[PowerPC] fix passing long double arguments to function (soft-float)
This patch fixes passing long double type arguments to function in
soft float mode. If there is less than 4 argument registers free
(long double type is mapped in 4 gpr registers in soft float mode)
long double type argument must be passed through stack.
Differential Revision: https://reviews.llvm.org/D20114.
llvm-svn: 277804
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 472db99..2ccbcd9 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -2676,6 +2676,32 @@
return false;
}
+bool
+llvm::CC_PPC32_SVR4_Custom_SkipLastArgRegsPPCF128(unsigned &ValNo, MVT &ValVT,
+ MVT &LocVT,
+ CCValAssign::LocInfo &LocInfo,
+ ISD::ArgFlagsTy &ArgFlags,
+ CCState &State) {
+ static const MCPhysReg ArgRegs[] = {
+ PPC::R3, PPC::R4, PPC::R5, PPC::R6,
+ PPC::R7, PPC::R8, PPC::R9, PPC::R10,
+ };
+ const unsigned NumArgRegs = array_lengthof(ArgRegs);
+
+ unsigned RegNum = State.getFirstUnallocated(ArgRegs);
+ int RegsLeft = NumArgRegs - RegNum;
+
+ // Skip if there is not enough registers left for long double type (4 gpr regs
+ // in soft float mode) and put long double argument on the stack.
+ if (RegNum != NumArgRegs && RegsLeft < 4) {
+ for (int i = 0; i < RegsLeft; i++) {
+ State.AllocateReg(ArgRegs[RegNum + i]);
+ }
+ }
+
+ return false;
+}
+
bool llvm::CC_PPC32_SVR4_Custom_AlignFPArgRegs(unsigned &ValNo, MVT &ValVT,
MVT &LocVT,
CCValAssign::LocInfo &LocInfo,