[ARM64_DYNAREC] Improved a bit MULX opcode

ptitSeb · Jan 1, 2025 · 0893038 · 0893038
1 parent 495c98a
commit 0893038
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Showing 2 changed files with 14 additions and 8 deletions.
diff --git a/src/dynarec/arm64/dynarec_arm64_67_avx.c b/src/dynarec/arm64/dynarec_arm64_67_avx.c
@@ -85,15 +85,21 @@ uintptr_t dynarec64_67_AVX(dynarec_arm_t* dyn, uintptr_t addr, uintptr_t ip, int
                 GETGD;
                 GETED32(0);
                 GETVD;
-                if(rex.w) {
-                    // 64bits mul
-                    UMULH(x3, xRDX, ed);
-                    MULx(vd, xRDX, ed);
-                    MOVx_REG(gd, x3);
+                    if(rex.w) {
+                        // 64bits mul
+                    if((gd==xRDX) || (gd==ed) || (gd==vd))
+                        gb1 = x3;
+                    else
+                        gb1 = gd;
+                    UMULH(gb1, xRDX, ed);
+                    if(gd!=vd) {MULx(vd, xRDX, ed);}
+                    if(gb1==x3) {
+                        MOVx_REG(gd, gb1);
+                    }
                 } else {
                     // 32bits mul
                     UMULL(x3, xRDX, ed);
-                    MOVw_REG(vd, x3);
+                    if(gd!=vd) {MOVw_REG(vd, x3);}
                     LSRx(gd, x3, 32);
                 }
                 break;

diff --git a/src/dynarec/arm64/dynarec_arm64_avx_f2_0f38.c b/src/dynarec/arm64/dynarec_arm64_avx_f2_0f38.c
@@ -74,14 +74,14 @@ uintptr_t dynarec64_AVX_F2_0F38(dynarec_arm_t* dyn, uintptr_t addr, uintptr_t ip
                 else
                     gb1 = gd;
                 UMULH(gb1, xRDX, ed);
-                MULx(vd, xRDX, ed);
+                if(gd!=vd) {MULx(vd, xRDX, ed);}
                 if(gb1==x3) {
                     MOVx_REG(gd, gb1);
                 }
             } else {
                 // 32bits mul
                 UMULL(x3, xRDX, ed);
-                MOVw_REG(vd, x3);
+                if(gd!=vd) {MOVw_REG(vd, x3);}
                 LSRx(gd, x3, 32);
             }
             break;