derek.holloway
7502bf64a4
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57 lines
1.8 KiB
LLVM
57 lines
1.8 KiB
LLVM
; RUN: opt < %s -passes=indvars -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-n32:64"
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; Indvars should be able to fold IV increments into shr when low bits are zero.
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;
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; CHECK-LABEL: @foldIncShr(
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; CHECK: shr.1 = lshr i32 %0, 5
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define i32 @foldIncShr(ptr %bitmap, i32 %bit_addr, i32 %nbits) nounwind {
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entry:
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br label %while.body
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while.body:
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%0 = phi i32 [ 0, %entry ], [ %inc.2, %while.body ]
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%shr = lshr i32 %0, 5
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%arrayidx = getelementptr inbounds i32, ptr %bitmap, i32 %shr
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%tmp6 = load i32, ptr %arrayidx, align 4
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%inc.1 = add i32 %0, 1
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%shr.1 = lshr i32 %inc.1, 5
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%arrayidx.1 = getelementptr inbounds i32, ptr %bitmap, i32 %shr.1
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%tmp6.1 = load i32, ptr %arrayidx.1, align 4
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%inc.2 = add i32 %inc.1, 1
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%exitcond.3 = icmp eq i32 %inc.2, 128
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br i1 %exitcond.3, label %while.end, label %while.body
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while.end:
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%r = add i32 %tmp6, %tmp6.1
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ret i32 %r
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}
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; Invdars should not fold an increment into shr unless 2^shiftBits is
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; a multiple of the recurrence step.
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;
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; CHECK-LABEL: @noFoldIncShr(
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; CHECK: shr.1 = lshr i32 %inc.1, 5
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define i32 @noFoldIncShr(ptr %bitmap, i32 %bit_addr, i32 %nbits) nounwind {
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entry:
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br label %while.body
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while.body:
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%0 = phi i32 [ 0, %entry ], [ %inc.3, %while.body ]
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%shr = lshr i32 %0, 5
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%arrayidx = getelementptr inbounds i32, ptr %bitmap, i32 %shr
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%tmp6 = load i32, ptr %arrayidx, align 4
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%inc.1 = add i32 %0, 1
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%shr.1 = lshr i32 %inc.1, 5
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%arrayidx.1 = getelementptr inbounds i32, ptr %bitmap, i32 %shr.1
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%tmp6.1 = load i32, ptr %arrayidx.1, align 4
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%inc.3 = add i32 %inc.1, 2
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%exitcond.3 = icmp eq i32 %inc.3, 96
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br i1 %exitcond.3, label %while.end, label %while.body
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while.end:
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%r = add i32 %tmp6, %tmp6.1
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ret i32 %r
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}
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