93 lines
3.9 KiB
LLVM
93 lines
3.9 KiB
LLVM
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; RUN: opt -loop-load-elim -S < %s | \
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; RUN: FileCheck %s -check-prefix=ALL -check-prefix=ONE_STRIDE_SPEC \
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; RUN: -check-prefix=TWO_STRIDE_SPEC
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; RUN: opt -loop-load-elim -S -enable-mem-access-versioning=0 < %s | \
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; RUN: FileCheck %s -check-prefix=ALL -check-prefix=NO_ONE_STRIDE_SPEC \
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; RUN: -check-prefix=NO_TWO_STRIDE_SPEC
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; RUN: opt -loop-load-elim -S -loop-load-elimination-scev-check-threshold=1 < %s | \
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; RUN: FileCheck %s -check-prefix=ALL -check-prefix=ONE_STRIDE_SPEC \
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; RUN: -check-prefix=NO_TWO_STRIDE_SPEC
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; Forwarding in the presence of symbolic strides:
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;
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; for (unsigned i = 0; i < 100; i++)
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; A[i + 1] = A[Stride * i] + B[i];
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; ALL-LABEL: @f(
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define void @f(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N,
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i64 %stride) {
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; ONE_STRIDE_SPEC: %ident.check = icmp ne i64 %stride, 1
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entry:
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; NO_ONE_STRIDE_SPEC-NOT: %load_initial = load i32, i32* %A
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; ONE_STRIDE_SPEC: %load_initial = load i32, i32* %A
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br label %for.body
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for.body: ; preds = %for.body, %entry
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; NO_ONE_STRIDE_SPEC-NOT: %store_forwarded = phi i32 [ %load_initial, {{.*}} ], [ %add, %for.body ]
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; ONE_STRIDE_SPEC: %store_forwarded = phi i32 [ %load_initial, {{.*}} ], [ %add, %for.body ]
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%mul = mul i64 %indvars.iv, %stride
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%arrayidx = getelementptr inbounds i32, i32* %A, i64 %mul
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%load = load i32, i32* %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
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%load_1 = load i32, i32* %arrayidx2, align 4
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; NO_ONE_STRIDE_SPEC-NOT: %add = add i32 %load_1, %store_forwarded
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; ONE_STRIDE_SPEC: %add = add i32 %load_1, %store_forwarded
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%add = add i32 %load_1, %load
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
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store i32 %add, i32* %arrayidx_next, align 4
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%exitcond = icmp eq i64 %indvars.iv.next, %N
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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; With two symbolic strides:
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;
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; for (unsigned i = 0; i < 100; i++)
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; A[Stride2 * (i + 1)] = A[Stride1 * i] + B[i];
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; ALL-LABEL: @two_strides(
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define void @two_strides(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N,
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i64 %stride.1, i64 %stride.2) {
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; TWO_STRIDE_SPEC: %ident.check = icmp ne i64 %stride.2, 1
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; TWO_STRIDE_SPEC: %ident.check1 = icmp ne i64 %stride.1, 1
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; NO_TWO_STRIDE_SPEC-NOT: %ident.check{{.*}} = icmp ne i64 %stride{{.*}}, 1
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entry:
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; NO_TWO_STRIDE_SPEC-NOT: %load_initial = load i32, i32* %A
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; TWO_STRIDE_SPEC: %load_initial = load i32, i32* %A
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br label %for.body
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for.body: ; preds = %for.body, %entry
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; NO_TWO_STRIDE_SPEC-NOT: %store_forwarded = phi i32 [ %load_initial, {{.*}} ], [ %add, %for.body ]
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; TWO_STRIDE_SPEC: %store_forwarded = phi i32 [ %load_initial, {{.*}} ], [ %add, %for.body ]
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%mul = mul i64 %indvars.iv, %stride.1
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%arrayidx = getelementptr inbounds i32, i32* %A, i64 %mul
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%load = load i32, i32* %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
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%load_1 = load i32, i32* %arrayidx2, align 4
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; NO_TWO_STRIDE_SPEC-NOT: %add = add i32 %load_1, %store_forwarded
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; TWO_STRIDE_SPEC: %add = add i32 %load_1, %store_forwarded
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%add = add i32 %load_1, %load
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%mul.2 = mul i64 %indvars.iv.next, %stride.2
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%arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %mul.2
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store i32 %add, i32* %arrayidx_next, align 4
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%exitcond = icmp eq i64 %indvars.iv.next, %N
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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