Unsupported phi use of const or let variable
vsemozhetbyt opened this issue · 3 comments
vsemozhetbyt commented
New example ( v8 5.4.500.45 / Node.js 7.4.0):
'use strict';
let i;
for (i = 0; i < 1e7; i++) {}
let j;
for (j = 0; j < 1e7; j++) {}[marking 000001F62D3DF079 <JS Function (SharedFunctionInfo 000002B36CA679C1)> for optimized recompilation, reason: small function, ICs with typeinfo: 2/4 (50%), generic ICs: 0/4 (0%)]
[compiling method 000001F62D3DF079 <JS Function (SharedFunctionInfo 000002B36CA679C1)> using Crankshaft OSR]
[aborted optimizing 000001F62D3DF079 <JS Function (SharedFunctionInfo 000002B36CA679C1)> because: Unsupported phi use of const or let variable]
[disabled optimization for 000002B36CA679C1 <SharedFunctionInfo>, reason: Unsupported phi use of const or let variable]
It seems the deopt concerns some internal function for loops.
vsemozhetbyt commented
Compare:
'use strict';
let i;
for (i = 0; i < 1e7; i++) {}
for (i = 0; i < 1e7; i++) {}[marking 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> for optimized recompilation, reason: small function, ICs with typeinfo: 2/4 (50%), generic ICs: 0/4 (0%)]
[compiling method 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> using Crankshaft OSR]
[optimizing 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> - took 0.135, 0.174, 0.072 ms]
[deoptimizing (DEOPT soft): begin 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> (opt #0) @3, FP to SP delta: 32, caller sp: 0x002fe718]
;;; deoptimize at 456: Insufficient type feedback for combined type of binary operation
reading input frame => node=60, args=6, height=2; inputs:
0: 0x20e1c4df059 ; [fp - 16] 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)>
1: 0x20e1c4dc9c1 ; rdx 0000020E1C4DC9C1 <an Object with map 000002C946807011>
2: 0x23bbfa04311 ; (literal 2) 0000023BBFA04311 <undefined>
3: 0x23bbfa04311 ; (literal 2) 0000023BBFA04311 <undefined>
4: 0x23bbfa04311 ; (literal 2) 0000023BBFA04311 <undefined>
5: 0x23bbfa04311 ; (literal 2) 0000023BBFA04311 <undefined>
6: 0x23bbfa04311 ; (literal 2) 0000023BBFA04311 <undefined>
7: 0x23bbfa9e3f1 ; rbx 0000023BBFA9E3F1 <FixedArray[179]>
8: 0x00000000 ; rax 0
translating frame => node=60, height=8
0x002fe710: [top + 80] <- 0x20e1c4dc9c1 ; 0000020E1C4DC9C1 <an Object with map 000002C946807011> (input #1)
0x002fe708: [top + 72] <- 0x23bbfa04311 ; 0000023BBFA04311 <undefined> (input #2)
0x002fe700: [top + 64] <- 0x23bbfa04311 ; 0000023BBFA04311 <undefined> (input #3)
0x002fe6f8: [top + 56] <- 0x23bbfa04311 ; 0000023BBFA04311 <undefined> (input #4)
0x002fe6f0: [top + 48] <- 0x23bbfa04311 ; 0000023BBFA04311 <undefined> (input #5)
0x002fe6e8: [top + 40] <- 0x23bbfa04311 ; 0000023BBFA04311 <undefined> (input #6)
0x002fe6e0: [top + 32] <- 0xfb38444ce8 ; caller's pc
0x002fe6d8: [top + 24] <- 0x002fe788 ; caller's fp
0x002fe6d0: [top + 16] <- 0x23bbfa9e3f1 ; context 0000023BBFA9E3F1 <FixedArray[179]> (input #7)
0x002fe6c8: [top + 8] <- 0x20e1c4df059 ; function 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> (input #0)
0x002fe6c0: [top + 0] <- 0x00000000 ; 0 (input #8)
[deoptimizing (soft): end 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> @3 => node=60, pc=0xfb38445195, caller sp=0x002fe718, state=NO_REGISTERS, took 33.615 ms]
[removing optimized code for: ]
[evicting entry from optimizing code map (notify deoptimized) for 000000D6C4E679C1 <SharedFunctionInfo> (osr ast id 26)]
[marking 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> for optimized recompilation, reason: small function, ICs with typeinfo: 4/4 (100%), generic ICs: 0/4 (0%)]
[compiling method 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> using Crankshaft OSR]
[optimizing 0000020E1C4DF059 <JS Function (SharedFunctionInfo 000000D6C4E679C1)> - took 0.150, 0.255, 0.112 ms]
vsemozhetbyt commented
A v8 issue with more info.
vsemozhetbyt commented
It seems this is a bug posted and forgotten by myself)