1 ; Test that the memset library call simplifier works correctly. 2 ; 3 ; RUN: opt < %s -instcombine -S | FileCheck %s 4 5 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" 6 7 declare i8* @memset(i8*, i32, i32) 8 9 ; Check memset(mem1, val, size) -> llvm.memset(mem1, val, size, 1). 10 11 define i8* @test_simplify1(i8* %mem, i32 %val, i32 %size) { 12 ; CHECK-LABEL: @test_simplify1( 13 %ret = call i8* @memset(i8* %mem, i32 %val, i32 %size) 14 ; CHECK: call void @llvm.memset 15 ret i8* %ret 16 ; CHECK: ret i8* %mem 17 } 18 19 define i8* @pr25892_lite(i32 %size) #0 { 20 %call1 = call i8* @malloc(i32 %size) #1 21 %call2 = call i8* @memset(i8* %call1, i32 0, i32 %size) #1 22 ret i8* %call2 23 24 ; CHECK-LABEL: @pr25892_lite( 25 ; CHECK-NEXT: %calloc = call i8* @calloc(i32 1, i32 %size) 26 ; CHECK-NEXT: ret i8* %calloc 27 } 28 29 ; FIXME: memset(malloc(x), 0, x) -> calloc(1, x) 30 ; This doesn't fire currently because the malloc has more than one use. 31 32 define float* @pr25892(i32 %size) #0 { 33 entry: 34 %call = tail call i8* @malloc(i32 %size) #1 35 %cmp = icmp eq i8* %call, null 36 br i1 %cmp, label %cleanup, label %if.end 37 if.end: 38 %bc = bitcast i8* %call to float* 39 %call2 = tail call i8* @memset(i8* nonnull %call, i32 0, i32 %size) #1 40 br label %cleanup 41 cleanup: 42 %retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ] 43 ret float* %retval.0 44 45 ; CHECK-LABEL: @pr25892( 46 ; CHECK: entry: 47 ; CHECK-NEXT: %call = tail call i8* @malloc(i32 %size) #1 48 ; CHECK-NEXT: %cmp = icmp eq i8* %call, null 49 ; CHECK-NEXT: br i1 %cmp, label %cleanup, label %if.end 50 ; CHECK: if.end: 51 ; CHECK-NEXT: %bc = bitcast i8* %call to float* 52 ; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull %call, i8 0, i32 %size, i32 1, i1 false) 53 ; CHECK-NEXT: br label %cleanup 54 ; CHECK: cleanup: 55 ; CHECK-NEXT: %retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ] 56 ; CHECK-NEXT: ret float* %retval.0 57 } 58 59 declare noalias i8* @malloc(i32) #1 60 declare i64 @llvm.objectsize.i64.p0i8(i8*, i1) #2 61 62 attributes #0 = { nounwind ssp uwtable } 63 attributes #1 = { nounwind } 64 attributes #2 = { nounwind readnone } 65 66
