CPUEquivalence: Add PPSSPP_CPUFUZZ_ACCURATE_VDOT

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/cpu-equivalence.md

@@ -33,6 +33,7 @@ Environment variables:
 | `PPSSPP_CPUFUZZ_DUMP` | write every core's end state of every case to a file |
 | `PPSSPP_CPUFUZZ_STRICT` | fail on any difference, not only on a crash |
 | `PPSSPP_CPUFUZZ_OPS` | comma-separated instruction name prefixes to generate only; `dot` is the dot products and the prefix ops |
+| `PPSSPP_CPUFUZZ_ACCURATE_VDOT` | run with the accurate dot products |
 
 For quick rounds while working on some instructions, fuzz just those, on every core of the machine:
 `PPSSPP_CPUFUZZ_OPS=dot Tools/cpu_fuzz_parallel.py build/PPSSPPUnitTest --count 2000` splits the seeds

unittest/JitHarness.cpp

@@ -398,6 +398,7 @@ bool TestJitReplacementHooks() {
 //   PPSSPP_CPUFUZZ_SKIP     cores not to run, by digit: 1 IR interpreter, 2 JIT, 3 JIT IR.
 //   PPSSPP_CPUFUZZ_REPORTS  how many differences to minimize and print (default 20).
 //   PPSSPP_CPUFUZZ_STRICT   fail the test on any difference, not only on a crash.
+//   PPSSPP_CPUFUZZ_ACCURATE_VDOT  run with AccurateVdot, the VFPU's own dot products.
 //   PPSSPP_CPUFUZZ_OPS      comma-separated instruction name prefixes to generate only, for fast
 //                           runs on the instructions being worked on. "dot" is the dot products
 //                           and the prefixes. Without PPSSPP_CPUFUZZ_CLASSES, the class is "v".
@@ -899,6 +900,8 @@ bool TestCPUEquivalence() {
 	// terminating syscall doesn't.
 	const bool oldSkipDeadbeef = g_Config.bSkipDeadbeefFilling;
 	g_Config.bSkipDeadbeefFilling = true;
+	const bool oldAccurateVdot = g_Config.bAccurateVdot;
+	g_Config.bAccurateVdot = getenv("PPSSPP_CPUFUZZ_ACCURATE_VDOT") != nullptr;
 
 	const char *countStr = getenv("PPSSPP_CPUFUZZ_COUNT");
 	const char *seedStr = getenv("PPSSPP_CPUFUZZ_SEED");
@@ -1049,6 +1052,7 @@ bool TestCPUEquivalence() {
 	mipsr4k.UpdateCore(CPUCore::INTERPRETER);
 	DestroyJitHarness();
 	g_Config.bSkipDeadbeefFilling = oldSkipDeadbeef;
+	g_Config.bAccurateVdot = oldAccurateVdot;
 	return success;
 }