Put some variables into register.
This could improve luxMark sala about 10% under strict conformance.
Signed-off-by: Ruiling Song <ruiling.s...@intel.com>
---
backend/src/ocl_stdlib.tmpl.h | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/backend/src/ocl_stdlib.tmpl.h b/backend/src/ocl_stdlib.tmpl.h
index c2eca7c..fc6de25 100755
--- a/backend/src/ocl_stdlib.tmpl.h
+++ b/backend/src/ocl_stdlib.tmpl.h
@@ -2648,16 +2648,15 @@ INLINE_OVERLOADABLE float __gen_ocl_internal_exp(float
x) {
P3 = 6.6137559770e-05, /* 0x388ab355 */
P4 = -1.6533901999e-06, /* 0xb5ddea0e */
P5 = 4.1381369442e-08; /* 0x3331bb4c */
- float ln2HI[2],ln2LO[2],halF[2];
float y,hi=0.0,lo=0.0,c,t;
int k=0,xsb;
unsigned hx;
- ln2HI[0] = 6.9313812256e-01; /* 0x3f317180 */
- ln2HI[1] = -6.9313812256e-01; /* 0xbf317180 */
- ln2LO[0] = 9.0580006145e-06; /* 0x3717f7d1 */
- ln2LO[1] = -9.0580006145e-06; /* 0xb717f7d1 */
- halF[0] = 0.5;
- halF[1] = -0.5;
+ float ln2HI_0 = 6.9313812256e-01; /* 0x3f317180 */
+ float ln2HI_1 = -6.9313812256e-01; /* 0xbf317180 */
+ float ln2LO_0 = 9.0580006145e-06; /* 0x3717f7d1 */
+ float ln2LO_1 = -9.0580006145e-06; /* 0xb717f7d1 */
+ float half_0 = 0.5;
+ float half_1 = -0.5;
GEN_OCL_GET_FLOAT_WORD(hx,x);
xsb = (hx>>31)&1; /* sign bit of x */
@@ -2675,12 +2674,13 @@ INLINE_OVERLOADABLE float __gen_ocl_internal_exp(float
x) {
/* argument reduction */
if(hx > 0x3eb17218) { /* if |x| > 0.5 ln2 */
if(hx < 0x3F851592) { /* and |x| < 1.5 ln2 */
- hi = x-ln2HI[xsb]; lo=ln2LO[xsb]; k = 1-xsb-xsb;
+ hi = x-(xsb ==1 ? ln2HI_1 : ln2HI_0); lo= xsb == 1? ln2LO_1 : ln2LO_0; k
= 1-xsb-xsb;
} else {
- k = ivln2*x+halF[xsb];
+ float tmp = xsb == 1 ? half_1 : half_0;
+ k = ivln2*x+tmp;
t = k;
- hi = x - t*ln2HI[0]; /* t*ln2HI is exact here */
- lo = t*ln2LO[0];
+ hi = x - t*ln2HI_0; /* t*ln2HI is exact here */
+ lo = t*ln2LO_0;
}
x = hi - lo;
}
--
1.7.10.4
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