56 lines
2.5 KiB
LLVM
56 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; See https://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20210412/904154.html
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; When replacing an allocation that is only modified by a memcpy/memmove from
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; a constant whose alignment is equal to or exceeds that of the allocation,
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; we also need to ensure that we actually can replace all uses of an alloca
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; with said constant. This matters because it could be e.g. a select between
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; two constants, that happens after the first use of an alloca.
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%t0 = type { ptr, i64 }
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@g0 = external constant %t0
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@g1 = external constant %t0
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define void @test(ptr %out) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: [[I0:%.*]] = alloca [[T0:%.*]], align 8
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; CHECK-NEXT: [[I2:%.*]] = call i1 @get_cond()
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; CHECK-NEXT: [[I3:%.*]] = select i1 [[I2]], ptr @g0, ptr @g1
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; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) [[I0]], ptr noundef nonnull align 8 dereferenceable(16) [[I3]], i64 16, i1 false)
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; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 1 dereferenceable(16) [[OUT:%.*]], ptr noundef nonnull align 8 dereferenceable(16) [[I0]], i64 16, i1 false)
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; CHECK-NEXT: ret void
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;
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%i0 = alloca %t0
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%i2 = call i1 @get_cond()
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%i3 = select i1 %i2, ptr @g0, ptr @g1
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call void @llvm.memcpy.p0.p0.i64(ptr %i0, ptr %i3, i64 16, i1 false)
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call void @llvm.memcpy.p0.p0.i64(ptr %out, ptr %i0, i64 16, i1 false)
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ret void
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}
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define void @test2() {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: [[I:%.*]] = alloca [[T0:%.*]], align 8
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; CHECK-NEXT: [[I1:%.*]] = call i32 @func(ptr undef)
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; CHECK-NEXT: [[I2:%.*]] = icmp eq i32 [[I1]], 2503
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; CHECK-NEXT: [[I3:%.*]] = select i1 [[I2]], ptr @g0, ptr @g1
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; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) [[I]], ptr noundef nonnull align 8 dereferenceable(16) [[I3]], i64 16, i1 false)
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; CHECK-NEXT: [[I5:%.*]] = call i32 @func(ptr nonnull byval([[T0]]) [[I]])
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; CHECK-NEXT: unreachable
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;
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bb:
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%i = alloca %t0, align 8
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%i1 = call i32 @func(ptr undef)
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%i2 = icmp eq i32 %i1, 2503
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%i3 = select i1 %i2, ptr @g0, ptr @g1
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call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %i, ptr noundef nonnull align 8 dereferenceable(16) %i3, i64 16, i1 false)
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%i5 = call i32 @func(ptr nonnull byval(%t0) %i)
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unreachable
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}
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declare i32 @func(ptr)
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declare i1 @get_cond()
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declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i1)
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