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b1f95e7f28
This patch adds a ptrmask intrinsic which allows masking out bits of a pointer that must be zero when accessing it, because of ABI alignment requirements or a restriction of the meaningful bits of a pointer through the data layout. This avoids doing a ptrtoint/inttoptr round trip in some cases (e.g. tagged pointers) and allows us to not lose information about the underlying object. Reviewers: nlopes, efriedma, hfinkel, sanjoy, jdoerfert, aqjune Reviewed by: sanjoy, jdoerfert Differential Revision: https://reviews.llvm.org/D59065 llvm-svn: 368986
30 lines
903 B
LLVM
30 lines
903 B
LLVM
; RUN: llc -mtriple=arm64-apple-iphoneos -stop-after=finalize-isel %s -o - | FileCheck %s
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declare i8* @llvm.ptrmask.p0i8.i64(i8* , i64)
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; CHECK-LABEL: name: test1
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; CHECK: %0:gpr64 = COPY $x0
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; CHECK-NEXT: %1:gpr64sp = ANDXri %0, 8052
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; CHECK-NEXT: $x0 = COPY %1
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; CHECK-NEXT: RET_ReallyLR implicit $x0
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define i8* @test1(i8* %src) {
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%ptr = call i8* @llvm.ptrmask.p0i8.i64(i8* %src, i64 72057594037927928)
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ret i8* %ptr
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}
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declare i8* @llvm.ptrmask.p0i8.i32(i8*, i32)
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; CHECK-LABEL: name: test2
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; CHECK: %0:gpr64 = COPY $x0
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; CHECK-NEXT: %1:gpr32 = MOVi32imm 10000
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; CHECK-NEXT: %2:gpr64 = SUBREG_TO_REG 0, killed %1, %subreg.sub_32
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; CHECK-NEXT: %3:gpr64 = ANDXrr %0, killed %2
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; CHECK-NEXT: $x0 = COPY %3
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; CHECK-NEXT: RET_ReallyLR implicit $x0
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define i8* @test2(i8* %src) {
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%ptr = call i8* @llvm.ptrmask.p0i8.i32(i8* %src, i32 10000)
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ret i8* %ptr
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}
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