Merge pull request #24346 from Deigue/z-disable-transform-setmem

r30shah · web-flow · commit 2c7020fad989 · 2026-07-10T15:31:53.000-04:00
Disable transform Unsafe.setMemory by default on Z
diff --git a/runtime/compiler/z/codegen/J9CodeGenerator.cpp b/runtime/compiler/z/codegen/J9CodeGenerator.cpp
@@ -3460,7 +3460,7 @@ bool J9::Z::CodeGenerator::canUseRelativeLongInstructions(int64_t value)
 
 bool J9::Z::CodeGenerator::canTransformUnsafeSetMemory()
 {
-    static bool enableUnsafeSetMemoryAcceleration = (feGetEnv("TR_DisableUnsafeSetMemoryAcceleration") == NULL);
+    static bool enableUnsafeSetMemoryAcceleration = (feGetEnv("TR_EnableUnsafeSetMemoryAcceleration") != NULL);
     return (enableUnsafeSetMemoryAcceleration && self()->comp()->target().is64Bit());
 }
 

Original file line number	Diff line number	Diff line change
`@@ -3460,7 +3460,7 @@ bool J9::Z::CodeGenerator::canUseRelativeLongInstructions(int64_t value)`
`3460`	`3460`
`3461`	`3461`	`bool J9::Z::CodeGenerator::canTransformUnsafeSetMemory()`
`3462`	`3462`	`{`
`3463`		`- static bool enableUnsafeSetMemoryAcceleration = (feGetEnv("TR_DisableUnsafeSetMemoryAcceleration") == NULL);`
	`3463`	`+ static bool enableUnsafeSetMemoryAcceleration = (feGetEnv("TR_EnableUnsafeSetMemoryAcceleration") != NULL);`
`3464`	`3464`	`return (enableUnsafeSetMemoryAcceleration && self()->comp()->target().is64Bit());`
`3465`	`3465`	`}`
`3466`	`3466`