forked from OSchip/llvm-project
89 lines
2.5 KiB
LLVM
89 lines
2.5 KiB
LLVM
; RUN: opt -sroa -S < %s | FileCheck %s
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; This test checks that SROA does not introduce ptrtoint and inttoptr
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; casts from and to non-integral pointers. The "ni:4" bit in the
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; datalayout states that pointers of address space 4 are to be
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; considered "non-integral".
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:4"
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target triple = "x86_64-unknown-linux-gnu"
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define void @f0(i1 %alwaysFalse, i64 %val) {
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; CHECK-LABEL: @f0(
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; CHECK-NOT: inttoptr
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; CHECK-NOT: ptrtoint
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entry:
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%loc = alloca i64
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store i64 %val, i64* %loc
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br i1 %alwaysFalse, label %neverTaken, label %alwaysTaken
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neverTaken:
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%loc.bc = bitcast i64* %loc to i8 addrspace(4)**
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%ptr = load i8 addrspace(4)*, i8 addrspace(4)** %loc.bc
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store i8 5, i8 addrspace(4)* %ptr
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ret void
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alwaysTaken:
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ret void
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}
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define i64 @f1(i1 %alwaysFalse, i8 addrspace(4)* %val) {
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; CHECK-LABEL: @f1(
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; CHECK-NOT: inttoptr
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; CHECK-NOT: ptrtoint
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entry:
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%loc = alloca i8 addrspace(4)*
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store i8 addrspace(4)* %val, i8 addrspace(4)** %loc
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br i1 %alwaysFalse, label %neverTaken, label %alwaysTaken
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neverTaken:
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%loc.bc = bitcast i8 addrspace(4)** %loc to i64*
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%int = load i64, i64* %loc.bc
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ret i64 %int
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alwaysTaken:
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ret i64 42
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}
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define i64 addrspace(4)* @memset(i1 %alwaysFalse) {
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; CHECK-LABEL: @memset(
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; CHECK-NOT: inttoptr
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; CHECK-NOT: ptrtoint
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entry:
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%x = alloca i64 addrspace(4)*
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%cast.0 = bitcast i64 addrspace(4)** %x to i8*
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call void @llvm.memset.p0i8.i64(i8* align 8 %cast.0, i8 5, i64 16, i1 false)
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br i1 %alwaysFalse, label %neverTaken, label %alwaysTaken
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neverTaken:
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%x.field.ld.0 = load i64 addrspace(4)*, i64 addrspace(4)** %x
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ret i64 addrspace(4)* %x.field.ld.0
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alwaysTaken:
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ret i64 addrspace(4)* null
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}
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;; TODO: This one demonstrates a missed oppurtunity. The only known bit
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;; pattern for a non-integral bit pattern is that null is zero. As such
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;; we could do SROA and replace the memset w/a null store. This will
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;; usually be gotten by instcombine.
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define i64 addrspace(4)* @memset_null(i1 %alwaysFalse) {
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; CHECK-LABEL: @memset_null(
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; CHECK-NOT: inttoptr
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; CHECK-NOT: ptrtoint
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entry:
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%x = alloca i64 addrspace(4)*
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%cast.0 = bitcast i64 addrspace(4)** %x to i8*
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call void @llvm.memset.p0i8.i64(i8* align 8 %cast.0, i8 0, i64 16, i1 false)
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br i1 %alwaysFalse, label %neverTaken, label %alwaysTaken
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neverTaken:
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%x.field.ld.0 = load i64 addrspace(4)*, i64 addrspace(4)** %x
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ret i64 addrspace(4)* %x.field.ld.0
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alwaysTaken:
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ret i64 addrspace(4)* null
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}
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declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i1)
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