[wasm] Bump chrome for testing - linux: 119.0.6045.159, windows: 119.0.6045.160 #32
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davidwrighton
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Mar 11, 2025
…3178) Based on the new `FIELD_LIST` support for returns this PR adds support for the JIT to combine smaller fields via bitwise operations when returned, instead of spilling these to stack. win-x64 examples: ```csharp static int? Test() { return Environment.TickCount; } ``` ```diff call System.Environment:get_TickCount():int - mov dword ptr [rsp+0x24], eax - mov byte ptr [rsp+0x20], 1 - mov rax, qword ptr [rsp+0x20] - ;; size=19 bbWeight=1 PerfScore 4.00 + mov eax, eax + shl rax, 32 + or rax, 1 + ;; size=15 bbWeight=1 PerfScore 2.00 ``` (the `mov eax, eax` is unnecessary, but not that simple to get rid of) ```csharp static (int x, float y) Test(int x, float y) { return (x, y); } ``` ```diff - mov dword ptr [rsp], ecx - vmovss dword ptr [rsp+0x04], xmm1 - mov rax, qword ptr [rsp] + vmovd eax, xmm1 + shl rax, 32 + mov ecx, ecx + or rax, rcx ;; size=13 bbWeight=1 PerfScore 3.00 ``` An arm64 example: ```csharp static Memory<int> ToMemory(int[] arr) { return arr.AsMemory(); } ``` ```diff G_M45070_IG01: ;; offset=0x0000 - stp fp, lr, [sp, #-0x20]! + stp fp, lr, [sp, #-0x10]! mov fp, sp - str xzr, [fp, #0x10] // [V03 tmp2] - ;; size=12 bbWeight=1 PerfScore 2.50 -G_M45070_IG02: ;; offset=0x000C + ;; size=8 bbWeight=1 PerfScore 1.50 +G_M45070_IG02: ;; offset=0x0008 cbz x0, G_M45070_IG06 ;; size=4 bbWeight=1 PerfScore 1.00 -G_M45070_IG03: ;; offset=0x0010 - str x0, [fp, #0x10] // [V07 tmp6] - str wzr, [fp, #0x18] // [V08 tmp7] - ldr x0, [fp, #0x10] // [V07 tmp6] - ldr w0, [x0, #0x08] - str w0, [fp, #0x1C] // [V09 tmp8] - ;; size=20 bbWeight=0.80 PerfScore 6.40 -G_M45070_IG04: ;; offset=0x0024 - ldp x0, x1, [fp, #0x10] // [V03 tmp2], [V03 tmp2+0x08] - ;; size=4 bbWeight=1 PerfScore 3.00 -G_M45070_IG05: ;; offset=0x0028 - ldp fp, lr, [sp], #0x20 +G_M45070_IG03: ;; offset=0x000C + ldr w1, [x0, #0x08] + ;; size=4 bbWeight=0.80 PerfScore 2.40 +G_M45070_IG04: ;; offset=0x0010 + mov w1, w1 + mov x2, xzr + orr x1, x2, x1, LSL #32 + ;; size=12 bbWeight=1 PerfScore 2.00 +G_M45070_IG05: ;; offset=0x001C + ldp fp, lr, [sp], #0x10 ret lr ;; size=8 bbWeight=1 PerfScore 2.00 -G_M45070_IG06: ;; offset=0x0030 - str xzr, [fp, #0x10] // [V07 tmp6] - str xzr, [fp, #0x18] +G_M45070_IG06: ;; offset=0x0024 + mov x0, xzr + mov w1, wzr b G_M45070_IG04 - ;; size=12 bbWeight=0.20 PerfScore 0.60 + ;; size=12 bbWeight=0.20 PerfScore 0.40 ``` (sneak peek -- this codegen requires some supplementary changes, and there's additional opportunities here) This is the return counterpart to dotnet#112740. That PR has a bunch of regressions that makes it look like we need to support returns/call arguments first, before we try to support parameters. There's a few follow-ups here: - Support for float->float insertions (when a float value needs to be returned as the 1st, 2nd, .... field of a SIMD register) - Support for coalescing memory loads, particularly because the fields of the `FIELD_LIST` come from a promoted struct that ended up DNER. In those cases we should be able to recombine the fields back to a single large field, instead of combining them with bitwise operations. - Support for constant folding the bitwise insertions. This requires some more constant folding support in lowering. - The JIT has lots of (now outdated) restrictions based around multi-reg returns that get in the way. Lifting these should improve things considerably.
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