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Fix operator% for f32 and vecN<f32>

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https://github.com/gpuweb/gpuweb/pull/1945 changes the SPIR-V mapping of this operator so that it now maps to OpFRem instead of OpFMod. Polyfill OpFMod with `x - y * floor(x / y)`

Also map the MSL output of this operator to use `fmod()`.

Behavior of this operator is now consistent across all backends.

Fixed: tint:945
Fixed: tint:977
Fixed: tint:1010
Change-Id: Iefa009b905989c55ace24e073ab0e261c7cf69b0
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/58393
Auto-Submit: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>
This commit is contained in:
Ben Clayton
2021-07-21 14:11:01 +00:00
committed by Tint LUCI CQ
parent 1ec484410a
commit 81d4ed0d9c
17 changed files with 453 additions and 98 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/reader/spirv/function.cc
View File

@@ -212,7 +212,7 @@ ast::BinaryOp ConvertBinaryOp(SpvOp opcode) {
return ast::BinaryOp::kDivide;
case SpvOpUMod:
case SpvOpSMod:
case SpvOpFMod:
case SpvOpFRem:
return ast::BinaryOp::kModulo;
case SpvOpLogicalEqual:
case SpvOpIEqual:
@@ -398,8 +398,9 @@ std::string GetGlslStd450FuncName(uint32_t ext_opcode) {
return "unpack2x16float";
default:
// TODO(dneto) - The following are not implemented.
// They are grouped semantically, as in GLSL.std.450.h.
// TODO(dneto) - The following are not implemented.
// They are grouped semantically, as in GLSL.std.450.h.
case GLSLstd450SSign:
case GLSLstd450Radians:
@@ -3854,6 +3855,10 @@ TypedExpression FunctionEmitter::MaybeEmitCombinatorialValue(
return MakeIntrinsicCall(inst);
}
if (opcode == SpvOpFMod) {
return MakeFMod(inst);
}
if (opcode == SpvOpAccessChain || opcode == SpvOpInBoundsAccessChain) {
return MakeAccessChain(inst);
}
@@ -4074,6 +4079,21 @@ ast::IdentifierExpression* FunctionEmitter::PrefixSwizzle(uint32_t n) {
return nullptr;
}
TypedExpression FunctionEmitter::MakeFMod(
const spvtools::opt::Instruction& inst) {
auto x = MakeOperand(inst, 0);
auto y = MakeOperand(inst, 1);
if (!x || !y) {
return {};
}
// Emulated with: x - y * floor(x / y)
auto* div = builder_.Div(x.expr, y.expr);
auto* floor = builder_.Call("floor", div);
auto* y_floor = builder_.Mul(y.expr, floor);
auto* res = builder_.Sub(x.expr, y_floor);
return {x.type, res};
}
TypedExpression FunctionEmitter::MakeAccessChain(
const spvtools::opt::Instruction& inst) {
if (inst.NumInOperands() < 1) {

5
src/reader/spirv/function.h
View File

@@ -966,6 +966,11 @@ class FunctionEmitter {
/// @results a copy of the expression, with possibly updated type
TypedExpression InferFunctionStorageClass(TypedExpression expr);
/// Returns an expression for a SPIR-V OpFMod instruction.
/// @param inst the SPIR-V instruction
/// @returns an expression
TypedExpression MakeFMod(const spvtools::opt::Instruction& inst);
/// Returns an expression for a SPIR-V OpAccessChain or OpInBoundsAccessChain
/// instruction.
/// @param inst the SPIR-V instruction

108
src/reader/spirv/function_arithmetic_test.cc
View File

@@ -1239,18 +1239,120 @@ TEST_F(SpvBinaryArithTestBasic, SMod_Vector_UnsignedResult) {
}
INSTANTIATE_TEST_SUITE_P(
SpvParserTest_FMod,
SpvParserTest_FRem,
SpvBinaryArithTest,
::testing::Values(
// Scalar float
BinaryData{"float", "float_50", "OpFMod", "float_60", "__f32",
BinaryData{"float", "float_50", "OpFRem", "float_60", "__f32",
"ScalarConstructor[not set]{50.000000}", "modulo",
"ScalarConstructor[not set]{60.000000}"},
// Vector float
BinaryData{"v2float", "v2float_50_60", "OpFMod", "v2float_60_50",
BinaryData{"v2float", "v2float_50_60", "OpFRem", "v2float_60_50",
"__vec_2__f32", AstFor("v2float_50_60"), "modulo",
AstFor("v2float_60_50")}));
TEST_F(SpvBinaryArithTestBasic, FMod_Scalar) {
const auto assembly = Preamble() + R"(
%100 = OpFunction %void None %voidfn
%entry = OpLabel
%1 = OpFMod %float %float_50 %float_60
OpReturn
OpFunctionEnd
)";
auto p = parser(test::Assemble(assembly));
ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
<< p->error() << "\n"
<< assembly;
auto fe = p->function_emitter(100);
EXPECT_TRUE(fe.EmitBody()) << p->error();
EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(
VariableConst{
x_1
none
undefined
__f32
{
Binary[not set]{
ScalarConstructor[not set]{50.000000}
subtract
Binary[not set]{
ScalarConstructor[not set]{60.000000}
multiply
Call[not set]{
Identifier[not set]{floor}
(
Binary[not set]{
ScalarConstructor[not set]{50.000000}
divide
ScalarConstructor[not set]{60.000000}
}
)
}
}
}
}
})"));
}
TEST_F(SpvBinaryArithTestBasic, FMod_Vector) {
const auto assembly = Preamble() + R"(
%100 = OpFunction %void None %voidfn
%entry = OpLabel
%1 = OpFMod %v2float %v2float_50_60 %v2float_60_50
OpReturn
OpFunctionEnd
)";
auto p = parser(test::Assemble(assembly));
ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
<< p->error() << "\n"
<< assembly;
auto fe = p->function_emitter(100);
EXPECT_TRUE(fe.EmitBody()) << p->error();
EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(
VariableConst{
x_1
none
undefined
__vec_2__f32
{
Binary[not set]{
TypeConstructor[not set]{
__vec_2__f32
ScalarConstructor[not set]{50.000000}
ScalarConstructor[not set]{60.000000}
}
subtract
Binary[not set]{
TypeConstructor[not set]{
__vec_2__f32
ScalarConstructor[not set]{60.000000}
ScalarConstructor[not set]{50.000000}
}
multiply
Call[not set]{
Identifier[not set]{floor}
(
Binary[not set]{
TypeConstructor[not set]{
__vec_2__f32
ScalarConstructor[not set]{50.000000}
ScalarConstructor[not set]{60.000000}
}
divide
TypeConstructor[not set]{
__vec_2__f32
ScalarConstructor[not set]{60.000000}
ScalarConstructor[not set]{50.000000}
}
}
)
}
}
}
}
})"));
}
TEST_F(SpvBinaryArithTestBasic, VectorTimesScalar) {
const auto assembly = Preamble() + R"(
%100 = OpFunction %void None %voidfn