66 lines
2.5 KiB
LLVM
66 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test that the memcpy library call simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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declare i8* @memcpy(i8*, i8*, i32)
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; Check memcpy(mem1, mem2, size) -> llvm.memcpy(mem1, mem2, size, 1).
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define i8* @test_simplify1(i8* %mem1, i8* %mem2, i32 %size) {
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; CHECK-LABEL: @test_simplify1(
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[MEM1:%.*]], i8* align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
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; CHECK-NEXT: ret i8* [[MEM1]]
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;
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%ret = call i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size)
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ret i8* %ret
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}
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; Verify that the strictfp attr doesn't block this optimization.
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define i8* @test_simplify2(i8* %mem1, i8* %mem2, i32 %size) strictfp {
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; CHECK-LABEL: @test_simplify2(
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[MEM1:%.*]], i8* align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false) #[[ATTR0:[0-9]+]]
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; CHECK-NEXT: ret i8* [[MEM1]]
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;
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%ret = call i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size) strictfp
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ret i8* %ret
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}
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; Verify that the first parameter to memcpy could itself be a call that's not
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; tail, while the call to @memcpy could be tail.
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declare i8* @get_dest()
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define i8* @test_simplify3(i8* %mem2, i32 %size) {
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; CHECK-LABEL: @test_simplify3(
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; CHECK-NEXT: [[DEST:%.*]] = call i8* @get_dest()
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; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[DEST]], i8* align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
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; CHECK-NEXT: ret i8* [[DEST]]
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;
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%dest = call i8* @get_dest()
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%ret = tail call i8* @memcpy(i8* %dest, i8* %mem2, i32 %size)
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ret i8* %ret
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}
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define i8* @test_no_incompatible_attr(i8* %mem1, i8* %mem2, i32 %size) {
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; CHECK-LABEL: @test_no_incompatible_attr(
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[MEM1:%.*]], i8* align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
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; CHECK-NEXT: ret i8* [[MEM1]]
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;
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%ret = call dereferenceable(1) i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size)
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ret i8* %ret
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}
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define i8* @test_no_simplify1(i8* %mem1, i8* %mem2, i32 %size) {
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; CHECK-LABEL: @test_no_simplify1(
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; CHECK-NEXT: [[RET:%.*]] = musttail call i8* @memcpy(i8* [[MEM1:%.*]], i8* [[MEM2:%.*]], i32 [[SIZE:%.*]])
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; CHECK-NEXT: ret i8* [[RET]]
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;
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%ret = musttail call i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size)
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ret i8* %ret
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}
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