forked from OSchip/llvm-project
66 lines
2.1 KiB
LLVM
66 lines
2.1 KiB
LLVM
; 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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; 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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%ret = call i8* @memset(i8* %mem, i32 %val, i32 %size)
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; CHECK: call void @llvm.memset
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ret i8* %ret
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; CHECK: ret i8* %mem
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}
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define i8* @pr25892_lite(i32 %size) #0 {
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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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; 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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; 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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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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; CHECK-LABEL: @pr25892(
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; CHECK: entry:
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; CHECK-NEXT: %call = tail call i8* @malloc(i32 %size) #1
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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 %call, i8 0, i32 %size, i32 1, 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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declare noalias i8* @malloc(i32) #1
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declare i64 @llvm.objectsize.i64.p0i8(i8*, i1) #2
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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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