46 lines
1.2 KiB
LLVM
46 lines
1.2 KiB
LLVM
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; RUN: opt < %s -basic-aa -loops -gvn -enable-load-in-loop-pre=false -S | FileCheck %s
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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"
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;void test1(int N, double *G) {
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; int j;
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; for (j = 0; j < N - 1; j++)
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; G[j] = G[j] + G[j+1];
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;}
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define void @test1(i32 %N, double* nocapture %G) nounwind ssp {
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; CHECK-LABEL: @test1(
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entry:
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%0 = add i32 %N, -1
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%1 = icmp sgt i32 %0, 0
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br i1 %1, label %bb.nph, label %return
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bb.nph:
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%tmp = zext i32 %0 to i64
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br label %bb
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; CHECK: bb.nph:
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; CHECK-NOT: load double, double*
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; CHECK: br label %bb
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bb:
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%indvar = phi i64 [ 0, %bb.nph ], [ %tmp6, %bb ]
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%tmp6 = add i64 %indvar, 1
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%scevgep = getelementptr double, double* %G, i64 %tmp6
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%scevgep7 = getelementptr double, double* %G, i64 %indvar
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%2 = load double, double* %scevgep7, align 8
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%3 = load double, double* %scevgep, align 8
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%4 = fadd double %2, %3
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store double %4, double* %scevgep7, align 8
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%exitcond = icmp eq i64 %tmp6, %tmp
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br i1 %exitcond, label %return, label %bb
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; Both loads should remain in the loop.
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; CHECK: bb:
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; CHECK: load double, double*
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; CHECK: load double, double*
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; CHECK: br i1 %exitcond
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return:
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ret void
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}
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