From f414a43632988b1a8d8f294a3876ad68154569ba Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <sezeroz@gmail.com>
Date: Mon, 4 Jan 2021 03:00:10 +0300
Subject: [PATCH] simplify Watcom implementation of
SDL_MostSignificantBitIndex32()
---
include/SDL_bits.h | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/include/SDL_bits.h b/include/SDL_bits.h
index f073abeb2..08b59eae3 100644
--- a/include/SDL_bits.h
+++ b/include/SDL_bits.h
@@ -48,10 +48,9 @@ extern "C" {
* \return Index of the most significant bit, or -1 if the value is 0.
*/
#if defined(__WATCOMC__) && defined(__386__)
-extern _inline int _SDL_clz_watcom (Uint32);
-#pragma aux _SDL_clz_watcom = \
+extern _inline int _SDL_bsr_watcom (Uint32);
+#pragma aux _SDL_bsr_watcom = \
"bsr eax, eax" \
- "xor eax, 31" \
parm [eax] nomemory \
value [eax] \
modify exact [eax] nomemory;
@@ -72,7 +71,7 @@ SDL_MostSignificantBitIndex32(Uint32 x)
if (x == 0) {
return -1;
}
- return 31 - _SDL_clz_watcom(x);
+ return _SDL_bsr_watcom(x);
#elif defined(_MSC_VER)
unsigned long index;
if (_BitScanReverse(&index, x)) {