encounter
/
dawn-cmake
mirror of https://github.com/encounter/dawn-cmake.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[spirv-writer] Avoid branch after dead if/then if/else 

Bug: tint:64
Change-Id: I008c449ca634c6410055a65927199fda2d7bbb06
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/20720
Reviewed-by: dan sinclair <dsinclair@google.com>
This commit is contained in:
David Neto 2020-04-30 01:17:46 +00:00 committed by dan sinclair
parent 9684d8101d
commit a1a4800861
2 changed files with 312 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/writer/spirv/builder.cc
View File

@ -94,6 +94,8 @@ bool LastIsTerminator(const ast::StatementList& stmts) {
}
auto* last = stmts.back().get();
// TODO(dneto): Conditional break and conditional continue should return
// false.
return last->IsBreak() || last->IsContinue() || last->IsReturn() ||
last->IsKill() || last->IsFallthrough();
}
@ -1027,9 +1029,10 @@ bool Builder::GenerateConditionalBlock(
if (!GenerateStatementList(true_body)) {
return false;
}
// TODO(dsinclair): The branch should be optional based on how the
// StatementList ended ...
push_function_inst(spv::Op::OpBranch, {Operand::Int(merge_block_id)});
// We only branch if the last element of the body didn't already branch.
if (!LastIsTerminator(true_body)) {
push_function_inst(spv::Op::OpBranch, {Operand::Int(merge_block_id)});
}
// Start the false block if needed
if (false_block_id != merge_block_id) {
@ -1041,14 +1044,13 @@ bool Builder::GenerateConditionalBlock(
if (!GenerateStatementList(else_stmt->body())) {
return false;
}
// TODO(dsinclair): The branch should be optional based on how the
// StatementList ended ...
push_function_inst(spv::Op::OpBranch, {Operand::Int(merge_block_id)});
} else {
if (!GenerateConditionalBlock(else_stmt->condition(), else_stmt->body(),
cur_else_idx + 1, else_stmts)) {
return false;
}
}
if (!LastIsTerminator(else_stmt->body())) {
push_function_inst(spv::Op::OpBranch, {Operand::Int(merge_block_id)});
}
}

312
src/writer/spirv/builder_if_test.cc
View File

@ -17,11 +17,16 @@
#include "gtest/gtest.h"
#include "src/ast/assignment_statement.h"
#include "src/ast/bool_literal.h"
#include "src/ast/break_statement.h"
#include "src/ast/continue_statement.h"
#include "src/ast/else_statement.h"
#include "src/ast/identifier_expression.h"
#include "src/ast/if_statement.h"
#include "src/ast/int_literal.h"
#include "src/ast/loop_statement.h"
#include "src/ast/return_statement.h"
#include "src/ast/scalar_constructor_expression.h"
#include "src/ast/statement_condition.h"
#include "src/ast/type/bool_type.h"
#include "src/ast/type/i32_type.h"
#include "src/context.h"
@ -367,22 +372,313 @@ OpBranch %6
)");
}
TEST_F(BuilderTest, DISABLED_If_WithBreak) {
// if (a) {
// break;
TEST_F(BuilderTest, If_WithBreak) {
ast::type::BoolType bool_type;
// loop {
// if (true) {
// break;
// }
// }
auto cond = std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::BoolLiteral>(&bool_type, true));
ast::StatementList if_body;
if_body.push_back(std::make_unique<ast::BreakStatement>());
auto if_stmt =
std::make_unique<ast::IfStatement>(std::move(cond), std::move(if_body));
ast::StatementList loop_body;
loop_body.push_back(std::move(if_stmt));
ast::LoopStatement expr(std::move(loop_body), {});
Context ctx;
ast::Module mod;
TypeDeterminer td(&ctx, &mod);
ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
Builder b(&mod);
b.push_function(Function{});
EXPECT_TRUE(b.GenerateLoopStatement(&expr)) << b.error();
EXPECT_EQ(DumpInstructions(b.types()), R"(%5 = OpTypeBool
%6 = OpConstantTrue %5
)");
EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
R"(OpBranch %1
%1 = OpLabel
OpLoopMerge %2 %3 None
OpBranch %4
%4 = OpLabel
OpSelectionMerge %7 None
OpBranchConditional %6 %8 %7
%8 = OpLabel
OpBranch %2
%7 = OpLabel
OpBranch %3
%3 = OpLabel
OpBranch %1
%2 = OpLabel
)");
}
TEST_F(BuilderTest, DISABLED_If_WithContinue) {
// if (a) {
// continue;
TEST_F(BuilderTest, If_WithElseBreak) {
ast::type::BoolType bool_type;
// loop {
// if (true) {
// } else {
// break;
// }
// }
auto cond = std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::BoolLiteral>(&bool_type, true));
ast::StatementList if_body;
ast::StatementList else_body;
else_body.push_back(std::make_unique<ast::BreakStatement>());
ast::ElseStatementList else_stmts;
else_stmts.push_back(
std::make_unique<ast::ElseStatement>(std::move(else_body)));
auto if_stmt =
std::make_unique<ast::IfStatement>(std::move(cond), std::move(if_body));
if_stmt->set_else_statements(std::move(else_stmts));
ast::StatementList loop_body;
loop_body.push_back(std::move(if_stmt));
ast::LoopStatement expr(std::move(loop_body), {});
Context ctx;
ast::Module mod;
TypeDeterminer td(&ctx, &mod);
ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
Builder b(&mod);
b.push_function(Function{});
EXPECT_TRUE(b.GenerateLoopStatement(&expr)) << b.error();
EXPECT_EQ(DumpInstructions(b.types()), R"(%5 = OpTypeBool
%6 = OpConstantTrue %5
)");
EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
R"(OpBranch %1
%1 = OpLabel
OpLoopMerge %2 %3 None
OpBranch %4
%4 = OpLabel
OpSelectionMerge %7 None
OpBranchConditional %6 %8 %9
%8 = OpLabel
OpBranch %7
%9 = OpLabel
OpBranch %2
%7 = OpLabel
OpBranch %3
%3 = OpLabel
OpBranch %1
%2 = OpLabel
)");
}
TEST_F(BuilderTest, DISABLED_IF_WithReturn) {
// if (a) {
// This is blocked on implementing conditional break
TEST_F(BuilderTest, DISABLED_If_WithConditionalBreak) {
ast::type::BoolType bool_type;
// loop {
// if (true) {
// break if (false);
// }
// }
auto cond_true = std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::BoolLiteral>(&bool_type, true));
auto cond_false = std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::BoolLiteral>(&bool_type, false));
ast::StatementList if_body;
if_body.push_back(std::make_unique<ast::BreakStatement>(
ast::StatementCondition::kIf, std::move(cond_false)));
auto if_stmt = std::make_unique<ast::IfStatement>(std::move(cond_true),
std::move(if_body));
ast::StatementList loop_body;
loop_body.push_back(std::move(if_stmt));
ast::LoopStatement expr(std::move(loop_body), {});
Context ctx;
ast::Module mod;
TypeDeterminer td(&ctx, &mod);
ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
Builder b(&mod);
b.push_function(Function{});
EXPECT_TRUE(b.GenerateLoopStatement(&expr)) << b.error();
EXPECT_EQ(DumpInstructions(b.types()), R"(%5 = OpTypeBool
%6 = OpConstantTrue %5
%7 = OpConstantFalse %5
)");
EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
R"(OpBranch %1
%1 = OpLabel
OpLoopMerge %2 %3 None
OpBranch %4
%4 = OpLabel
OpSelectionMerge %8 None
OpBranchConditional %6 %9 %8
%9 = OpLabel
OpBranchConditional %7 %2 %8
%8 = OpLabel
OpBranch %3
%3 = OpLabel
OpBranch %1
%2 = OpLabel
)");
}
TEST_F(BuilderTest, DISABLED_If_WithElseConditionalBreak) {
FAIL();
}
TEST_F(BuilderTest, If_WithContinue) {
ast::type::BoolType bool_type;
// loop {
// if (true) {
// continue;
// }
// }
auto cond = std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::BoolLiteral>(&bool_type, true));
ast::StatementList if_body;
if_body.push_back(std::make_unique<ast::ContinueStatement>());
auto if_stmt =
std::make_unique<ast::IfStatement>(std::move(cond), std::move(if_body));
ast::StatementList loop_body;
loop_body.push_back(std::move(if_stmt));
ast::LoopStatement expr(std::move(loop_body), {});
Context ctx;
ast::Module mod;
TypeDeterminer td(&ctx, &mod);
ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
Builder b(&mod);
b.push_function(Function{});
EXPECT_TRUE(b.GenerateLoopStatement(&expr)) << b.error();
EXPECT_EQ(DumpInstructions(b.types()), R"(%5 = OpTypeBool
%6 = OpConstantTrue %5
)");
EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
R"(OpBranch %1
%1 = OpLabel
OpLoopMerge %2 %3 None
OpBranch %4
%4 = OpLabel
OpSelectionMerge %7 None
OpBranchConditional %6 %8 %7
%8 = OpLabel
OpBranch %3
%7 = OpLabel
OpBranch %3
%3 = OpLabel
OpBranch %1
%2 = OpLabel
)");
}
TEST_F(BuilderTest, DISABLED_If_WithConditionalContinue) {
FAIL();
}
TEST_F(BuilderTest, DISABLED_If_WithElseContinue) {
FAIL();
}
TEST_F(BuilderTest, DISABLED_If_WithElseConditionalContinue) {
FAIL();
}
TEST_F(BuilderTest, If_WithReturn) {
ast::type::BoolType bool_type;
// if (true) {
// return;
// }
auto cond = std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::BoolLiteral>(&bool_type, true));
ast::StatementList if_body;
if_body.push_back(std::make_unique<ast::ReturnStatement>());
ast::IfStatement expr(std::move(cond), std::move(if_body));
Context ctx;
ast::Module mod;
TypeDeterminer td(&ctx, &mod);
ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
Builder b(&mod);
b.push_function(Function{});
EXPECT_TRUE(b.GenerateIfStatement(&expr)) << b.error();
EXPECT_EQ(DumpInstructions(b.types()), R"(%1 = OpTypeBool
%2 = OpConstantTrue %1
)");
EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
R"(OpSelectionMerge %3 None
OpBranchConditional %2 %4 %3
%4 = OpLabel
OpReturn
%3 = OpLabel
)");
}
TEST_F(BuilderTest, If_WithReturnValue) {
ast::type::BoolType bool_type;
// if (true) {
// return false;
// }
auto cond = std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::BoolLiteral>(&bool_type, true));
auto cond2 = std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::BoolLiteral>(&bool_type, false));
ast::StatementList if_body;
if_body.push_back(std::make_unique<ast::ReturnStatement>(std::move(cond2)));
ast::IfStatement expr(std::move(cond), std::move(if_body));
Context ctx;
ast::Module mod;
TypeDeterminer td(&ctx, &mod);
ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
Builder b(&mod);
b.push_function(Function{});
EXPECT_TRUE(b.GenerateIfStatement(&expr)) << b.error();
EXPECT_EQ(DumpInstructions(b.types()), R"(%1 = OpTypeBool
%2 = OpConstantTrue %1
%5 = OpConstantFalse %1
)");
EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
R"(OpSelectionMerge %3 None
OpBranchConditional %2 %4 %3
%4 = OpLabel
OpReturnValue %5
%3 = OpLabel
)");
}
} // namespace