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vtn,rusticl: support fma terribly

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Libclc from llvm-23 seems to require SPV_KHR_fma

And because it's a lot of work to support it properly, support it in a
terrible way for now so that things at least load...
This commit is contained in:
Karol Herbst 2026-04-01 03:04:03 +02:00 • committed by Karol Herbst
parent 5b76c1dd0c
commit 2c276a25aa
3 changed files with 12 additions and 0 deletions
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2
src/compiler/spirv/spirv_to_nir.c
View file

@ -79,6 +79,7 @@ static const struct spirv_capabilities implemented_capabilities = {
.Float16Buffer = true,
.Float64 = true,
.FloatControls2 = true,
.FMAKHR = true,
.FragmentBarycentricKHR = true,
.FragmentDensityEXT = true,
.FragmentFullyCoveredEXT = true,
@ -6846,6 +6847,7 @@ vtn_handle_body_instruction(struct vtn_builder *b, SpvOp opcode,
case SpvOpFSub:
case SpvOpIMul:
case SpvOpFMul:
case SpvOpFmaKHR:
case SpvOpUDiv:
case SpvOpSDiv:
case SpvOpFDiv:

8
src/compiler/spirv/vtn_alu.c
View file

@ -807,6 +807,14 @@ vtn_handle_alu(struct vtn_builder *b, SpvOp opcode,
nir_fdot(&b->nb, src[0], src[1]);
break;
case SpvOpFmaKHR:
const unsigned save_fp_math_ctrl = b->nb.fp_math_ctrl;
b->nb.fp_math_ctrl |= nir_fp_exact;
dest->def = nir_ffma(&b->nb, src[0], src[1], src[2]);
b->nb.fp_math_ctrl = save_fp_math_ctrl;
break;
case SpvOpIAddCarry:
vtn_assert(glsl_type_is_struct_or_ifc(dest_type));
dest->elems[0]->def = nir_iadd(&b->nb, src[0], src[1]);

2
src/gallium/frontends/rusticl/core/device.rs
View file

@ -637,6 +637,7 @@ impl DeviceBase {
add_spirv(c"SPV_KHR_bit_instructions");
add_spirv(c"SPV_KHR_expect_assume");
add_spirv(c"SPV_KHR_float_controls");
add_spirv(c"SPV_KHR_fma");
add_spirv(c"SPV_KHR_integer_dot_product");
add_spirv(c"SPV_KHR_no_integer_wrap_decoration");
@ -647,6 +648,7 @@ impl DeviceBase {
add_cap(SpvCapability::SpvCapabilityDotProductInput4x8BitPacked);
add_cap(SpvCapability::SpvCapabilityExpectAssumeKHR);
add_cap(SpvCapability::SpvCapabilityFloat16Buffer);
add_cap(SpvCapability::SpvCapabilityFMAKHR);
add_cap(SpvCapability::SpvCapabilityInt8);
add_cap(SpvCapability::SpvCapabilityInt16);
add_cap(SpvCapability::SpvCapabilityLinkage);