diff options
Diffstat (limited to 'src/gallium/auxiliary')
-rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_arit.c | 35 | ||||
-rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_arit.h | 4 |
2 files changed, 39 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c index f60a7a213ac..42ae9f6a22c 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c @@ -718,6 +718,41 @@ lp_build_sgn(struct lp_build_context *bld, /** + * Set the sign of float vector 'a' according to 'sign'. + * If sign==0, return abs(a). + * If sign==1, return -abs(a); + * Other values for sign produce undefined results. + */ +LLVMValueRef +lp_build_set_sign(struct lp_build_context *bld, + LLVMValueRef a, LLVMValueRef sign) +{ + const struct lp_type type = bld->type; + LLVMTypeRef int_vec_type = lp_build_int_vec_type(type); + LLVMTypeRef vec_type = lp_build_vec_type(type); + LLVMValueRef shift = lp_build_int_const_scalar(type, type.width - 1); + LLVMValueRef mask = lp_build_int_const_scalar(type, + ~((unsigned long long) 1 << (type.width - 1))); + LLVMValueRef val, res; + + assert(type.floating); + + /* val = reinterpret_cast<int>(a) */ + val = LLVMBuildBitCast(bld->builder, a, int_vec_type, ""); + /* val = val & mask */ + val = LLVMBuildAnd(bld->builder, val, mask, ""); + /* sign = sign << shift */ + sign = LLVMBuildShl(bld->builder, sign, shift, ""); + /* res = val | sign */ + res = LLVMBuildOr(bld->builder, val, sign, ""); + /* res = reinterpret_cast<float>(res) */ + res = LLVMBuildBitCast(bld->builder, res, vec_type, ""); + + return res; +} + + +/** * Convert vector of int to vector of float. */ LLVMValueRef diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.h b/src/gallium/auxiliary/gallivm/lp_bld_arit.h index 2d19ec06b43..866349d8cba 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_arit.h +++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.h @@ -125,6 +125,10 @@ lp_build_sgn(struct lp_build_context *bld, LLVMValueRef a); LLVMValueRef +lp_build_set_sign(struct lp_build_context *bld, + LLVMValueRef a, LLVMValueRef sign); + +LLVMValueRef lp_build_int_to_float(struct lp_build_context *bld, LLVMValueRef a); |