forked from OSchip/llvm-project
109 lines
4.1 KiB
LLVM
109 lines
4.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test that the memset 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* @memset(i8*, i32, i32)
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declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i32, i1)
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declare noalias i8* @malloc(i32) #1
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; Check memset(mem1, val, size) -> llvm.memset(mem1, val, size, 1).
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define i8* @test_simplify1(i8* %mem, i32 %val, i32 %size) {
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; CHECK-LABEL: @test_simplify1(
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[VAL:%.*]] to i8
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; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[MEM:%.*]], i8 [[TMP1]], i32 [[SIZE:%.*]], i1 false)
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; CHECK-NEXT: ret i8* [[MEM]]
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;
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%ret = call i8* @memset(i8* %mem, i32 %val, i32 %size)
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ret i8* %ret
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}
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define i8* @pr25892_lite(i32 %size) #0 {
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; CHECK-LABEL: @pr25892_lite(
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; CHECK-NEXT: [[CALLOC:%.*]] = call i8* @calloc(i32 1, i32 [[SIZE:%.*]])
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; CHECK-NEXT: ret i8* [[CALLOC]]
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;
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%call1 = call i8* @malloc(i32 %size) #1
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%call2 = call i8* @memset(i8* %call1, i32 0, i32 %size) #1
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ret i8* %call2
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}
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; FIXME: A memset intrinsic should be handled similarly to a memset() libcall.
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define i8* @malloc_and_memset_intrinsic(i32 %n) #0 {
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; CHECK-LABEL: @malloc_and_memset_intrinsic(
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; CHECK-NEXT: [[CALL:%.*]] = call i8* @malloc(i32 [[N:%.*]])
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; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[CALL]], i8 0, i32 [[N]], i1 false)
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; CHECK-NEXT: ret i8* [[CALL]]
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;
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%call = call i8* @malloc(i32 %n)
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call void @llvm.memset.p0i8.i32(i8* %call, i8 0, i32 %n, i32 1, i1 false)
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ret i8* %call
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}
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; This should not create a calloc and should not crash the compiler.
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define i8* @notmalloc_memset(i32 %size, i8*(i32)* %notmalloc) {
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; CHECK-LABEL: @notmalloc_memset(
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; CHECK-NEXT: [[CALL1:%.*]] = call i8* [[NOTMALLOC:%.*]](i32 [[SIZE:%.*]]) #0
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; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[CALL1]], i8 0, i32 [[SIZE]], i1 false)
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; CHECK-NEXT: ret i8* [[CALL1]]
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;
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%call1 = call i8* %notmalloc(i32 %size) #1
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%call2 = call i8* @memset(i8* %call1, i32 0, i32 %size) #1
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ret i8* %call2
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}
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; FIXME: memset(malloc(x), 0, x) -> calloc(1, x)
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; This doesn't fire currently because the malloc has more than one use.
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define float* @pr25892(i32 %size) #0 {
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; CHECK-LABEL: @pr25892(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CALL:%.*]] = tail call i8* @malloc(i32 [[SIZE:%.*]]) #0
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[CALL]], null
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; CHECK-NEXT: br i1 [[CMP]], label [[CLEANUP:%.*]], label [[IF_END:%.*]]
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; CHECK: if.end:
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; CHECK-NEXT: [[BC:%.*]] = bitcast i8* [[CALL]] to float*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[CALL]], i8 0, i32 [[SIZE]], i1 false)
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; CHECK-NEXT: br label [[CLEANUP]]
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; CHECK: cleanup:
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; CHECK-NEXT: [[RETVAL_0:%.*]] = phi float* [ [[BC]], [[IF_END]] ], [ null, [[ENTRY:%.*]] ]
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; CHECK-NEXT: ret float* [[RETVAL_0]]
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;
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entry:
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%call = tail call i8* @malloc(i32 %size) #1
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%cmp = icmp eq i8* %call, null
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br i1 %cmp, label %cleanup, label %if.end
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if.end:
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%bc = bitcast i8* %call to float*
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%call2 = tail call i8* @memset(i8* nonnull %call, i32 0, i32 %size) #1
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br label %cleanup
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cleanup:
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%retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ]
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ret float* %retval.0
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}
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; If there's a calloc transform, the store must also be eliminated.
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define i8* @buffer_is_modified_then_memset(i32 %size) {
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; CHECK-LABEL: @buffer_is_modified_then_memset(
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; CHECK-NEXT: [[PTR:%.*]] = tail call i8* @malloc(i32 [[SIZE:%.*]]) #0
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; CHECK-NEXT: store i8 1, i8* [[PTR]], align 1
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; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[PTR]], i8 0, i32 [[SIZE]], i1 false)
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; CHECK-NEXT: ret i8* [[PTR]]
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;
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%ptr = tail call i8* @malloc(i32 %size) #1
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store i8 1, i8* %ptr ;; fdata[0] = 1;
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%memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
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ret i8* %memset
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}
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attributes #0 = { nounwind ssp uwtable }
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attributes #1 = { nounwind }
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attributes #2 = { nounwind readnone }
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