, it allows to convert the constant value to an equivalent constant, depending on the initial value of the induction variable and the trip count, in order have an equivalent comparison between the induction variable and the new constant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186107 91177308-0d34-0410-b5e6-96231b3b80d8
26 lines
719 B
LLVM
26 lines
719 B
LLVM
;RUN: opt -S %s -indvars | FileCheck %s
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; Function Attrs: nounwind uwtable
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define void @foo() #0 {
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entry:
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%i.01 = phi i16 [ 0, %entry ], [ %inc, %for.body ]
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%conv2 = sext i16 %i.01 to i32
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call void @bar(i32 %conv2) #1
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%inc = add i16 %i.01, 1
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;CHECK-NOT: %lftr.wideiv = trunc i32 %indvars.iv.next to i16
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;CHECK: %exitcond = icmp ne i32 %indvars.iv.next, 512
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%cmp = icmp slt i16 %inc, 512
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body
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ret void
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}
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declare void @bar(i32)
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attributes #0 = { nounwind uwtable }
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attributes #1 = { nounwind }
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