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