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59318e2605
For any @llvm.assume intrinsic, if there is another which dominates it and uses the same condition, then it is redundant and can be removed. While this does not alter the semantics of the @llvm.assume intrinsics, it makes subsequent handling more efficient (and the resulting IR easier to read). llvm-svn: 219067
56 lines
2.0 KiB
LLVM
56 lines
2.0 KiB
LLVM
; RUN: opt -domtree -instcombine -loops -S < %s | FileCheck %s
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; Note: The -loops above can be anything that requires the domtree, and is
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; necessary to work around a pass-manager bug.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%struct.s = type { double* }
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; Function Attrs: nounwind uwtable
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define void @_Z3fooR1s(%struct.s* nocapture readonly dereferenceable(8) %x) #0 {
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; CHECK-LABEL: @_Z3fooR1s
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; CHECK: call void @llvm.assume
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; CHECK-NOT: call void @llvm.assume
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entry:
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%a = getelementptr inbounds %struct.s* %x, i64 0, i32 0
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%0 = load double** %a, align 8
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%ptrint = ptrtoint double* %0 to i64
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%maskedptr = and i64 %ptrint, 31
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%maskcond = icmp eq i64 %maskedptr, 0
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next.1, %for.body ]
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tail call void @llvm.assume(i1 %maskcond)
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%arrayidx = getelementptr inbounds double* %0, i64 %indvars.iv
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%1 = load double* %arrayidx, align 16
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%add = fadd double %1, 1.000000e+00
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tail call void @llvm.assume(i1 %maskcond)
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%mul = fmul double %add, 2.000000e+00
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store double %mul, double* %arrayidx, align 16
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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tail call void @llvm.assume(i1 %maskcond)
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%arrayidx.1 = getelementptr inbounds double* %0, i64 %indvars.iv.next
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%2 = load double* %arrayidx.1, align 8
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%add.1 = fadd double %2, 1.000000e+00
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tail call void @llvm.assume(i1 %maskcond)
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%mul.1 = fmul double %add.1, 2.000000e+00
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store double %mul.1, double* %arrayidx.1, align 8
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%indvars.iv.next.1 = add nuw nsw i64 %indvars.iv.next, 1
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%exitcond.1 = icmp eq i64 %indvars.iv.next, 1599
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br i1 %exitcond.1, 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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; Function Attrs: nounwind
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declare void @llvm.assume(i1) #1
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attributes #0 = { nounwind uwtable }
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attributes #1 = { nounwind }
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