98 lines
4.0 KiB
LLVM
98 lines
4.0 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-max-iteration-count-to-analyze=100 -unroll-dynamic-cost-savings-discount=1000 -unroll-threshold=10 -unroll-percent-dynamic-cost-saved-threshold=50 | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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@known_constant = internal unnamed_addr constant [10 x i32] [i32 0, i32 1, i32 0, i32 1, i32 0, i32 1, i32 0, i32 1, i32 0, i32 1], align 16
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; We should be able to propagate constant data through different types of
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; casts. For example, in this test we have a load, which becomes constant after
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; unrolling, which then is truncated to i8. Obviously, truncated value is also a
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; constant, which can be used in the further simplifications.
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;
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; We expect this loop to be unrolled, because in this case load would become
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; constant, which is 0 in many cases, and which, in its turn, helps to simplify
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; following multiplication and addition. In total, unrolling should help to
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; optimize ~60% of all instructions in this case.
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;
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; CHECK-LABEL: @const_load_trunc
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; CHECK-NOT: br i1
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; CHECK: ret i8 %
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define i8 @const_load_trunc(i32* 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 i8 [ 0, %entry ], [ %add, %loop ]
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%arrayidx = getelementptr inbounds i32, i32* %src, i64 %iv
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%src_element = load i32, i32* %arrayidx, align 4
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%array_const_idx = getelementptr inbounds [10 x i32], [10 x i32]* @known_constant, i64 0, i64 %iv
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%const_array_element = load i32, i32* %array_const_idx, align 4
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%x = trunc i32 %src_element to i8
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%y = trunc i32 %const_array_element to i8
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%mul = mul nsw i8 %x, %y
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%add = add nsw i8 %mul, %r
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%inc = add nuw nsw i64 %iv, 1
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%exitcond86.i = icmp eq i64 %inc, 10
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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 i8 [ %r, %loop ]
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ret i8 %r.lcssa
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}
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; The same test as before, but with ZEXT instead of TRUNC.
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; CHECK-LABEL: @const_load_zext
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; CHECK-NOT: br i1
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; CHECK: ret i64 %
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define i64 @const_load_zext(i32* 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 i64 [ 0, %entry ], [ %add, %loop ]
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%arrayidx = getelementptr inbounds i32, i32* %src, i64 %iv
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%src_element = load i32, i32* %arrayidx, align 4
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%array_const_idx = getelementptr inbounds [10 x i32], [10 x i32]* @known_constant, i64 0, i64 %iv
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%const_array_element = load i32, i32* %array_const_idx, align 4
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%x = zext i32 %src_element to i64
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%y = zext i32 %const_array_element to i64
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%mul = mul nsw i64 %x, %y
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%add = add nsw i64 %mul, %r
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%inc = add nuw nsw i64 %iv, 1
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%exitcond86.i = icmp eq i64 %inc, 10
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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 i64 [ %r, %loop ]
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ret i64 %r.lcssa
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}
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; The same test as the first one, but with SEXT instead of TRUNC.
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; CHECK-LABEL: @const_load_sext
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; CHECK-NOT: br i1
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; CHECK: ret i64 %
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define i64 @const_load_sext(i32* 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 i64 [ 0, %entry ], [ %add, %loop ]
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%arrayidx = getelementptr inbounds i32, i32* %src, i64 %iv
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%src_element = load i32, i32* %arrayidx, align 4
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%array_const_idx = getelementptr inbounds [10 x i32], [10 x i32]* @known_constant, i64 0, i64 %iv
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%const_array_element = load i32, i32* %array_const_idx, align 4
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%x = sext i32 %src_element to i64
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%y = sext i32 %const_array_element to i64
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%mul = mul nsw i64 %x, %y
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%add = add nsw i64 %mul, %r
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%inc = add nuw nsw i64 %iv, 1
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%exitcond86.i = icmp eq i64 %inc, 10
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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 i64 [ %r, %loop ]
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ret i64 %r.lcssa
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}
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