8086f9d87e
MSVC-style RTTI produces loads through a GEP of a local alias which itself is a GEP. Currently we aren't able to devirtualize any virtual calls when MSVC RTTI is enabled. This patch attempts to simplify a load's GEP operand by calling SymbolicallyEvaluateGEP() with an option to look through local aliases. Differential Revision: https://reviews.llvm.org/D101100
36 lines
1.1 KiB
LLVM
36 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=instsimplify -S < %s | FileCheck %s
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@a1 = internal alias i32, getelementptr ({[3 x i32]}, {[3 x i32]}* @b, i32 0, i32 0, i32 1)
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@a2 = weak alias i32, getelementptr ({[3 x i32]}, {[3 x i32]}* @b, i32 0, i32 0, i32 1)
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@b = internal constant {[3 x i32]} {[3 x i32] [i32 2, i32 3, i32 4]}
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@c = internal alias i32, getelementptr ({[3 x i32]}, {[3 x i32]}* @d, i32 0, i32 0, i32 1)
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@d = weak constant {[3 x i32]} {[3 x i32] [i32 2, i32 3, i32 4]}
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define i32 @f() {
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; CHECK-LABEL: @f(
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; CHECK-NEXT: ret i32 4
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;
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%a = load i32, i32* getelementptr (i32, i32* @a1, i64 1)
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ret i32 %a
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}
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define i32 @g() {
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; CHECK-LABEL: @g(
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; CHECK-NEXT: [[A:%.*]] = load i32, i32* getelementptr (i32, i32* @a2, i64 1), align 4
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; CHECK-NEXT: ret i32 [[A]]
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;
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%a = load i32, i32* getelementptr (i32, i32* @a2, i64 1)
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ret i32 %a
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}
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define i32 @h() {
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; CHECK-LABEL: @h(
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; CHECK-NEXT: [[A:%.*]] = load i32, i32* getelementptr (i32, i32* @c, i64 1), align 4
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; CHECK-NEXT: ret i32 [[A]]
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;
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%a = load i32, i32* getelementptr (i32, i32* @c, i64 1)
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ret i32 %a
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}
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