8363858: [perf] OptimizeFill may use wide set of intrinsics

Vladimir Ivanov · Sandhya Viswanathan · commit 1dc1d56f79e1 · 2025-09-04T16:57:36.000Z
Reviewed-by: roland, sviswanathan
diff --git a/src/hotspot/cpu/x86/vm_version_x86.cpp b/src/hotspot/cpu/x86/vm_version_x86.cpp
@@ -1665,7 +1665,7 @@ void VM_Version::get_processor_features() {
 
 #ifdef COMPILER2
   if (FLAG_IS_DEFAULT(OptimizeFill)) {
-    if (MaxVectorSize < 32 || !VM_Version::supports_avx512vlbw()) {
+    if (MaxVectorSize < 32 || (!EnableX86ECoreOpts && !VM_Version::supports_avx512vlbw())) {
       OptimizeFill = false;
     }
   }

Original file line number	Diff line number	Diff line change
`@@ -1665,7 +1665,7 @@ void VM_Version::get_processor_features() {`
`1665`	`1665`
`1666`	`1666`	`#ifdef COMPILER2`
`1667`	`1667`	`if (FLAG_IS_DEFAULT(OptimizeFill)) {`
`1668`		`- if (MaxVectorSize < 32 \|\| !VM_Version::supports_avx512vlbw()) {`
	`1668`	`+ if (MaxVectorSize < 32 \|\| (!EnableX86ECoreOpts && !VM_Version::supports_avx512vlbw())) {`
`1669`	`1669`	`OptimizeFill = false;`
`1670`	`1670`	`}`
`1671`	`1671`	`}`