Boxis R700 User Manual Page 177

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ATI R700 Technology
ALU Instructions 9-79
Copyright © 2009 Advanced Micro Devices, Inc. All rights reserved.
Scalar Base-2 Log
Instructions
LOG_CLAMPED
Description Scalar base-2 log.
If (src0 == 1.0f) {
dst = 0.0f;
}
Else {
dst = LOG_IEEE(src0)
// clamp dst
if (dst == -INFINITY) {
dst = -MAX_FLOAT;
}
Microcode
Format ALU_DWORD0 (page 10-16) and ALU_DWORD1_OP2 (page 10-18).
Instruction Field ALU_INST == OP2_INST_LOG_CLAMPED, opcode 98 (0x62).
C DE
D
R
DST_GPR BS ALU_INST OMOD
W
M
U
P
U
E
M
S
1
A
S
0
A
+4
L PS IM
S
1
N
S1E
S
1
R
SRC1_SEL
S
0
N
S0E
S
0
R
SRC0_SEL
+0
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