60 lines
2.9 KiB
LLVM
60 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -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 { i8*, i64 }
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@g0 = external constant %t0
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@g1 = external constant %t0
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define void @test(i8*%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: [[I1:%.*]] = bitcast %t0* [[I0]] to i8*
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; CHECK-NEXT: [[I2:%.*]] = call i1 @get_cond()
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; CHECK-NEXT: [[I3:%.*]] = select i1 [[I2]], i8* bitcast (%t0* @g0 to i8*), i8* bitcast (%t0* @g1 to i8*)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* noundef nonnull align 8 dereferenceable(16) [[I1]], i8* noundef nonnull align 8 dereferenceable(16) [[I3]], i64 16, i1 false)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* noundef nonnull align 1 dereferenceable(16) [[OUT:%.*]], i8* noundef nonnull align 8 dereferenceable(16) [[I1]], 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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%i1 = bitcast %t0* %i0 to i8*
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%i2 = call i1 @get_cond()
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%i3 = select i1 %i2, i8* bitcast (%t0* @g0 to i8*), i8* bitcast (%t0* @g1 to i8*)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %i1, i8* %i3, i64 16, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out, i8* %i1, 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(%t0* undef)
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; CHECK-NEXT: [[I2:%.*]] = icmp eq i32 [[I1]], 2503
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; CHECK-NEXT: [[I3:%.*]] = select i1 [[I2]], i8* bitcast (%t0* @g0 to i8*), i8* bitcast (%t0* @g1 to i8*)
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; CHECK-NEXT: [[I4:%.*]] = bitcast %t0* [[I]] to i8*
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* noundef nonnull align 8 dereferenceable(16) [[I4]], i8* noundef nonnull align 8 dereferenceable(16) [[I3]], i64 16, i1 false)
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; CHECK-NEXT: [[I5:%.*]] = call i32 @func(%t0* 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(%t0* undef)
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%i2 = icmp eq i32 %i1, 2503
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%i3 = select i1 %i2, i8* bitcast (%t0* @g0 to i8*), i8* bitcast (%t0* @g1 to i8*)
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%i4 = bitcast %t0* %i to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* noundef nonnull align 8 dereferenceable(16) %i4, i8* noundef nonnull align 8 dereferenceable(16) %i3, i64 16, i1 false)
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%i5 = call i32 @func(%t0* nonnull byval(%t0) %i)
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unreachable
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}
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declare i32 @func(%t0*)
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declare i1 @get_cond()
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i1)
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