fe182ddf1f
Use ConstantFoldLoadFromConst() instead of a partial re-implementation. This makes the code slightly more generic by not depending on the exact structure of the constant.
40 lines
2.1 KiB
LLVM
40 lines
2.1 KiB
LLVM
; RUN: opt < %s -S -passes=loop-unroll -unroll-max-iteration-count-to-analyze=1000 -unroll-threshold=10 -unroll-max-percent-threshold-boost=100 | FileCheck %s -check-prefix=TEST1
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; RUN: opt < %s -S -passes=loop-unroll -unroll-max-iteration-count-to-analyze=1000 -unroll-threshold=20 -unroll-max-percent-threshold-boost=200 | FileCheck %s -check-prefix=TEST2
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; RUN: opt < %s -S -passes=loop-unroll -unroll-max-iteration-count-to-analyze=1000 -unroll-threshold=20 -unroll-max-percent-threshold-boost=100 | FileCheck %s -check-prefix=TEST3
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; This test is a copy of full-unroll-heuristics.ll but with the constant
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; wrapped in an extra struct. This should not hinder the analysis.
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; If the absolute threshold is too low, we should not unroll:
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; TEST1: %array_const_idx = getelementptr inbounds { [9 x i32] }, ptr @known_constant, i64 0, i32 0, i64 %iv
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; Otherwise, we should:
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; TEST2-NOT: %array_const_idx = getelementptr inbounds { [9 x i32] }, ptr @known_constant, i64 0, i32 0, i64 %iv
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; If we do not boost threshold, the unroll will not happen:
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; TEST3: %array_const_idx = getelementptr inbounds { [9 x i32] }, ptr @known_constant, i64 0, i32 0, i64 %iv
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@known_constant = internal unnamed_addr constant { [9 x i32] } { [9 x i32] [i32 0, i32 -1, i32 0, i32 -1, i32 5, i32 -1, i32 0, i32 -1, i32 0] }, align 16
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define i32 @foo(ptr noalias nocapture readonly %src) {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%iv = phi i64 [ 0, %entry ], [ %inc, %loop ]
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%r = phi i32 [ 0, %entry ], [ %add, %loop ]
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%arrayidx = getelementptr inbounds i32, ptr %src, i64 %iv
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%src_element = load i32, ptr %arrayidx, align 4
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%array_const_idx = getelementptr inbounds { [9 x i32] }, ptr @known_constant, i64 0, i32 0, i64 %iv
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%const_array_element = load i32, ptr %array_const_idx, align 4
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%mul = mul nsw i32 %src_element, %const_array_element
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%add = add nsw i32 %mul, %r
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%inc = add nuw nsw i64 %iv, 1
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%exitcond86.i = icmp eq i64 %inc, 9
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br i1 %exitcond86.i, label %loop.end, label %loop
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loop.end: ; preds = %loop
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%r.lcssa = phi i32 [ %r, %loop ]
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ret i32 %r.lcssa
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}
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