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b6e7ff238c
This patch does the following things: 1. update SymbolicallyEvaluateGEP so that it bails out if it cannot preserve inrange arribute; 2. update llvm/test/Analysis/ConstantFolding/gep.ll to remove UB in it; 3. remove inaccurate comment above ConstantFoldInstOperandsImpl in llvm/lib/Analysis/ConstantFolding.cpp; 4. add a new regression test that makes sure that no optimizations change an inrange GEP in an unexpected way. Patch by Zhaomo Yang! Differential Revision: https://reviews.llvm.org/D51698 llvm-svn: 341888
28 lines
1.5 KiB
LLVM
28 lines
1.5 KiB
LLVM
; RUN: opt -instcombine -S -o - %s | FileCheck %s
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; Tests that we preserve the inrange attribute on indices where possible.
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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.A = type { i32 (...)** }
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@vt = external global [3 x i8*]
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; CHECK: define i32 (...)** @f0()
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define i32 (...)** @f0() {
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; CHECK-NEXT: ret i32 (...)** bitcast (i8** getelementptr inbounds ([3 x i8*], [3 x i8*]* @vt, inrange i64 0, i64 2) to i32 (...)**
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ret i32 (...)** getelementptr (i32 (...)*, i32 (...)** bitcast (i8** getelementptr inbounds ([3 x i8*], [3 x i8*]* @vt, inrange i64 0, i64 1) to i32 (...)**), i64 1)
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}
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; CHECK: define i32 (...)** @f1()
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define i32 (...)** @f1() {
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; CHECK-NEXT: ret i32 (...)** getelementptr (i32 (...)*, i32 (...)** bitcast (i8** getelementptr inbounds ([3 x i8*], [3 x i8*]* @vt, i64 0, inrange i64 1) to i32 (...)**), i64 1)
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ret i32 (...)** getelementptr (i32 (...)*, i32 (...)** bitcast (i8** getelementptr inbounds ([3 x i8*], [3 x i8*]* @vt, i64 0, inrange i64 1) to i32 (...)**), i64 1)
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}
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; CHECK: define i32 (...)** @f2()
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define i32 (...)** @f2() {
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; CHECK-NEXT: ret i32 (...)** getelementptr (i32 (...)*, i32 (...)** bitcast (i8** getelementptr inbounds ([3 x i8*], [3 x i8*]* @vt, i64 0, inrange i64 1) to i32 (...)**), i64 3)
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ret i32 (...)** getelementptr (i32 (...)*, i32 (...)** bitcast (i8** getelementptr inbounds ([3 x i8*], [3 x i8*]* @vt, i64 0, inrange i64 1) to i32 (...)**), i64 3)
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}
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