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