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[clang] Incorrect IR involving the use of bcopy #79298

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Merged
merged 1 commit into from
Jan 24, 2024
Merged

[clang] Incorrect IR involving the use of bcopy #79298

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2 changes: 1 addition & 1 deletion clang/lib/CodeGen/CGBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4011,7 +4011,7 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
EmitNonNullArgCheck(RValue::get(Dest.getPointer()), E->getArg(1)->getType(),
E->getArg(1)->getExprLoc(), FD, 0);
Builder.CreateMemMove(Dest, Src, SizeVal, false);
return RValue::get(Dest.getPointer());
return RValue::get(nullptr);
}

case Builtin::BImemcpy:
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15 changes: 15 additions & 0 deletions clang/test/CodeGen/builtins.c
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Expand Up @@ -202,6 +202,21 @@ void test_conditional_bzero(void) {
// CHECK-NOT: phi
}

// CHECK-LABEL: define{{.*}} void @test_conditional_bcopy
void test_conditional_bcopy(void) {
char dst[20];
char src[20];
int _sz = 20, len = 20;
return (_sz
? ((_sz >= len)
? __builtin_bcopy(src, dst, len)
: foo())
: __builtin_bcopy(src, dst, len));
// CHECK: call void @llvm.memmove
// CHECK: call void @llvm.memmove
// CHECK-NOT: phi
}

// CHECK-LABEL: define{{.*}} void @test_float_builtins
void test_float_builtins(__fp16 *H, float F, double D, long double LD) {
volatile int res;
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