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gallivm: Add support for unorm16 in lp_build_mul.

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Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
This commit is contained in:
James Benton
2012-05-30 14:36:22 +01:00
committed by José Fonseca
parent c3a465ae98
commit cd548836a1
1 changed files with 45 additions and 0 deletions
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src/gallium/auxiliary/gallivm/lp_bld_arit.c
+45
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@@ -691,6 +691,35 @@ lp_build_mul_u8n(struct gallivm_state *gallivm,
return ab;
}
/**
* Normalized 16bit multiplication.
*
* Utilises same principle as above code.
*/
static LLVMValueRef
lp_build_mul_u16n(struct gallivm_state *gallivm,
struct lp_type i32_type,
LLVMValueRef a, LLVMValueRef b)
{
LLVMBuilderRef builder = gallivm->builder;
LLVMValueRef c16;
LLVMValueRef ab;
assert(!i32_type.floating);
assert(lp_check_value(i32_type, a));
assert(lp_check_value(i32_type, b));
c16 = lp_build_const_int_vec(gallivm, i32_type, 16);
/* ab/65535 ~= (ab + (ab >> 16) + 0x8000) >> 16 */
ab = LLVMBuildMul(builder, a, b, "");
ab = LLVMBuildAdd(builder, ab, LLVMBuildLShr(builder, ab, c16, ""), "");
ab = LLVMBuildAdd(builder, ab, lp_build_const_int_vec(gallivm, i32_type, 0x8000), "");
ab = LLVMBuildLShr(builder, ab, c16, "");
return ab;
}
/**
* Generate a * b
@@ -736,6 +765,22 @@ lp_build_mul(struct lp_build_context *bld,
return ab;
}
if(type.width == 16) {
struct lp_type i32_type = lp_wider_type(type);
LLVMValueRef al, ah, bl, bh, abl, abh, ab;
lp_build_unpack2(bld->gallivm, type, i32_type, a, &al, &ah);
lp_build_unpack2(bld->gallivm, type, i32_type, b, &bl, &bh);
/* PMULLW, PSRLW, PADDW */
abl = lp_build_mul_u16n(bld->gallivm, i32_type, al, bl);
abh = lp_build_mul_u16n(bld->gallivm, i32_type, ah, bh);
ab = lp_build_pack2(bld->gallivm, i32_type, type, abl, abh);
return ab;
}
/* FIXME */
assert(0);
}