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[ARM] Lower modulo operation to generate __aeabi_divmod on Android

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For a modulo (reminder) operation,
clang -target armv7-none-linux-gnueabi generates "__modsi3"
clang -target armv7-none-eabi generates "__aeabi_idivmod"
clang -target armv7-linux-androideabi generates "__modsi3"
Android bionic libc doesn't provide a __modsi3, instead it provides a
"__aeabi_idivmod". This patch fixes the LLVM ARMISelLowering to generate
the correct call when ever there is a modulo operation.

Differential Revision: http://reviews.llvm.org/D11661


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243717 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sumanth Gundapaneni 2015-07-31 00:45:12 +00:00
parent 2623dd4454
commit 8d13756ddd
2 changed files with 6 additions and 3 deletions
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7
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -735,11 +735,11 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM,
setOperationAction(ISD::UDIV, MVT::i32, Expand);
}
// FIXME: Also set divmod for SREM on EABI
// FIXME: Also set divmod for SREM on EABI/androideabi
setOperationAction(ISD::SREM, MVT::i32, Expand);
setOperationAction(ISD::UREM, MVT::i32, Expand);
// Register based DivRem for AEABI (RTABI 4.2)
if (Subtarget->isTargetAEABI()) {
if (Subtarget->isTargetAEABI() || Subtarget->isTargetAndroid()) {
setLibcallName(RTLIB::SDIVREM_I8, "__aeabi_idivmod");
setLibcallName(RTLIB::SDIVREM_I16, "__aeabi_idivmod");
setLibcallName(RTLIB::SDIVREM_I32, "__aeabi_idivmod");
@ -11159,7 +11159,8 @@ void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
}
SDValue ARMTargetLowering::LowerDivRem(SDValue Op, SelectionDAG &DAG) const {
assert(Subtarget->isTargetAEABI() && "Register-based DivRem lowering only");
assert((Subtarget->isTargetAEABI() || Subtarget->isTargetAndroid()) &&
"Register-based DivRem lowering only");
unsigned Opcode = Op->getOpcode();
assert((Opcode == ISD::SDIVREM || Opcode == ISD::UDIVREM) &&
"Invalid opcode for Div/Rem lowering");

2
test/CodeGen/ARM/divmod-eabi.ll
View File

@ -1,5 +1,7 @@
; RUN: llc -mtriple armv7-none-eabi %s -o - | FileCheck %s --check-prefix=EABI
; RUN: llc -mtriple armv7-none-eabihf %s -o - | FileCheck %s --check-prefix=EABI
; Both "none-eabi" and "androideabi" must lower SREM/UREM to __aeabi_{u,i}divmod
; RUN: llc -mtriple armv7-linux-androideabi %s -o - | FileCheck %s --check-prefix=EABI
; RUN: llc -mtriple armv7-linux-gnueabi %s -o - | FileCheck %s --check-prefix=GNU
; RUN: llc -mtriple armv7-apple-darwin %s -o - | FileCheck %s --check-prefix=DARWIN
; FIXME: long-term, we will use "-apple-macho" and won't need this exception: