Created
October 27, 2016 07:24
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more Zig IR progress
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| =============== zig code ===================== | |
| extern fn something(); | |
| export fn doSomethingTenTimes(x: i32) { | |
| {var i: i32 = 0; while (i < 10; i += 1) { | |
| if (i == 4) i += x; | |
| something(); | |
| }} | |
| } | |
| =============== IR generation ===================== | |
| fn doSomethingTenTimes { | |
| Entry_0: | |
| #1 | type | 1 | i32 | |
| #2 | (integer literal)| 1 | 0 | |
| #3 | void | - | var i: i32 = 0 | |
| #8 | unreachable | - | goto $WhileCond_4 | |
| WhileCond_4: | |
| #16 | (unknown) | 1 | &i | |
| #17 | (unknown) | 1 | *#16 | |
| #18 | (integer literal)| 1 | 10 | |
| #19 | (unknown) | 1 | #17 < 10 | |
| #20 | unreachable | - | if (#19) $WhileBody_5 else $WhileEnd_7 | |
| WhileBody_5: | |
| #21 | (unknown) | 1 | &i | |
| #22 | (unknown) | 1 | *#21 | |
| #23 | (integer literal)| 1 | 4 | |
| #24 | (unknown) | 1 | #22 == 4 | |
| #28 | unreachable | - | if (#24) $Then_25 else $Else_26 | |
| WhileContinue_6: | |
| #9 | (unknown) | 2 | &i | |
| #10 | (unknown) | 1 | *#9 | |
| #11 | (integer literal)| 1 | 1 | |
| #12 | (unknown) | 1 | #10 + 1 | |
| #13 | void | - | *#9 = #12 | |
| #14 | void | 0 | {} | |
| #15 | unreachable | - | goto $WhileCond_4 | |
| WhileEnd_7: | |
| #45 | void | 1 | {} | |
| #46 | unreachable | - | return {} | |
| Then_25: | |
| #29 | (unknown) | 2 | &i | |
| #30 | (unknown) | 1 | *#29 | |
| #31 | (unknown) | 1 | &x | |
| #32 | (unknown) | 1 | *#31 | |
| #33 | (unknown) | 1 | #30 + #32 | |
| #34 | void | - | *#29 = #33 | |
| #35 | void | 1 | {} | |
| #36 | unreachable | - | goto $EndIf_27 | |
| Else_26: | |
| #37 | void | 1 | {} | |
| #38 | unreachable | - | goto $EndIf_27 | |
| EndIf_27: | |
| #39 | (unknown) | 0 | $Then_25:{} $Else_26:{} | |
| #40 | void | 0 | {} | |
| #41 | extern fn() | 1 | something | |
| #42 | (unknown) | - | something() | |
| #43 | void | 0 | {} | |
| #44 | unreachable | - | goto $WhileContinue_6 | |
| } | |
| =============== IR analysis ===================== | |
| fn doSomethingTenTimes { // (analyzed) | |
| Entry_0: | |
| #3 | void | - | var i: i32 = 0 | |
| #8 | void | - | something() | |
| #15 | void | - | something() | |
| #22 | void | - | something() | |
| #29 | void | - | something() | |
| #36 | &i32 | 1 | &x | |
| #37 | i32 | 1 | *#36 | |
| #38 | i32 | 1 | 4 + #37 | |
| #39 | &i32 | 1 | &i | |
| #40 | void | - | *#39 = #38 | |
| #41 | void | - | something() | |
| #42 | &i32 | 2 | &i | |
| #43 | i32 | 1 | *#42 | |
| #46 | i32 | 1 | #43 + 1 | |
| #47 | void | - | *#42 = #46 | |
| #48 | &i32 | 1 | &i | |
| #49 | i32 | 1 | *#48 | |
| #52 | bool | 1 | #49 < 10 | |
| #55 | unreachable | - | if (#52) $WhileBody_53 else $WhileEnd_54 | |
| WhileBody_53: | |
| #56 | &i32 | 1 | &i | |
| #57 | i32 | 1 | *#56 | |
| #60 | bool | 1 | #57 == 4 | |
| #63 | unreachable | - | if (#60) $Then_61 else $Else_62 | |
| WhileEnd_54: | |
| #64 | unreachable | - | return {} | |
| Then_61: | |
| #65 | &i32 | 2 | &i | |
| #66 | i32 | 1 | *#65 | |
| #67 | &i32 | 1 | &x | |
| #68 | i32 | 1 | *#67 | |
| #69 | i32 | 1 | #66 + #68 | |
| #70 | void | - | *#65 = #69 | |
| #71 | void | - | something() | |
| #72 | &i32 | 2 | &i | |
| #73 | i32 | 1 | *#72 | |
| #76 | i32 | 1 | #73 + 1 | |
| #77 | void | - | *#72 = #76 | |
| #78 | &i32 | 1 | &i | |
| #79 | i32 | 1 | *#78 | |
| #82 | bool | 1 | #79 < 10 | |
| #83 | unreachable | - | if (#82) $WhileBody_53 else $WhileEnd_54 | |
| Else_62: | |
| #84 | void | - | something() | |
| #85 | &i32 | 2 | &i | |
| #86 | i32 | 1 | *#85 | |
| #89 | i32 | 1 | #86 + 1 | |
| #90 | void | - | *#85 = #89 | |
| #91 | &i32 | 1 | &i | |
| #92 | i32 | 1 | *#91 | |
| #95 | bool | 1 | #92 < 10 | |
| #96 | unreachable | - | if (#95) $WhileBody_53 else $WhileEnd_54 | |
| } | |
| =============== LLVM code generation ===================== | |
| define void @doSomethingTenTimes(i32) #2 !dbg !4 { | |
| Entry: | |
| %x = alloca i32, align 4 | |
| %i = alloca i32, align 4 | |
| store i32 %0, i32* %x | |
| call void @llvm.dbg.declare(metadata i32* %x, metadata !11, metadata !15), !dbg !16 | |
| store i32 0, i32* %i, !dbg !17 | |
| call void @llvm.dbg.declare(metadata i32* %i, metadata !12, metadata !15), !dbg !17 | |
| call void @something(), !dbg !18 | |
| call void @something(), !dbg !18 | |
| call void @something(), !dbg !18 | |
| call void @something(), !dbg !18 | |
| %1 = load i32, i32* %x, !dbg !20 | |
| %2 = add nsw i32 4, %1, !dbg !21 | |
| store i32 %2, i32* %i, !dbg !21 | |
| call void @something(), !dbg !18 | |
| %3 = load i32, i32* %i, !dbg !22 | |
| %4 = add nsw i32 %3, 1, !dbg !23 | |
| store i32 %4, i32* %i, !dbg !23 | |
| %5 = load i32, i32* %i, !dbg !24 | |
| %6 = icmp slt i32 %5, 10, !dbg !25 | |
| br i1 %6, label %WhileBody, label %WhileEnd, !dbg !25 | |
| WhileBody: ; preds = %Else, %Then, %Entry | |
| %7 = load i32, i32* %i, !dbg !26 | |
| %8 = icmp eq i32 %7, 4, !dbg !27 | |
| br i1 %8, label %Then, label %Else, !dbg !27 | |
| WhileEnd: ; preds = %Else, %Then, %Entry | |
| ret void, !dbg !28 | |
| Then: ; preds = %WhileBody | |
| %9 = load i32, i32* %i, !dbg !29 | |
| %10 = load i32, i32* %x, !dbg !20 | |
| %11 = add nsw i32 %9, %10, !dbg !21 | |
| store i32 %11, i32* %i, !dbg !21 | |
| call void @something(), !dbg !18 | |
| %12 = load i32, i32* %i, !dbg !22 | |
| %13 = add nsw i32 %12, 1, !dbg !23 | |
| store i32 %13, i32* %i, !dbg !23 | |
| %14 = load i32, i32* %i, !dbg !24 | |
| %15 = icmp slt i32 %14, 10, !dbg !25 | |
| br i1 %15, label %WhileBody, label %WhileEnd, !dbg !25 | |
| Else: ; preds = %WhileBody | |
| call void @something(), !dbg !18 | |
| %16 = load i32, i32* %i, !dbg !22 | |
| %17 = add nsw i32 %16, 1, !dbg !23 | |
| store i32 %17, i32* %i, !dbg !23 | |
| %18 = load i32, i32* %i, !dbg !24 | |
| %19 = icmp slt i32 %18, 10, !dbg !25 | |
| br i1 %19, label %WhileBody, label %WhileEnd, !dbg !25 | |
| } | |
| =============== LLVM optimization pass ===================== | |
| define void @doSomethingTenTimes(i32) local_unnamed_addr #0 !dbg !4 { | |
| Entry: | |
| tail call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !11, metadata !15), !dbg !16 | |
| tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !12, metadata !15), !dbg !17 | |
| tail call void @something() #2, !dbg !18 | |
| tail call void @something() #2, !dbg !18 | |
| tail call void @something() #2, !dbg !18 | |
| tail call void @something() #2, !dbg !18 | |
| tail call void @something() #2, !dbg !18 | |
| %1 = add i32 %0, 5, !dbg !20 | |
| tail call void @llvm.dbg.value(metadata i32 %1, i64 0, metadata !12, metadata !15), !dbg !17 | |
| %2 = icmp slt i32 %1, 10, !dbg !21 | |
| br i1 %2, label %WhileBody.preheader, label %WhileEnd, !dbg !21 | |
| WhileBody.preheader: ; preds = %Entry | |
| br label %WhileBody, !dbg !22 | |
| WhileBody: ; preds = %WhileBody.backedge, %WhileBody.preheader | |
| %i.0 = phi i32 [ %1, %WhileBody.preheader ], [ %i.0.be, %WhileBody.backedge ] | |
| %3 = icmp eq i32 %i.0, 4, !dbg !22 | |
| tail call void @something() #2, !dbg !18 | |
| br i1 %3, label %WhileBody.backedge, label %Else, !dbg !22 | |
| WhileBody.backedge: ; preds = %WhileBody, %Else | |
| %i.0.be = phi i32 [ %4, %Else ], [ %1, %WhileBody ] | |
| br label %WhileBody, !dbg !22 | |
| WhileEnd.loopexit: ; preds = %Else | |
| br label %WhileEnd, !dbg !23 | |
| WhileEnd: ; preds = %WhileEnd.loopexit, %Entry | |
| ret void, !dbg !23 | |
| Else: ; preds = %WhileBody | |
| %4 = add nsw i32 %i.0, 1, !dbg !20 | |
| tail call void @llvm.dbg.value(metadata i32 %4, i64 0, metadata !12, metadata !15), !dbg !17 | |
| %5 = icmp slt i32 %4, 10, !dbg !21 | |
| br i1 %5, label %WhileBody.backedge, label %WhileEnd.loopexit, !dbg !21 | |
| } |
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