[RISC-V] Single bit checks #117461

tomeksowi · 2025-07-09T14:39:26Z

Reuse and augment lowerings from mainstream platforms.

Base ISA only, bext(i) can be fitted easily in another PR once #115335 merges, it maps well to BITTEST_NE.

Part of #84834, cc @dotnet/samsung

dotnet-policy-service · 2025-07-09T14:40:19Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

tomeksowi · 2025-07-09T14:59:22Z

Diffs are based on 297,254 contexts (102,759 MinOpts, 194,495 FullOpts).

Overall (-362,976 bytes)

Collection	Base size (bytes)	Diff size (bytes)	PerfScore in Diffs
linux.riscv64.Checked.1.mch	281,376,692	-362,976	-0.29%

MinOpts (+0 bytes)

Collection	Base size (bytes)	Diff size (bytes)	PerfScore in Diffs
linux.riscv64.Checked.1.mch	148,101,028	+0	0.00%

FullOpts (-362,976 bytes)

Collection	Base size (bytes)	Diff size (bytes)	PerfScore in Diffs
linux.riscv64.Checked.1.mch	133,275,664	-362,976	-0.35%

Example diffs

linux.riscv64.Checked.1.mch

-24 (-30.00%) : 47851.dasm - Microsoft.CodeAnalysis.VisualBasic.Symbols.Metadata.PE.PEMethodSymbol+PackedFlags:TryGetHasSetsRequiredMembers(byref):bool:this (FullOpts)

@@ -25,26 +25,19 @@ G_M17699_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0C00 {a0 a1}, b
             ; byrRegs +[a0-a1]
             lw             a0, 0xD1FFAB1E(a0)
             ; byrRegs -[a0]
-            lui            a2, 0xD1FFAB1E
-            and            a2, a0, a2
-            sext.w         a2, a2
-            sext.w         a2, a2
-            sltu           a2, zero, a2
+            slli           a2, a0, 49
+            srli           a2, a2, 63
             sb             a2, 0xD1FFAB1E(a1)
-            lui            a1, 0xD1FFAB1E
-            ; byrRegs -[a1]
-            and            a0, a0, a1
-            sext.w         a0, a0
-            sext.w         a0, a0
-            sltu           a0, zero, a0
-						;; size=48 bbWeight=1 PerfScore 12.00
+            slli           a0, a0, 48
+            srli           a0, a0, 63
+						;; size=24 bbWeight=1 PerfScore 8.00
 G_M17699_IG03:        ; bbWeight=1, epilog, nogc, extend
             ld             ra, 8(sp)
             ld             fp, 0(sp)
             addi           sp, sp, 16
             ret						;; size=16 bbWeight=1 PerfScore 7.50
 
-; Total bytes of code 80, prolog size 16, PerfScore 28.50, instruction count 20, allocated bytes for code 80 (MethodHash=f9a2badc) for method Microsoft.CodeAnalysis.VisualBasic.Symbols.Metadata.PE.PEMethodSymbol+PackedFlags:TryGetHasSetsRequiredMembers(byref):bool:this (FullOpts)
+; Total bytes of code 56, prolog size 16, PerfScore 24.50, instruction count 14, allocated bytes for code 56 (MethodHash=f9a2badc) for method Microsoft.CodeAnalysis.VisualBasic.Symbols.Metadata.PE.PEMethodSymbol+PackedFlags:TryGetHasSetsRequiredMembers(byref):bool:this (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -55,7 +48,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 20 (0x00014) Actual length = 80 (0x000050)
+  Function Length   : 14 (0x0000e) Actual length = 56 (0x000038)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

-16 (-26.67%) : 26370.dasm - Microsoft.CodeAnalysis.VisualBasic.Symbols.SynthesizedDelegateMethodSymbol:get_IsOverridable():bool:this (FullOpts)

@@ -23,20 +23,16 @@ G_M2731_IG02:        ; bbWeight=1, gcrefRegs=0400 {a0}, byrefRegs=0000 {}, byref
             ; gcrRegs +[a0]
             lw             a0, 0xD1FFAB1E(a0)
             ; gcrRegs -[a0]
-            lui            a1, 0xD1FFAB1E
-            addiw          a1, a1, 0xD1FFAB1E
-            and            a0, a0, a1
-            sext.w         a0, a0
-            sext.w         a0, a0
-            sltu           a0, zero, a0
-						;; size=28 bbWeight=1 PerfScore 6.00
+            slli           a0, a0, 52
+            srli           a0, a0, 63
+						;; size=12 bbWeight=1 PerfScore 3.00
 G_M2731_IG03:        ; bbWeight=1, epilog, nogc, extend
             ld             ra, 8(sp)
             ld             fp, 0(sp)
             addi           sp, sp, 16
             ret						;; size=16 bbWeight=1 PerfScore 7.50
 
-; Total bytes of code 60, prolog size 16, PerfScore 22.50, instruction count 14, allocated bytes for code 60 (MethodHash=da9bf554) for method Microsoft.CodeAnalysis.VisualBasic.Symbols.SynthesizedDelegateMethodSymbol:get_IsOverridable():bool:this (FullOpts)
+; Total bytes of code 44, prolog size 16, PerfScore 19.50, instruction count 11, allocated bytes for code 44 (MethodHash=da9bf554) for method Microsoft.CodeAnalysis.VisualBasic.Symbols.SynthesizedDelegateMethodSymbol:get_IsOverridable():bool:this (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -47,7 +43,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 15 (0x0000f) Actual length = 60 (0x00003c)
+  Function Length   : 11 (0x0000b) Actual length = 44 (0x00002c)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

-16 (-26.67%) : 249955.dasm - System.Text.RegularExpressions.Symbolic.MatchingState`1[byte]:IsNullableFor(uint):bool:this (FullOpts)

@@ -25,20 +25,16 @@ G_M21865_IG02:        ; bbWeight=1, gcrefRegs=0400 {a0}, byrefRegs=0000 {}, byre
             ; gcrRegs +[a0]
             lw             a0, 0xD1FFAB1E(a0)
             ; gcrRegs -[a0]
-            addi           a2, zero, 0xD1FFAB1E
-            sllw           a1, a2, a1
-            and            a0, a0, a1
-            sext.w         a0, a0
-            sext.w         a0, a0
-            sltu           a0, zero, a0
-						;; size=28 bbWeight=1 PerfScore 5.00
+            sraw           a0, a0, a1
+            andi           a0, a0, 1
+						;; size=12 bbWeight=1 PerfScore 3.00
 G_M21865_IG03:        ; bbWeight=1, epilog, nogc, extend
             ld             ra, 8(sp)
             ld             fp, 0(sp)
             addi           sp, sp, 16
             ret						;; size=16 bbWeight=1 PerfScore 7.50
 
-; Total bytes of code 60, prolog size 16, PerfScore 21.50, instruction count 15, allocated bytes for code 60 (MethodHash=569daa96) for method System.Text.RegularExpressions.Symbolic.MatchingState`1[byte]:IsNullableFor(uint):bool:this (FullOpts)
+; Total bytes of code 44, prolog size 16, PerfScore 19.50, instruction count 11, allocated bytes for code 44 (MethodHash=569daa96) for method System.Text.RegularExpressions.Symbolic.MatchingState`1[byte]:IsNullableFor(uint):bool:this (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -49,7 +45,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 15 (0x0000f) Actual length = 60 (0x00003c)
+  Function Length   : 11 (0x0000b) Actual length = 44 (0x00002c)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

+4 (+9.09%) : 44466.dasm - Microsoft.CodeAnalysis.VisualBasic.Conversions:IsIdentityConversion(int):bool (FullOpts)

@@ -20,17 +20,18 @@ G_M16914_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mv             fp, sp
 						;; size=16 bbWeight=1 PerfScore 9.00
 G_M16914_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+            not            a0, a0
             andi           a0, a0, 5
-            addiw          a0, a0, 0xD1FFAB1E
+            sext.w         a0, a0
             sltiu          a0, a0, 1
-						;; size=12 bbWeight=1 PerfScore 1.50
+						;; size=16 bbWeight=1 PerfScore 2.00
 G_M16914_IG03:        ; bbWeight=1, epilog, nogc, extend
             ld             ra, 8(sp)
             ld             fp, 0(sp)
             addi           sp, sp, 16
             ret						;; size=16 bbWeight=1 PerfScore 7.50
 
-; Total bytes of code 44, prolog size 16, PerfScore 18.00, instruction count 11, allocated bytes for code 44 (MethodHash=e888bded) for method Microsoft.CodeAnalysis.VisualBasic.Conversions:IsIdentityConversion(int):bool (FullOpts)
+; Total bytes of code 48, prolog size 16, PerfScore 18.50, instruction count 12, allocated bytes for code 48 (MethodHash=e888bded) for method Microsoft.CodeAnalysis.VisualBasic.Conversions:IsIdentityConversion(int):bool (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -41,7 +42,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 11 (0x0000b) Actual length = 44 (0x00002c)
+  Function Length   : 12 (0x0000c) Actual length = 48 (0x000030)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

+4 (+8.33%) : 44364.dasm - Microsoft.CodeAnalysis.VisualBasic.Conversion:get_IsIdentity():bool:this (FullOpts)

@@ -25,17 +25,18 @@ G_M36159_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0400 {a0}, byre
             ; byrRegs +[a0]
             lw             a0, 0xD1FFAB1E(a0)
             ; byrRegs -[a0]
+            not            a0, a0
             andi           a0, a0, 5
-            addiw          a0, a0, 0xD1FFAB1E
+            sext.w         a0, a0
             sltiu          a0, a0, 1
-						;; size=16 bbWeight=1 PerfScore 3.50
+						;; size=20 bbWeight=1 PerfScore 4.00
 G_M36159_IG03:        ; bbWeight=1, epilog, nogc, extend
             ld             ra, 8(sp)
             ld             fp, 0(sp)
             addi           sp, sp, 16
             ret						;; size=16 bbWeight=1 PerfScore 7.50
 
-; Total bytes of code 48, prolog size 16, PerfScore 20.00, instruction count 12, allocated bytes for code 48 (MethodHash=e6d072c0) for method Microsoft.CodeAnalysis.VisualBasic.Conversion:get_IsIdentity():bool:this (FullOpts)
+; Total bytes of code 52, prolog size 16, PerfScore 20.50, instruction count 13, allocated bytes for code 52 (MethodHash=e6d072c0) for method Microsoft.CodeAnalysis.VisualBasic.Conversion:get_IsIdentity():bool:this (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -46,7 +47,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 12 (0x0000c) Actual length = 48 (0x000030)
+  Function Length   : 13 (0x0000d) Actual length = 52 (0x000034)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

+4 (+7.14%) : 21967.dasm - Microsoft.CodeAnalysis.VisualBasic.LookupOptionExtensions:IsAttributeTypeLookup(int):bool (FullOpts)

@@ -20,20 +20,21 @@ G_M45402_IG01:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref,
             mv             fp, sp
 						;; size=16 bbWeight=1 PerfScore 9.00
 G_M45402_IG02:        ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref
+            not            a0, a0
             lui            a1, 0xD1FFAB1E
             addiw          a1, a1, 0xD1FFAB1E
             and            a0, a0, a1
             sext.w         a0, a0
-            subw           a0, a0, a1
+            sext.w         a0, a0
             sltiu          a0, a0, 1
-						;; size=24 bbWeight=1 PerfScore 4.00
+						;; size=28 bbWeight=1 PerfScore 4.50
 G_M45402_IG03:        ; bbWeight=1, epilog, nogc, extend
             ld             ra, 8(sp)
             ld             fp, 0(sp)
             addi           sp, sp, 16
             ret						;; size=16 bbWeight=1 PerfScore 7.50
 
-; Total bytes of code 56, prolog size 16, PerfScore 20.50, instruction count 13, allocated bytes for code 56 (MethodHash=e1cf4ea5) for method Microsoft.CodeAnalysis.VisualBasic.LookupOptionExtensions:IsAttributeTypeLookup(int):bool (FullOpts)
+; Total bytes of code 60, prolog size 16, PerfScore 21.00, instruction count 14, allocated bytes for code 60 (MethodHash=e1cf4ea5) for method Microsoft.CodeAnalysis.VisualBasic.LookupOptionExtensions:IsAttributeTypeLookup(int):bool (FullOpts)
 ; ============================================================
 
 Unwind Info:
@@ -44,7 +45,7 @@ Unwind Info:
   E bit             : 0
   X bit             : 0
   Vers              : 0
-  Function Length   : 14 (0x0000e) Actual length = 56 (0x000038)
+  Function Length   : 15 (0x0000f) Actual length = 60 (0x00003c)
   ---- Epilog scopes ----
   ---- Scope 0
   Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

Details

Size improvements/regressions per collection

Collection	Contexts with diffs	Improvements	Regressions	Same size	Improvements (bytes)	Regressions (bytes)
linux.riscv64.Checked.1.mch	63,277	42,670	6	20,601	-363,000	+24

PerfScore improvements/regressions per collection

Collection	Contexts with diffs	Improvements	Regressions	Same PerfScore	Improvements (PerfScore)	Regressions (PerfScore)	PerfScore Overall in FullOpts
linux.riscv64.Checked.1.mch	63,277	41,285	663	21,329	-0.45%	+0.37%	-0.0949%

Context information

Collection	Diffed contexts	MinOpts	FullOpts	Missed, base	Missed, diff
linux.riscv64.Checked.1.mch	297,254	102,759	194,495	0 (0.00%)	0 (0.00%)

jit-analyze output

The few +1 instruction regressions should disappear once we introduce some sign-extension elimination.

risc-vv · 2025-07-09T15:38:35Z

RISC-V Release-FX-QEMU: 212796 / 214790 (99.07%)

=======================
      passed: 212796
      failed: 1987
     skipped: 39
      killed: 7
------------------------
 TOTAL tests: 214829
VIRTUAL time: 32h 30min 23s 166ms
   REAL time: 57min 25s 85ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

Build information and commands

GIT: 6686029c8a8780c5f8284fc641437b32f53053e3
CI: d6c9c1ab3a7411819463edc05ded301e89ba586a
REPO: dotnet/runtime
BRANCH: main
CONFIG: Release
LIB_CONFIG: Release

risc-vv · 2025-07-09T16:14:36Z

RISC-V Release-CLR-QEMU: 9060 / 9112 (99.43%)

=======================
      passed: 9060
      failed: 24
     skipped: 597
      killed: 28
------------------------
 TOTAL tests: 9709
VIRTUAL time: 38h 47min 56s 982ms
   REAL time: 53min 9s 653ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

Build information and commands

GIT: 6686029c8a8780c5f8284fc641437b32f53053e3
CI: d6c9c1ab3a7411819463edc05ded301e89ba586a
REPO: dotnet/runtime
BRANCH: main
CONFIG: Release
LIB_CONFIG: Release

risc-vv · 2025-07-10T08:09:55Z

RISC-V Release-CLR-QEMU: 9082 / 9112 (99.67%)

=======================
      passed: 9082
      failed: 2
     skipped: 597
      killed: 28
------------------------
 TOTAL tests: 9709
VIRTUAL time: 37h 25min 11s 36ms
   REAL time: 38min 8s 328ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

RISC-V Release-CLR-VF2: 9083 / 9113 (99.67%)

=======================
      passed: 9083
      failed: 2
     skipped: 597
      killed: 28
------------------------
 TOTAL tests: 9710
VIRTUAL time: 12h 4min 25s 774ms
   REAL time: 48min 47s 134ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

RISC-V Release-FX-QEMU: 281996 / 283078 (99.62%)

=======================
      passed: 281996
      failed: 1074
     skipped: 39
      killed: 8
------------------------
 TOTAL tests: 283117
VIRTUAL time: 32h 12min 55s 844ms
   REAL time: 1h 11min 58s 693ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

RISC-V Release-FX-VF2: 510734 / 512476 (99.66%)

=======================
      passed: 510734
      failed: 1735
     skipped: 39
      killed: 7
------------------------
 TOTAL tests: 512515
VIRTUAL time: 21h 42min 5s 376ms
   REAL time: 2h 17min 38s 325ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

Build information and commands

GIT: 514fa0e8a7a13f2a0c974f50959b21721e4b1646
CI: d6c9c1ab3a7411819463edc05ded301e89ba586a
REPO: dotnet/runtime
BRANCH: main
CONFIG: Release
LIB_CONFIG: Release

sirntar · 2025-07-17T14:31:35Z

@risc-vv /run

risc-vv · 2025-07-17T14:33:06Z

RISC-V Release-CLR-QEMU: 9087 / 9117 (99.67%)

=======================
      passed: 9087
      failed: 2
     skipped: 597
      killed: 28
------------------------
 TOTAL tests: 9714
VIRTUAL time: 37h 22min 9s 676ms
   REAL time: 38min 11s 193ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

RISC-V Release-CLR-VF2: 9087 / 9117 (99.67%)

=======================
      passed: 9087
      failed: 2
     skipped: 597
      killed: 28
------------------------
 TOTAL tests: 9714
VIRTUAL time: 11h 46min 35s 674ms
   REAL time: 47min 39s 595ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

RISC-V Release-FX-QEMU: 279251 / 280326 (99.62%)

=======================
      passed: 279251
      failed: 1068
     skipped: 39
      killed: 7
------------------------
 TOTAL tests: 280365
VIRTUAL time: 30h 41min 52s 406ms
   REAL time: 1h 12min 13s 708ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

RISC-V Release-FX-VF2: 308242 / 309993 (99.44%)

=======================
      passed: 308242
      failed: 1743
     skipped: 39
      killed: 8
------------------------
 TOTAL tests: 310032
VIRTUAL time: 21h 19min 58s 889ms
   REAL time: 2h 14min 9s 329ms
=======================

report.xml, report.md, failures.xml, testclr_details.tar.zst

Build information and commands

GIT: 514fa0e8a7a13f2a0c974f50959b21721e4b1646
CI: 785da59dadeb491bca87651db4b40a68883f8a00
REPO: dotnet/runtime
BRANCH: main
CONFIG: Release
LIB_CONFIG: Release

JulieLeeMSFT · 2025-08-11T15:44:07Z

cc @jakobbotsch.

jakobbotsch · 2025-08-12T10:48:27Z

Won't get to this until next week after .NET 10 snap.

JulieLeeMSFT · 2025-09-08T16:24:59Z

.NET 10 RC2 snap is Sept 22nd. We will review this after that.

tomeksowi added 2 commits July 9, 2025 16:20

Lower const single bit test, variable WiP

d2b8729

Reuse xarch code for extracting bit index

6686029

github-actions bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Jul 9, 2025

dotnet-policy-service bot added the community-contribution Indicates that the PR has been added by a community member label Jul 9, 2025

build-analysis bot mentioned this pull request Jul 9, 2025

browser-wasm Windows build error #116746

Closed

clamp03 assigned tomeksowi Jul 10, 2025

clamp03 added the arch-riscv Related to the RISC-V architecture label Jul 10, 2025

Disable removeCast

514fa0e

tomeksowi marked this pull request as draft July 10, 2025 08:16

build-analysis bot mentioned this pull request Jul 10, 2025

Occasional failure in "browser-wasm windows Release LibraryTests: Build Product" #116671

Closed

tomeksowi marked this pull request as ready for review July 10, 2025 12:39

JulieLeeMSFT requested a review from clamp03 August 11, 2025 15:42

clamp03 approved these changes Aug 12, 2025

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