Refactoring: shifting to avoid stack hit

2024-12-23 11:31:41 +00:00 · 2014-06-07 13:40:18 -07:00 · 2014-06-07 13:40:18 -07:00 · 30cf264aa6
commit 30cf264aa6
parent 05e10b7eb8
1 changed files with 2 additions and 2 deletions
--- a/src/x86/cpu.S
+++ b/src/x86/cpu.S
@ -82,7 +82,7 @@

 #define BranchXCycles \
                incb    DebugCycleCount; /* +1 branch taken */ \
-                pushl   %ebx; \
+                shll    $16, %ebx; \
                movw    PC_Reg, %bx; \
                cbw; \
                addw    %bx, %ax; \
@ -90,7 +90,7 @@
                cmpb    %ah, %bh; \
                je      9f; \
                incb    DebugCycleCount; /* +1 branch new page */ \
-9:              popl    %ebx;
+9:              shrl    $16, %ebx;

 #define FlagC   lahf; \
                andb    $C_Flag, %ah; \