cmd/compile/internal/test: TestMergeLocalsIntegration failures [consistent failure]

[gopherbot]

#!watchflakes
default <- pkg == "cmd/compile/internal/test" && test == "TestMergeLocalsIntegration"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=4100 hp=true align=4 t=Pointery
         1: integration.go:65:10 "p2" sz=4100 hp=true align=4 t=Pointery
         2: integration.go:71:7 "xp3" sz=4100 hp=true align=4 t=Pointery2
         3: integration.go:82:7 "xp4" sz=4100 hp=true align=4 t=Pointery2
         4: integration.go:48:7 "v2" sz=4100 hp=false align=4 t=Vanilla
         5: integration.go:53:7 "v3" sz=4100 hp=false align=4 t=Vanilla2
         6: integration.go:60:6 "s" sz=4096 hp=false align=4 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.04s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/compile/internal/test" && test == "TestMergeLocalsIntegration"

2026-07-20 19:45 gotip-linux-arm go@06bc6592 cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=4100 hp=true align=4 t=Pointery
         1: integration.go:65:10 "p2" sz=4100 hp=true align=4 t=Pointery
         2: integration.go:71:7 "xp3" sz=4100 hp=true align=4 t=Pointery2
         3: integration.go:82:7 "xp4" sz=4100 hp=true align=4 t=Pointery2
         4: integration.go:48:7 "v2" sz=4100 hp=false align=4 t=Vanilla
         5: integration.go:53:7 "v3" sz=4100 hp=false align=4 t=Vanilla2
         6: integration.go:60:6 "s" sz=4096 hp=false align=4 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.04s)

2026-07-20 19:51 gotip-linux-arm go@7db85e38 cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=4100 hp=true align=4 t=Pointery
         1: integration.go:65:10 "p2" sz=4100 hp=true align=4 t=Pointery
         2: integration.go:71:7 "xp3" sz=4100 hp=true align=4 t=Pointery2
         3: integration.go:82:7 "xp4" sz=4100 hp=true align=4 t=Pointery2
         4: integration.go:48:7 "v2" sz=4100 hp=false align=4 t=Vanilla
         5: integration.go:53:7 "v3" sz=4100 hp=false align=4 t=Vanilla2
         6: integration.go:60:6 "s" sz=4096 hp=false align=4 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.06s)

2026-07-20 21:24 gotip-linux-arm go@0c0dacdf cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=4100 hp=true align=4 t=Pointery
         1: integration.go:65:10 "p2" sz=4100 hp=true align=4 t=Pointery
         2: integration.go:71:7 "xp3" sz=4100 hp=true align=4 t=Pointery2
         3: integration.go:82:7 "xp4" sz=4100 hp=true align=4 t=Pointery2
         4: integration.go:48:7 "v2" sz=4100 hp=false align=4 t=Vanilla
         5: integration.go:53:7 "v3" sz=4100 hp=false align=4 t=Vanilla2
         6: integration.go:60:6 "s" sz=4096 hp=false align=4 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.05s)

2026-07-20 21:58 gotip-linux-arm go@1c3a1bac cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=4100 hp=true align=4 t=Pointery
         1: integration.go:65:10 "p2" sz=4100 hp=true align=4 t=Pointery
         2: integration.go:71:7 "xp3" sz=4100 hp=true align=4 t=Pointery2
         3: integration.go:82:7 "xp4" sz=4100 hp=true align=4 t=Pointery2
         4: integration.go:48:7 "v2" sz=4100 hp=false align=4 t=Vanilla
         5: integration.go:53:7 "v3" sz=4100 hp=false align=4 t=Vanilla2
         6: integration.go:60:6 "s" sz=4096 hp=false align=4 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.10s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/compile/internal/test" && test == "TestMergeLocalsIntegration"

2026-07-20 19:45 gotip-linux-riscv64 go@06bc6592 cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=8200 hp=true align=8 t=Pointery
         1: integration.go:65:10 "p2" sz=8200 hp=true align=8 t=Pointery
         2: integration.go:71:7 "xp3" sz=8200 hp=true align=8 t=Pointery2
         3: integration.go:82:7 "xp4" sz=8200 hp=true align=8 t=Pointery2
         4: integration.go:48:7 "v2" sz=8200 hp=false align=8 t=Vanilla
         5: integration.go:53:7 "v3" sz=8200 hp=false align=8 t=Vanilla2
         6: integration.go:60:6 "s" sz=8192 hp=false align=8 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.05s)

2026-07-20 19:51 gotip-linux-riscv64 go@7db85e38 cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=8200 hp=true align=8 t=Pointery
         1: integration.go:65:10 "p2" sz=8200 hp=true align=8 t=Pointery
         2: integration.go:71:7 "xp3" sz=8200 hp=true align=8 t=Pointery2
         3: integration.go:82:7 "xp4" sz=8200 hp=true align=8 t=Pointery2
         4: integration.go:48:7 "v2" sz=8200 hp=false align=8 t=Vanilla
         5: integration.go:53:7 "v3" sz=8200 hp=false align=8 t=Vanilla2
         6: integration.go:60:6 "s" sz=8192 hp=false align=8 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.05s)

2026-07-20 21:24 gotip-linux-riscv64 go@0c0dacdf cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=8200 hp=true align=8 t=Pointery
         1: integration.go:65:10 "p2" sz=8200 hp=true align=8 t=Pointery
         2: integration.go:71:7 "xp3" sz=8200 hp=true align=8 t=Pointery2
         3: integration.go:82:7 "xp4" sz=8200 hp=true align=8 t=Pointery2
         4: integration.go:48:7 "v2" sz=8200 hp=false align=8 t=Vanilla
         5: integration.go:53:7 "v3" sz=8200 hp=false align=8 t=Vanilla2
         6: integration.go:60:6 "s" sz=8192 hp=false align=8 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.11s)

2026-07-20 21:58 gotip-linux-riscv64 go@1c3a1bac cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=8200 hp=true align=8 t=Pointery
         1: integration.go:65:10 "p2" sz=8200 hp=true align=8 t=Pointery
         2: integration.go:71:7 "xp3" sz=8200 hp=true align=8 t=Pointery2
         3: integration.go:82:7 "xp4" sz=8200 hp=true align=8 t=Pointery2
         4: integration.go:48:7 "v2" sz=8200 hp=false align=8 t=Vanilla
         5: integration.go:53:7 "v3" sz=8200 hp=false align=8 t=Vanilla2
         6: integration.go:60:6 "s" sz=8192 hp=false align=8 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.06s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/compile/internal/test" && test == "TestMergeLocalsIntegration"

2026-07-21 11:24 gotip-linux-arm go@fb60d8cd cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=4100 hp=true align=4 t=Pointery
         1: integration.go:65:10 "p2" sz=4100 hp=true align=4 t=Pointery
         2: integration.go:71:7 "xp3" sz=4100 hp=true align=4 t=Pointery2
         3: integration.go:82:7 "xp4" sz=4100 hp=true align=4 t=Pointery2
         4: integration.go:48:7 "v2" sz=4100 hp=false align=4 t=Vanilla
         5: integration.go:53:7 "v3" sz=4100 hp=false align=4 t=Vanilla2
         6: integration.go:60:6 "s" sz=4096 hp=false align=4 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.06s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/compile/internal/test" && test == "TestMergeLocalsIntegration"

2026-07-21 11:24 gotip-linux-riscv64 go@fb60d8cd cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=8200 hp=true align=8 t=Pointery
         1: integration.go:65:10 "p2" sz=8200 hp=true align=8 t=Pointery
         2: integration.go:71:7 "xp3" sz=8200 hp=true align=8 t=Pointery2
         3: integration.go:82:7 "xp4" sz=8200 hp=true align=8 t=Pointery2
         4: integration.go:48:7 "v2" sz=8200 hp=false align=8 t=Vanilla
         5: integration.go:53:7 "v3" sz=8200 hp=false align=8 t=Vanilla2
         6: integration.go:60:6 "s" sz=8192 hp=false align=8 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.65s)

— watchflakes

[gopherbot]

Change https://go.dev/cl/803660 mentions this issue: cmd/compile: for arm32, mark end-of-zero-range pointer as a sink

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/compile/internal/test" && test == "TestMergeLocalsIntegration"

2026-07-21 15:21 gotip-linux-arm go@3ebc1919 cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=4100 hp=true align=4 t=Pointery
         1: integration.go:65:10 "p2" sz=4100 hp=true align=4 t=Pointery
         2: integration.go:71:7 "xp3" sz=4100 hp=true align=4 t=Pointery2
         3: integration.go:82:7 "xp4" sz=4100 hp=true align=4 t=Pointery2
         4: integration.go:48:7 "v2" sz=4100 hp=false align=4 t=Vanilla
         5: integration.go:53:7 "v3" sz=4100 hp=false align=4 t=Vanilla2
         6: integration.go:60:6 "s" sz=4096 hp=false align=4 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.10s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/compile/internal/test" && test == "TestMergeLocalsIntegration"

2026-07-21 15:21 gotip-linux-riscv64 go@3ebc1919 cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=8200 hp=true align=8 t=Pointery
         1: integration.go:65:10 "p2" sz=8200 hp=true align=8 t=Pointery
         2: integration.go:71:7 "xp3" sz=8200 hp=true align=8 t=Pointery2
         3: integration.go:82:7 "xp4" sz=8200 hp=true align=8 t=Pointery2
         4: integration.go:48:7 "v2" sz=8200 hp=false align=8 t=Vanilla
         5: integration.go:53:7 "v3" sz=8200 hp=false align=8 t=Vanilla2
         6: integration.go:60:6 "s" sz=8192 hp=false align=8 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.10s)

— watchflakes

[randall77]

This is happening on arm32, s390x, and riscv64.
The first two are pretty easy fixes. The latter might take a bit more work. riscv64 doesn't have indexed loads&stores, so there's more address arithmetic that is defeating the analysis.

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/compile/internal/test" && test == "TestMergeLocalsIntegration"

2026-07-21 21:24 gotip-linux-arm go@6f82edc1 cmd/compile/internal/test.TestMergeLocalsIntegration (log)

=== RUN   TestMergeLocalsIntegration
    mergelocals_test.go:176: =-= raw cand list for func ABC:
         0: integration.go:65:6 "p1" sz=4100 hp=true align=4 t=Pointery
         1: integration.go:65:10 "p2" sz=4100 hp=true align=4 t=Pointery
         2: integration.go:71:7 "xp3" sz=4100 hp=true align=4 t=Pointery2
         3: integration.go:82:7 "xp4" sz=4100 hp=true align=4 t=Pointery2
         4: integration.go:48:7 "v2" sz=4100 hp=false align=4 t=Vanilla
         5: integration.go:53:7 "v3" sz=4100 hp=false align=4 t=Vanilla2
         6: integration.go:60:6 "s" sz=4096 hp=false align=4 t=Single
        =-= addregion st=0 en=6: add part 0 -> 6
        
    mergelocals_test.go:177: expected trace output on 8 vars got 0
--- FAIL: TestMergeLocalsIntegration (0.19s)

— watchflakes