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https://github.com/c64scene-ar/llvm-6502.git
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931e345e76
the loop exit test. This usually doesn't come up for a variety of reasons, but it isn't impossible, so make IndVarSimplify handle it conservatively. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101008 91177308-0d34-0410-b5e6-96231b3b80d8
85 lines
2.3 KiB
LLVM
85 lines
2.3 KiB
LLVM
; RUN: opt -indvars -S < %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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@X = external global [0 x double]
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; Indvars should be able to simplify simple comparisons involving
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; induction variables.
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; CHECK: @foo
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; CHECK: %cond = and i1 %tobool.not, true
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define void @foo(i64 %n, i32* nocapture %p) nounwind {
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entry:
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%cmp9 = icmp sgt i64 %n, 0
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br i1 %cmp9, label %pre, label %return
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pre:
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%t3 = load i32* %p
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%tobool.not = icmp ne i32 %t3, 0
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br label %loop
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loop:
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%i = phi i64 [ 0, %pre ], [ %inc, %for.inc ]
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%cmp6 = icmp slt i64 %i, %n
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%cond = and i1 %tobool.not, %cmp6
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br i1 %cond, label %if.then, label %for.inc
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if.then:
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%arrayidx = getelementptr [0 x double]* @X, i64 0, i64 %i
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store double 3.200000e+00, double* %arrayidx
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br label %for.inc
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for.inc:
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%inc = add nsw i64 %i, 1
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%exitcond = icmp sge i64 %inc, %n
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br i1 %exitcond, label %return, label %loop
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return:
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ret void
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}
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; Don't eliminate an icmp that's contributing to the loop exit test though.
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; CHECK: @_ZNK4llvm5APInt3ultERKS0_
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; CHECK: %tmp99 = icmp sgt i32 %i, -1
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define i32 @_ZNK4llvm5APInt3ultERKS0_(i32 %tmp2.i1, i64** %tmp65, i64** %tmp73, i64** %tmp82, i64** %tmp90) {
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entry:
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br label %bb18
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bb13:
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%tmp66 = load i64** %tmp65, align 4
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%tmp68 = getelementptr inbounds i64* %tmp66, i32 %i
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%tmp69 = load i64* %tmp68, align 4
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%tmp74 = load i64** %tmp73, align 4
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%tmp76 = getelementptr inbounds i64* %tmp74, i32 %i
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%tmp77 = load i64* %tmp76, align 4
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%tmp78 = icmp ugt i64 %tmp69, %tmp77
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br i1 %tmp78, label %bb20.loopexit, label %bb15
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bb15:
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%tmp83 = load i64** %tmp82, align 4
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%tmp85 = getelementptr inbounds i64* %tmp83, i32 %i
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%tmp86 = load i64* %tmp85, align 4
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%tmp91 = load i64** %tmp90, align 4
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%tmp93 = getelementptr inbounds i64* %tmp91, i32 %i
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%tmp94 = load i64* %tmp93, align 4
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%tmp95 = icmp ult i64 %tmp86, %tmp94
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br i1 %tmp95, label %bb20.loopexit, label %bb17
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bb17:
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%tmp97 = add nsw i32 %i, -1
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br label %bb18
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bb18:
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%i = phi i32 [ %tmp2.i1, %entry ], [ %tmp97, %bb17 ]
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%tmp99 = icmp sgt i32 %i, -1
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br i1 %tmp99, label %bb13, label %bb20.loopexit
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bb20.loopexit:
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%tmp.0.ph = phi i32 [ 0, %bb18 ], [ 1, %bb15 ], [ 0, %bb13 ]
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ret i32 %tmp.0.ph
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}
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