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https://github.com/c64scene-ar/llvm-6502.git
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19eda5312a
Summary: Extract method haveNoCommonBitsSet so that we don't have to duplicate this logic in InstCombine and SeparateConstOffsetFromGEP. This patch also makes SeparateConstOffsetFromGEP more precise by passing DominatorTree to computeKnownBits. Test Plan: value-tracking-domtree.ll that tests ValueTracking indeed leverages dominating conditions Reviewers: broune, meheff, majnemer Reviewed By: majnemer Subscribers: jholewinski, llvm-commits Differential Revision: http://reviews.llvm.org/D9734 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237407 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
866 B
LLVM
34 lines
866 B
LLVM
; RUN: opt < %s -separate-const-offset-from-gep -value-tracking-dom-conditions -reassociate-geps-verify-no-dead-code -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "nvptx64-unknown-unknown"
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; if (i == 4)
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; p = &input[i | 3];
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;
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; =>
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;
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; if (i == 4) {
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; base = &input[i];
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; p = &base[3];
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; }
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;
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; We should treat (i | 3) as (i + 3) because i is guaranteed to be 4, which
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; does not share any set bits with 3.
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define float* @guarded_or(float* %input, i64 %i) {
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; CHECK-LABEL: @guarded_or(
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entry:
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%is4 = icmp eq i64 %i, 4
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br i1 %is4, label %then, label %exit
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then:
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%or = or i64 %i, 3
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%p = getelementptr inbounds float, float* %input, i64 %or
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; CHECK: [[base:[^ ]+]] = getelementptr float, float* %input, i64 %i
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; CHECK: getelementptr float, float* [[base]], i64 3
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ret float* %p
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exit:
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ret float* null
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}
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