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Diffstat (limited to 'src/mesa/x86/read_rgba_span_x86.S')
-rw-r--r--src/mesa/x86/read_rgba_span_x86.S11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/mesa/x86/read_rgba_span_x86.S b/src/mesa/x86/read_rgba_span_x86.S
index 7315826b4d..6b8036e5b8 100644
--- a/src/mesa/x86/read_rgba_span_x86.S
+++ b/src/mesa/x86/read_rgba_span_x86.S
@@ -92,7 +92,7 @@ _generic_read_RGBA_span_BGRA8888_REV_MMX:
movl 12(%esp), %ecx /* destination pointer */
testl %edx, %edx
- je .L20 /* Bail if there's nothing to do. */
+ jle .L20 /* Bail if there's nothing to do. */
movl %ebx, %eax
@@ -189,6 +189,9 @@ _generic_read_RGBA_span_BGRA8888_REV_SSE:
movl 24(%esp), %edx /* number of pixels to copy */
movl 20(%esp), %ecx /* destination pointer */
+ testl %edx, %edx
+ jle .L35 /* Bail if there's nothing to do. */
+
movl %esp, %ebp
subl $16, %esp
andl $0xfffffff0, %esp
@@ -348,6 +351,9 @@ _generic_read_RGBA_span_BGRA8888_REV_SSE2:
movl %ebx, %eax
movl %edx, %esi
+ testl %edx, %edx
+ jle .L46 /* Bail if there's nothing to do. */
+
/* If the source pointer isn't a multiple of 16 we have to process
* a few pixels the "slow" way to get the address aligned for
* the SSE fetch intsructions.
@@ -528,7 +534,8 @@ _generic_read_RGBA_span_RGB565_MMX:
movq prescale, %mm6
movq scale, %mm7
- shrl $2, %ecx
+ sarl $2, %ecx
+ jle .L01 /* Bail early if the count is negative. */
jmp .L02
.L03: