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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature
; RUN: opt < %s -passes='require<globals-aa>,memcpyopt' -S -verify-memoryssa | FileCheck %s
target datalayout = "e"
declare void @foo(ptr)
declare void @llvm.memcpy.p0.p0.i32(ptr nocapture, ptr nocapture, i32, i1) nounwind
declare void @llvm.lifetime.start.p0(ptr nocapture)
declare void @llvm.lifetime.end.p0(ptr nocapture)
; Check that the transformation isn't applied if the called function can
; capture the pointer argument (i.e. the nocapture attribute isn't present)
define void @test() {
; CHECK-LABEL: define {{[^@]+}}@test() {
; CHECK-NEXT: [[PTR1:%.*]] = alloca i8, align 1
; CHECK-NEXT: [[PTR2:%.*]] = alloca i8, align 1
; CHECK-NEXT: call void @foo(ptr [[PTR2]])
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[PTR1]], ptr [[PTR2]], i32 1, i1 false)
; CHECK-NEXT: call void @foo(ptr [[PTR1]])
; CHECK-NEXT: ret void
;
%ptr1 = alloca i8
%ptr2 = alloca i8
call void @foo(ptr %ptr2)
call void @llvm.memcpy.p0.p0.i32(ptr %ptr1, ptr %ptr2, i32 1, i1 false)
call void @foo(ptr %ptr1)
ret void
}
; Same as previous test, but with a bitcasted argument.
define void @test_bitcast() {
; CHECK-LABEL: define {{[^@]+}}@test_bitcast() {
; CHECK-NEXT: [[PTR1:%.*]] = alloca [2 x i8], align 1
; CHECK-NEXT: [[PTR2:%.*]] = alloca [2 x i8], align 1
; CHECK-NEXT: call void @foo(ptr [[PTR2]])
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[PTR1]], ptr [[PTR2]], i32 2, i1 false)
; CHECK-NEXT: call void @foo(ptr [[PTR1]])
; CHECK-NEXT: ret void
;
%ptr1 = alloca [2 x i8]
%ptr2 = alloca [2 x i8]
call void @foo(ptr %ptr2)
call void @llvm.memcpy.p0.p0.i32(ptr %ptr1, ptr %ptr2, i32 2, i1 false)
call void @foo(ptr %ptr1)
ret void
}
; Lifetime of %ptr2 ends before the potential use of the capture in the second
; call.
define void @test_lifetime_end() {
; CHECK-LABEL: define {{[^@]+}}@test_lifetime_end() {
; CHECK-NEXT: [[PTR1:%.*]] = alloca i8, align 1
; CHECK-NEXT: [[PTR2:%.*]] = alloca i8, align 1
; CHECK-NEXT: call void @llvm.lifetime.start.p0(ptr [[PTR2]])
; CHECK-NEXT: call void @foo(ptr [[PTR1]])
; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr [[PTR2]])
; CHECK-NEXT: call void @foo(ptr [[PTR1]])
; CHECK-NEXT: ret void
;
%ptr1 = alloca i8
%ptr2 = alloca i8
call void @llvm.lifetime.start.p0(ptr %ptr2)
call void @foo(ptr %ptr2)
call void @llvm.memcpy.p0.p0.i32(ptr %ptr1, ptr %ptr2, i32 1, i1 false)
call void @llvm.lifetime.end.p0(ptr %ptr2)
call void @foo(ptr %ptr1)
ret void
}
; Lifetime of %ptr2 ends before any potential use of the capture because we
; return from the function.
define void @test_function_end() {
; CHECK-LABEL: define {{[^@]+}}@test_function_end() {
; CHECK-NEXT: [[PTR1:%.*]] = alloca i8, align 1
; CHECK-NEXT: [[PTR2:%.*]] = alloca i8, align 1
; CHECK-NEXT: call void @foo(ptr [[PTR1]])
; CHECK-NEXT: ret void
;
%ptr1 = alloca i8
%ptr2 = alloca i8
call void @foo(ptr %ptr2)
call void @llvm.memcpy.p0.p0.i32(ptr %ptr1, ptr %ptr2, i32 1, i1 false)
ret void
}
; A potential use of the capture occurs in a later block, can't be optimized.
define void @test_terminator() {
; CHECK-LABEL: define {{[^@]+}}@test_terminator() {
; CHECK-NEXT: [[PTR1:%.*]] = alloca i8, align 1
; CHECK-NEXT: [[PTR2:%.*]] = alloca i8, align 1
; CHECK-NEXT: call void @foo(ptr [[PTR2]])
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[PTR1]], ptr [[PTR2]], i32 1, i1 false)
; CHECK-NEXT: br label [[NEXT:%.*]]
; CHECK: next:
; CHECK-NEXT: call void @foo(ptr [[PTR1]])
; CHECK-NEXT: ret void
;
%ptr1 = alloca i8
%ptr2 = alloca i8
call void @foo(ptr %ptr2)
call void @llvm.memcpy.p0.p0.i32(ptr %ptr1, ptr %ptr2, i32 1, i1 false)
br label %next
next:
call void @foo(ptr %ptr1)
ret void
}
; This case can be optimized, but would require a scan across multiple blocks
; and is currently not performed.
define void @test_terminator2() {
; CHECK-LABEL: define {{[^@]+}}@test_terminator2() {
; CHECK-NEXT: [[PTR1:%.*]] = alloca i8, align 1
; CHECK-NEXT: [[PTR2:%.*]] = alloca i8, align 1
; CHECK-NEXT: call void @foo(ptr [[PTR2]])
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[PTR1]], ptr [[PTR2]], i32 1, i1 false)
; CHECK-NEXT: br label [[NEXT:%.*]]
; CHECK: next:
; CHECK-NEXT: ret void
;
%ptr1 = alloca i8
%ptr2 = alloca i8
call void @foo(ptr %ptr2)
call void @llvm.memcpy.p0.p0.i32(ptr %ptr1, ptr %ptr2, i32 1, i1 false)
br label %next
next:
ret void
}
declare void @capture(ptr)
; This case should not be optimized, because dest is captured before the call.
define void @test_dest_captured_before_alloca() {
; CHECK-LABEL: define {{[^@]+}}@test_dest_captured_before_alloca() {
; CHECK-NEXT: [[PTR1:%.*]] = alloca i8, align 1
; CHECK-NEXT: [[PTR2:%.*]] = alloca i8, align 1
; CHECK-NEXT: call void @capture(ptr [[PTR1]])
; CHECK-NEXT: call void @foo(ptr [[PTR2]]) #[[ATTR2:[0-9]+]]
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr [[PTR1]], ptr [[PTR2]], i32 1, i1 false)
; CHECK-NEXT: ret void
;
%ptr1 = alloca i8
%ptr2 = alloca i8
call void @capture(ptr %ptr1)
call void @foo(ptr %ptr2) argmemonly
call void @llvm.memcpy.p0.p0.i32(ptr %ptr1, ptr %ptr2, i32 1, i1 false)
ret void
}
@g = internal global i8 0
; This case should not be optimized, because @g is captured before the call
; (being a global) and @icmp_g might depend on its identity.
define void @test_dest_captured_before_global() {
; CHECK-LABEL: define {{[^@]+}}@test_dest_captured_before_global() {
; CHECK-NEXT: [[PTR:%.*]] = alloca i8, align 1
; CHECK-NEXT: call void @icmp_g(ptr [[PTR]])
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr @g, ptr [[PTR]], i32 1, i1 false)
; CHECK-NEXT: ret void
;
%ptr = alloca i8
call void @icmp_g(ptr %ptr)
call void @llvm.memcpy.p0.p0.i32(ptr @g, ptr %ptr, i32 1, i1 false)
ret void
}
define void @icmp_g(ptr %p) {
; CHECK-LABEL: define {{[^@]+}}@icmp_g
; CHECK-SAME: (ptr [[P:%.*]]) {
; CHECK-NEXT: [[C:%.*]] = icmp eq ptr [[P]], @g
; CHECK-NEXT: br i1 [[C]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: store i8 1, ptr [[P]], align 1
; CHECK-NEXT: ret void
; CHECK: else:
; CHECK-NEXT: store i8 2, ptr [[P]], align 1
; CHECK-NEXT: ret void
;
%c = icmp eq ptr %p, @g
br i1 %c, label %if, label %else
if:
store i8 1, ptr %p
ret void
else:
store i8 2, ptr %p
ret void
}
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