Changeset 103838 in vbox for trunk/src/VBox/VMM/include/IEMN8veRecompiler.h

Timestamp:

Mar 13, 2024 8:06:55 PM (13 months ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

162208

Message:

VMM/IEM: Emit the IEM_MC_MAYBE_RAISE_DEVICE_NOT_AVAILABLE()/IEM_MC_MAYBE_RAISE_SSE_RELATED_XCPT()/IEM_MC_MAYBE_RAISE_AVX_RELATED_XCPT() checks only once per TB or after a helper was called which could modify cr0/cr4/xcr0. Most of the time the check can be omitted for SIMD code, bugref:10614

File:

• trunk/src/VBox/VMM/include/IEMN8veRecompiler.h (modified) (2 diffs)

trunk/src/VBox/VMM/include/IEMN8veRecompiler.h

@@ -1206 +1206 @@
 # define IEMNATIVE_SIMD_REG_STATE_SET_DIRTY_HI_U128(a_pReNative, a_iSimdReg) \
     ((a_pReNative)->Core.bmGstSimdRegShadowDirtyHi128 |= RT_BIT_64(a_iSimdReg))
+
+/** Flag for indicating that IEM_MC_MAYBE_RAISE_DEVICE_NOT_AVAILABLE() has emitted code in the current TB. */
+# define IEMNATIVE_SIMD_RAISE_XCPT_CHECKS_EMITTED_MAYBE_DEVICE_NOT_AVAILABLE RT_BIT_32(0)
+/** Flag for indicating that IEM_MC_MAYBE_RAISE_SSE_RELATED_XCPT() has emitted code in the current TB. */
+# define IEMNATIVE_SIMD_RAISE_XCPT_CHECKS_EMITTED_MAYBE_SSE                  RT_BIT_32(1)
+/** Flag for indicating that IEM_MC_MAYBE_RAISE_AVX_RELATED_XCPT() has emitted code in the current TB. */
+# define IEMNATIVE_SIMD_RAISE_XCPT_CHECKS_EMITTED_MAYBE_AVX                  RT_BIT_32(2)
 #endif
 
@@ -1306 +1313 @@
     /** The expected IEMCPU::fExec value for the current call/instruction. */
     uint32_t                    fExec;
+#ifdef IEMNATIVE_WITH_SIMD_REG_ALLOCATOR
+    /** IEMNATIVE_SIMD_RAISE_XCPT_CHECKS_EMITTED_XXX flags for exception flags
+     * we only emit once per TB (or when the cr0/cr4/xcr0 register changes).
+     *
+     * This is an optimization because these control registers can only be changed from
+     * by calling a C helper we can catch. Should reduce the number of instructions in a TB
+     * consisting of multiple SIMD instructions.
+     */
+    uint32_t                    fSimdRaiseXcptChecksEmitted;
+#endif
 
     /** Core state requiring care with branches. */