diff --git a/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp b/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
--- a/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp
@@ -1466,11 +1466,10 @@
           .addImm(0)
           .addImm(32 - Log2(MaxAlign))
           .addImm(31);
-    BuildMI(PrologMBB, {MI}, DL, TII.get(isPPC64 ? PPC::STDUX : PPC::STWUX),
+    BuildMI(PrologMBB, {MI}, DL, TII.get(isPPC64 ? PPC::SUBFC8 : PPC::SUBFC),
             SPReg)
-        .addReg(FPReg)
-        .addReg(SPReg)
-        .addReg(ScratchReg);
+        .addReg(ScratchReg)
+        .addReg(SPReg);
   }
   // Probe residual part.
   if (NegResidualSize) {
diff --git a/llvm/test/CodeGen/PowerPC/pr46759.ll b/llvm/test/CodeGen/PowerPC/pr46759.ll
--- a/llvm/test/CodeGen/PowerPC/pr46759.ll
+++ b/llvm/test/CodeGen/PowerPC/pr46759.ll
@@ -12,7 +12,7 @@
 ; CHECK-LE-NEXT:    mr r12, r1
 ; CHECK-LE-NEXT:    .cfi_def_cfa r12, 0
 ; CHECK-LE-NEXT:    clrldi r0, r12, 53
-; CHECK-LE-NEXT:    stdux r12, r1, r0
+; CHECK-LE-NEXT:    subc r1, r1, r0
 ; CHECK-LE-NEXT:    stdu r12, -2048(r1)
 ; CHECK-LE-NEXT:    stdu r12, -4096(r1)
 ; CHECK-LE-NEXT:    .cfi_def_cfa_register r1