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dffa60ca98
The continuing block can exit the loop in very constrained ways:
When a break statement is placed such that it would exit from a loop’s
§ 7.3.8 Continuing Statement, then:
- The break statement must appear as either:
- The only statement in the if clause of an if statement that has:
- no else clause or an empty else clause
- no elseif clauses
- The only statement in the else clause of an if statement that has an
empty if clause and no elseif clauses.
- That if statement must appear last in the continuing clause.
By design, this allows a lossless round-trip from SPIR-V to WGSL and
back to SPIR-V. But that requires this special case construct in WGSL
to be translated to an OpBranchConditional with one target being
the loop's megre block (which is where 'break' branches to), and the
other targets the loop header (which is the loop backedge). That
OpBranchConditional takes the place of the normal case of an
unconditional backedge.
Avoids errors like this:
continue construct with the continue target X is not
post dominated by the back-edge block Y
Fixed: 1034
Change-Id: If472a179380b8d77af746a3cd8e279c8a5e56b37
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/59800
Auto-Submit: David Neto <dneto@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: David Neto <dneto@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
93 lines
3.6 KiB
Plaintext
93 lines
3.6 KiB
Plaintext
; SPIR-V
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; Version: 1.3
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; Generator: Google Tint Compiler; 0
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; Bound: 50
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; Schema: 0
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OpCapability Shader
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %main "main" %tint_symbol %tint_symbol_2
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OpExecutionMode %main OriginUpperLeft
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OpName %x_GLF_color "x_GLF_color"
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OpName %gl_FragCoord "gl_FragCoord"
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OpName %tint_symbol "tint_symbol"
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OpName %tint_symbol_2 "tint_symbol_2"
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OpName %main_1 "main_1"
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OpName %main_out "main_out"
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OpMemberName %main_out 0 "x_GLF_color_1"
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OpName %tint_symbol_3 "tint_symbol_3"
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OpName %tint_symbol_1 "tint_symbol_1"
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OpName %main "main"
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OpDecorate %tint_symbol BuiltIn FragCoord
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OpDecorate %tint_symbol_2 Location 0
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OpMemberDecorate %main_out 0 Offset 0
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%float = OpTypeFloat 32
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%v4float = OpTypeVector %float 4
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%_ptr_Private_v4float = OpTypePointer Private %v4float
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%5 = OpConstantNull %v4float
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%x_GLF_color = OpVariable %_ptr_Private_v4float Private %5
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%gl_FragCoord = OpVariable %_ptr_Private_v4float Private %5
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%_ptr_Input_v4float = OpTypePointer Input %v4float
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%tint_symbol = OpVariable %_ptr_Input_v4float Input
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%_ptr_Output_v4float = OpTypePointer Output %v4float
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%tint_symbol_2 = OpVariable %_ptr_Output_v4float Output %5
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%void = OpTypeVoid
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%11 = OpTypeFunction %void
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%float_1 = OpConstant %float 1
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%float_0 = OpConstant %float 0
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%17 = OpConstantComposite %v4float %float_1 %float_0 %float_0 %float_1
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%bool = OpTypeBool
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%true = OpConstantTrue %bool
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%uint = OpTypeInt 32 0
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%uint_0 = OpConstant %uint 0
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%_ptr_Private_float = OpTypePointer Private %float
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%main_out = OpTypeStruct %v4float
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%37 = OpTypeFunction %void %main_out
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%main_1 = OpFunction %void None %11
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%14 = OpLabel
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OpStore %x_GLF_color %17
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OpSelectionMerge %20 None
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OpBranchConditional %true %21 %20
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%21 = OpLabel
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%25 = OpAccessChain %_ptr_Private_float %gl_FragCoord %uint_0
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%26 = OpLoad %float %25
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%27 = OpFOrdLessThan %bool %26 %float_0
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OpSelectionMerge %28 None
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OpBranchConditional %27 %29 %28
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%29 = OpLabel
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OpBranch %30
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%30 = OpLabel
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OpLoopMerge %31 %32 None
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OpBranch %33
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%33 = OpLabel
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OpStore %x_GLF_color %17
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OpBranch %32
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%32 = OpLabel
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%34 = OpAccessChain %_ptr_Private_float %gl_FragCoord %uint_0
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%35 = OpLoad %float %34
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%36 = OpFOrdLessThan %bool %35 %float_0
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OpBranchConditional %36 %30 %31
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%31 = OpLabel
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OpBranch %28
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%28 = OpLabel
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OpBranch %20
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%20 = OpLabel
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OpReturn
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OpFunctionEnd
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%tint_symbol_3 = OpFunction %void None %37
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%tint_symbol_1 = OpFunctionParameter %main_out
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%41 = OpLabel
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%42 = OpCompositeExtract %v4float %tint_symbol_1 0
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OpStore %tint_symbol_2 %42
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OpReturn
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OpFunctionEnd
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%main = OpFunction %void None %11
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%44 = OpLabel
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%45 = OpLoad %v4float %tint_symbol
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OpStore %gl_FragCoord %45
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%46 = OpFunctionCall %void %main_1
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%48 = OpLoad %v4float %x_GLF_color
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%49 = OpCompositeConstruct %main_out %48
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%47 = OpFunctionCall %void %tint_symbol_3 %49
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OpReturn
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OpFunctionEnd
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