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[ARM] Use generic bitreverse intrinsic, rather than ARM specific rbit. 

The backend already supports lowering this intrinsic to a rbit instruction.

llvm-svn: 291582
This commit is contained in:
Chad Rosier 2017-01-10 18:55:11 +00:00
parent dc9834f912
commit c22abb3820
3 changed files with 8 additions and 8 deletions
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6
clang/lib/CodeGen/CGBuiltin.cpp
View File

@ -4318,9 +4318,9 @@ Value *CodeGenFunction::EmitARMBuiltinExpr(unsigned BuiltinID,
}
if (BuiltinID == ARM::BI__builtin_arm_rbit) {
return Builder.CreateCall(CGM.getIntrinsic(Intrinsic::arm_rbit),
EmitScalarExpr(E->getArg(0)),
"rbit");
llvm::Value *Arg = EmitScalarExpr(E->getArg(0));
return Builder.CreateCall(
CGM.getIntrinsic(Intrinsic::bitreverse, Arg->getType()), Arg, "rbit");
}
if (BuiltinID == ARM::BI__clear_cache) {

8
clang/test/CodeGen/arm_acle.c
View File

@ -244,22 +244,22 @@ int16_t test_revsh(int16_t t) {
}
// ARM-LABEL: test_rbit
// AArch32: call i32 @llvm.arm.rbit
// AArch32: call i32 @llvm.bitreverse.i32
// AArch64: call i32 @llvm.bitreverse.i32
uint32_t test_rbit(uint32_t t) {
return __rbit(t);
}
// ARM-LABEL: test_rbitl
// AArch32: call i32 @llvm.arm.rbit
// AArch32: call i32 @llvm.bitreverse.i32
// AArch64: call i64 @llvm.bitreverse.i64
long test_rbitl(long t) {
return __rbitl(t);
}
// ARM-LABEL: test_rbitll
// AArch32: call i32 @llvm.arm.rbit
// AArch32: call i32 @llvm.arm.rbit
// AArch32: call i32 @llvm.bitreverse.i32
// AArch32: call i32 @llvm.bitreverse.i32
// AArch64: call i64 @llvm.bitreverse.i64
uint64_t test_rbitll(uint64_t t) {
return __rbitll(t);

2
clang/test/CodeGen/builtins-arm.c
View File

@ -68,7 +68,7 @@ void test_barrier() {
__builtin_arm_isb(3); //CHECK: call {{.*}} @llvm.arm.isb(i32 3)
}
// CHECK: call {{.*}} @llvm.arm.rbit(i32 %a)
// CHECK: call {{.*}} @llvm.bitreverse.i32(i32 %a)
unsigned rbit(unsigned a) {
return __builtin_arm_rbit(a);