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850f791abc
analysis. This allows indvars to emit a simpler loop trip count expression. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76085 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
1.3 KiB
LLVM
39 lines
1.3 KiB
LLVM
; RUN: llvm-as < %s | opt -indvars | llvm-dis | grep add | count 1
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; Indvars should be able to compute the exit value of this loop
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; without any additional arithmetic. The only add needed should
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; be the canonical IV increment.
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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"
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define void @foo(double* %p, i32 %n) nounwind {
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entry:
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%0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
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br i1 %0, label %bb.nph, label %return
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bb.nph: ; preds = %entry
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br label %bb2
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bb2: ; preds = %bb3, %bb.nph
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%i.01 = phi i32 [ %7, %bb3 ], [ 0, %bb.nph ] ; <i32> [#uses=3]
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%1 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
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%2 = getelementptr double* %p, i64 %1 ; <double*> [#uses=1]
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%3 = load double* %2, align 8 ; <double> [#uses=1]
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%4 = fmul double %3, 1.100000e+00 ; <double> [#uses=1]
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%5 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
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%6 = getelementptr double* %p, i64 %5 ; <double*> [#uses=1]
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store double %4, double* %6, align 8
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%7 = add i32 %i.01, 1 ; <i32> [#uses=2]
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br label %bb3
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bb3: ; preds = %bb2
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%8 = icmp slt i32 %7, %n ; <i1> [#uses=1]
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br i1 %8, label %bb2, label %bb3.return_crit_edge
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bb3.return_crit_edge: ; preds = %bb3
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br label %return
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return: ; preds = %bb3.return_crit_edge, %entry
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ret void
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}
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