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2819145e6a
Summary: Teach `computeKnownBitsFromRangeMetadata` to use `!range` metadata more aggressively. Reviewers: majnemer, nlewycky, jingyue Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D14100 llvm-svn: 251487
35 lines
709 B
LLVM
35 lines
709 B
LLVM
; RUN: opt -S -instsimplify < %s | FileCheck %s
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define i1 @test0(i8* %ptr) {
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; CHECK-LABEL: @test0(
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entry:
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%val = load i8, i8* %ptr, !range !{i8 -50, i8 0}
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%and = and i8 %val, 128
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%is.eq = icmp eq i8 %and, 128
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ret i1 %is.eq
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; CHECK: ret i1 true
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}
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define i1 @test1(i8* %ptr) {
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; CHECK-LABEL: @test1(
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entry:
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%val = load i8, i8* %ptr, !range !{i8 64, i8 128}
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%and = and i8 %val, 64
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%is.eq = icmp eq i8 %and, 64
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ret i1 %is.eq
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; CHECK: ret i1 true
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}
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define i1 @test2(i8* %ptr) {
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; CHECK-LABEL: @test2(
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entry:
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; CHECK: load
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; CHECK: and
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; CHECK: icmp eq
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; CHECK: ret
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%val = load i8, i8* %ptr, !range !{i8 64, i8 129}
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%and = and i8 %val, 64
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%is.eq = icmp eq i8 %and, 64
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ret i1 %is.eq
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}
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