[libclc] r330206 - pown: Use denormal path only
Jan Vesely via cfe-commits
cfe-commits at lists.llvm.org
Tue Apr 17 12:35:30 PDT 2018
Author: jvesely
Date: Tue Apr 17 12:35:30 2018
New Revision: 330206
URL: http://llvm.org/viewvc/llvm-project?rev=330206&view=rev
Log:
pown: Use denormal path only
It's OK to either flush to 0 or return denormal result if the device
does not support denormals. See sec 7.2 and 7.5.3 of OCL specs
Fixes CTS on carrizo and turks.
Signed-off-by: Jan Vesely <jan.vesely at rutgers.edu>
Reviewer: Aaron Watry <awatry at gmail.com>
Modified:
libclc/trunk/generic/lib/math/clc_pown.cl
Modified: libclc/trunk/generic/lib/math/clc_pown.cl
URL: http://llvm.org/viewvc/llvm-project/libclc/trunk/generic/lib/math/clc_pown.cl?rev=330206&r1=330205&r2=330206&view=diff
==============================================================================
--- libclc/trunk/generic/lib/math/clc_pown.cl (original)
+++ libclc/trunk/generic/lib/math/clc_pown.cl Tue Apr 17 12:35:30 2018
@@ -167,17 +167,7 @@ _CLC_DEF _CLC_OVERLOAD float __clc_pown(
tv = USE_TABLE(exp_tbl_ep, j);
float expylogx = mad(tv.s0, poly, mad(tv.s1, poly, tv.s1)) + tv.s0;
- float sexpylogx;
- if (!__clc_fp32_subnormals_supported()) {
- int explg = ((as_uint(expylogx) & EXPBITS_SP32 >> 23) - 127);
- m = (23-(m + 149)) == 0 ? 1: m;
- uint mantissa = ((as_uint(expylogx) & MANTBITS_SP32)|IMPBIT_SP32) >> (23-(m + 149));
- sexpylogx = as_float(mantissa);
- } else {
- sexpylogx = expylogx * as_float(0x1 << (m + 149));
- }
-
-
+ float sexpylogx = expylogx * as_float(0x1 << (m + 149));
float texpylogx = as_float(as_int(expylogx) + m2);
expylogx = m < -125 ? sexpylogx : texpylogx;
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