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powr: 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@rutgers.edu>
Reviewer: Aaron Watry <awatry@gmail.com>

llvm-svn: 330207
This commit is contained in:
Jan Vesely 2018-04-17 19:35:32 +00:00
parent 4388d2883c
commit 96591b6202
1 changed files with 1 additions and 11 deletions
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12
libclc/generic/lib/math/clc_powr.cl
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@ -165,17 +165,7 @@ _CLC_DEF _CLC_OVERLOAD float __clc_powr(float x, float y)
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;