// If the tailcall address may be in a register, then make sure it's
// possible to register allocate for it. In 32-bit, the call address can
// only target EAX, EDX, or ECX since the tail call must be scheduled after
- // callee-saved registers are restored. In 64-bit, it's RAX, RCX, RDX, RSI,
- // RDI, R8, R9, R11.
- if (!isa<GlobalAddressSDNode>(Callee) &&
+ // callee-saved registers are restored. These happen to be the same
+ // registers used to pass 'inreg' arguments so watch out for those.
+ if (!Subtarget->is64Bit() &&
+ !isa<GlobalAddressSDNode>(Callee) &&
!isa<ExternalSymbolSDNode>(Callee)) {
- unsigned Limit = Subtarget->is64Bit() ? 8 : 3;
unsigned NumInRegs = 0;
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
- if (VA.isRegLoc()) {
- if (++NumInRegs == Limit)
+ if (!VA.isRegLoc())
+ continue;
+ unsigned Reg = VA.getLocReg();
+ switch (Reg) {
+ default: break;
+ case X86::EAX: case X86::EDX: case X86::ECX:
+ if (++NumInRegs == 3)
return false;
+ break;
}
}
}
--- /dev/null
+; RUN: llc < %s -mtriple=i386-pc-linux-gnu | FileCheck %s
+; pr7610
+
+define cc10 void @t(i32* %Base_Arg, i32* %Sp_Arg, i32* %Hp_Arg, i32 %R1_Arg) nounwind {
+cm1:
+; CHECK: t:
+; CHECK: jmpl *%eax
+ %nm3 = getelementptr i32* %Sp_Arg, i32 1
+ %nm9 = load i32* %Sp_Arg
+ %nma = inttoptr i32 %nm9 to void (i32*, i32*, i32*, i32)*
+ tail call cc10 void %nma(i32* %Base_Arg, i32* %nm3, i32* %Hp_Arg, i32 %R1_Arg) nounwind
+ ret void
+}