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gallivm: support non-vector float in lp_build_sgn()

This commit is contained in:
Brian Paul 2010-03-12 14:24:03 -07:00
parent f1d6baee0b
commit a6196ce8be
1 changed files with 21 additions and 6 deletions
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27
src/gallium/auxiliary/gallivm/lp_bld_arit.c
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@ -720,12 +720,12 @@ lp_build_negate(struct lp_build_context *bld,
}
/** Return -1, 0 or +1 depending on the sign of a */
LLVMValueRef
lp_build_sgn(struct lp_build_context *bld,
LLVMValueRef a)
{
const struct lp_type type = bld->type;
LLVMTypeRef vec_type = lp_build_vec_type(type);
LLVMValueRef cond;
LLVMValueRef res;
@ -735,14 +735,29 @@ lp_build_sgn(struct lp_build_context *bld,
res = bld->one;
}
else if(type.floating) {
/* Take the sign bit and add it to 1 constant */
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
LLVMValueRef mask = lp_build_int_const_scalar(type, (unsigned long long)1 << (type.width - 1));
LLVMTypeRef vec_type;
LLVMTypeRef int_type;
LLVMValueRef mask;
LLVMValueRef sign;
LLVMValueRef one;
sign = LLVMBuildBitCast(bld->builder, a, int_vec_type, "");
unsigned long long maskBit = (unsigned long long)1 << (type.width - 1);
if (type.length == 1) {
int_type = lp_build_int_elem_type(type);
vec_type = lp_build_elem_type(type);
mask = LLVMConstInt(int_type, maskBit, 0);
}
else {
/* vector */
int_type = lp_build_int_vec_type(type);
vec_type = lp_build_vec_type(type);
mask = lp_build_int_const_scalar(type, maskBit);
}
/* Take the sign bit and add it to 1 constant */
sign = LLVMBuildBitCast(bld->builder, a, int_type, "");
sign = LLVMBuildAnd(bld->builder, sign, mask, "");
one = LLVMConstBitCast(bld->one, int_vec_type);
one = LLVMConstBitCast(bld->one, int_type);
res = LLVMBuildOr(bld->builder, sign, one, "");
res = LLVMBuildBitCast(bld->builder, res, vec_type, "");
}