V4: Fix 32bit moveReg to not use the return value registers

As with the 64bit implementation: use the scratch register. The return
value register is used to hold the newly allocated space on the JS
stack.

Fixes: QTBUG-71319
Change-Id: Ia924ad24ff7f4fbf5ec21b6e6237cce7d907bf3e
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/qml/jit/qv4baselineassembler.cpp b/src/qml/jit/qv4baselineassembler.cpp
index f6b745632b..c62d6e5388 100644
--- a/src/qml/jit/qv4baselineassembler.cpp
+++ b/src/qml/jit/qv4baselineassembler.cpp
@@ -444,12 +444,12 @@ public:
 
     void moveReg(Address sourceRegAddress, Address destRegAddress)
     {
-        load32(sourceRegAddress, ReturnValueRegisterValue);
+        load32(sourceRegAddress, ScratchRegister);
+        store32(ScratchRegister, destRegAddress);
         sourceRegAddress.offset += 4;
-        load32(sourceRegAddress, ReturnValueRegisterTag);
-        store32(ReturnValueRegisterValue, destRegAddress);
         destRegAddress.offset += 4;
-        store32(ReturnValueRegisterTag, destRegAddress);
+        load32(sourceRegAddress, ScratchRegister);
+        store32(ScratchRegister, destRegAddress);
     }
 
     void loadString(int stringId)