From f212dfdbdd645a3ffbf9f0d64fe641f83565d29b Mon Sep 17 00:00:00 2001
From: "Jangra, Ravi" <Ravi.Jangra@amd.com>
Date: Thu, 9 Jul 2026 15:14:19 +0530
Subject: [PATCH] Selective lazy evaluation with targetLength-adaptive gating

Introduce ZSTD_SELECTIVE_LAZY compile-time option to reduce lazy evaluation
overhead in the compression hot path for lazy and lazy2 strategies:

- TargetLength-adaptive match length threshold: skip depth-1/depth-2
  re-search when the initial match is strong (>= 12 bytes for low
  targetLength configurations, >= 16 bytes otherwise), or when the
  match is a repcode or has a short offset (<= 256)
- Repcode early exit at depth-1 and depth-2: bypass expensive searchMax
  when a repcode match is already accepted, since regular matches
  cannot practically beat zero-cost offset encoding

All changes are gated behind ZSTD_SELECTIVE_LAZY. Default build produces
upstream-identical output and passes existing deterministic tests.

Enable with: make ZSTD_SELECTIVE_LAZY=1
---
 build/cmake/CMakeModules/ZstdOptions.cmake    |   7 +
 build/meson/meson.build                       |   5 +
 build/meson/meson_options.txt                 |   2 +
 lib/Makefile                                  |   7 +
 lib/compress/zstd_lazy.c                      |  20 +
 programs/Makefile                             |   4 +
 .../basic.sh.stdout.selective_lazy.exact      | 880 ++++++++++++++++++
 ...multithread.sh.stdout.selective_lazy.exact | 260 ++++++
 tests/cli-tests/determinism/setup_once        |  20 +
 tests/cli-tests/determinism/teardown_once     |  13 +
 10 files changed, 1218 insertions(+)
 create mode 100644 tests/cli-tests/determinism/basic.sh.stdout.selective_lazy.exact
 create mode 100644 tests/cli-tests/determinism/multithread.sh.stdout.selective_lazy.exact
 create mode 100755 tests/cli-tests/determinism/teardown_once

diff --git a/build/cmake/CMakeModules/ZstdOptions.cmake b/build/cmake/CMakeModules/ZstdOptions.cmake
index 3fca543a78e..e7faffe2de3 100644
--- a/build/cmake/CMakeModules/ZstdOptions.cmake
+++ b/build/cmake/CMakeModules/ZstdOptions.cmake
@@ -66,3 +66,10 @@ endif()
 
 # Set global definitions
 add_definitions(-DXXH_NAMESPACE=ZSTD_)
+
+# Selective lazy evaluation optimization
+option(ZSTD_SELECTIVE_LAZY "Enable selective lazy evaluation optimization" OFF)
+if(ZSTD_SELECTIVE_LAZY)
+    message(STATUS "ZSTD_SELECTIVE_LAZY enabled")
+    add_definitions(-DZSTD_SELECTIVE_LAZY)
+endif()
diff --git a/build/meson/meson.build b/build/meson/meson.build
index a9768d43a53..1074923e161 100644
--- a/build/meson/meson.build
+++ b/build/meson/meson.build
@@ -108,6 +108,11 @@ use_lz4 = lz4_dep.found()
 
 add_project_arguments('-DXXH_NAMESPACE=ZSTD_', language: ['c'])
 
+use_selective_lazy = get_option('selective_lazy')
+if use_selective_lazy
+  add_project_arguments('-DZSTD_SELECTIVE_LAZY', language: ['c'])
+endif
+
 pzstd_warning_flags = []
 if [compiler_gcc, compiler_clang].contains(cc_id)
   common_warning_flags = [ '-Wundef', '-Wshadow', '-Wcast-align', '-Wcast-qual' ]
diff --git a/build/meson/meson_options.txt b/build/meson/meson_options.txt
index 4705178279f..de195b64c5a 100644
--- a/build/meson/meson_options.txt
+++ b/build/meson/meson_options.txt
@@ -34,3 +34,5 @@ option('lzma', type: 'feature', value: 'auto',
   description: 'Enable lzma support')
 option('lz4', type: 'feature', value: 'auto',
   description: 'Enable lz4 support')
+option('selective_lazy', type: 'boolean', value: false,
+  description: 'Enable selective lazy evaluation optimization')
diff --git a/lib/Makefile b/lib/Makefile
index 569bd6090c9..de526231d16 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -59,6 +59,13 @@ VERSION := $(ZSTD_VERSION)
 # -mt or -nomt to the build target (like lib-mt for multi-threaded, lib-nomt for single-threaded).
 
 
+# Selective lazy optimization: reduces lazy evaluation overhead for
+# structured binary data workloads with predictable match patterns.
+# Enable with: make ZSTD_SELECTIVE_LAZY=1
+ifdef ZSTD_SELECTIVE_LAZY
+CPPFLAGS += -DZSTD_SELECTIVE_LAZY
+endif
+
 CPPFLAGS_DYNLIB  += -DZSTD_MULTITHREAD # dynamic library build defaults to multi-threaded
 LDFLAGS_DYNLIB   += -pthread
 CPPFLAGS_STATICLIB +=                  # static library build defaults to single-threaded
diff --git a/lib/compress/zstd_lazy.c b/lib/compress/zstd_lazy.c
index 18b7b43948f..94ea66ff176 100644
--- a/lib/compress/zstd_lazy.c
+++ b/lib/compress/zstd_lazy.c
@@ -1669,7 +1669,16 @@ size_t ZSTD_compressBlock_lazy_generic(
         }
 
         /* let's try to find a better solution */
+#ifdef ZSTD_SELECTIVE_LAZY
+        /* Selective lazy: depth-adaptive threshold skips lazy evaluation
+         * for strong matches or nearby offsets. Repcode early exit avoids
+         * expensive searchMax when a repcode match is accepted. */
+        if (depth>=1
+          && matchLength < (ms->cParams.targetLength <= 8 ? 12 : 16)
+          && OFFBASE_IS_OFFSET(offBase) && OFFBASE_TO_OFFSET(offBase) > 256)
+#else
         if (depth>=1)
+#endif
         while (ip<ilimit) {
             DEBUGLOG(7, "search depth 1");
             ip ++;
@@ -1696,6 +1705,13 @@ size_t ZSTD_compressBlock_lazy_generic(
                         matchLength = mlRep, offBase = REPCODE1_TO_OFFBASE, start = ip;
                 }
             }
+#ifdef ZSTD_SELECTIVE_LAZY
+            /* Repcode early exit: if a repcode match was accepted above,
+             * skip the expensive searchMax. A regular match would need to be
+             * 4+ bytes longer to beat a repcode (zero offset encoding cost),
+             * making searchMax very unlikely to improve the result. */
+            if (!OFFBASE_IS_OFFSET(offBase)) break;
+#endif
             {   size_t ofbCandidate=999999999;
                 size_t const ml2 = ZSTD_searchMax(ms, ip, iend, &ofbCandidate, mls, rowLog, searchMethod, dictMode);
                 int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)ofbCandidate));   /* raw approx */
@@ -1732,6 +1748,10 @@ size_t ZSTD_compressBlock_lazy_generic(
                             matchLength = mlRep, offBase = REPCODE1_TO_OFFBASE, start = ip;
                     }
                 }
+#ifdef ZSTD_SELECTIVE_LAZY
+                /* Repcode early exit at depth 2 */
+                if (!OFFBASE_IS_OFFSET(offBase)) break;
+#endif
                 {   size_t ofbCandidate=999999999;
                     size_t const ml2 = ZSTD_searchMax(ms, ip, iend, &ofbCandidate, mls, rowLog, searchMethod, dictMode);
                     int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)ofbCandidate));   /* raw approx */
diff --git a/programs/Makefile b/programs/Makefile
index 94f2179d028..c1eb959e796 100644
--- a/programs/Makefile
+++ b/programs/Makefile
@@ -21,6 +21,10 @@ zstd-release:
 LIBZSTD_MK_DIR = ../lib
 include $(LIBZSTD_MK_DIR)/libzstd.mk
 
+ifdef ZSTD_SELECTIVE_LAZY
+CPPFLAGS += -DZSTD_SELECTIVE_LAZY
+endif
+
 ifeq ($(shell $(CC) -v 2>&1 | $(GREP) -c "gcc version "), 1)
   ALIGN_LOOP = -falign-loops=32
 else
diff --git a/tests/cli-tests/determinism/basic.sh.stdout.selective_lazy.exact b/tests/cli-tests/determinism/basic.sh.stdout.selective_lazy.exact
new file mode 100644
index 00000000000..3483b6f73c0
--- /dev/null
+++ b/tests/cli-tests/determinism/basic.sh.stdout.selective_lazy.exact
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+23c5d58cca20ab65ff8a5d780f09e075
+level 1, long=18, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level 19, long=18, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level 1, long=18, file files/g10000-P10
+6a8f6e75ab538eb08a422febc8b68006
+level 19, long=18, file files/g10000-P10
+cced9c0f5709262da932fc8540bb72f4
+level 1, long=18, file files/g10000-P100
+5db6fbe04a2de772ad4e49f5357d0543
+level 19, long=18, file files/g10000-P100
+049015191cf579b24653c8730fcc10f5
+level 1, long=18, file files/g10000-P25
+6fd603b31365845346faab9cd64fd647
+level 19, long=18, file files/g10000-P25
+6676c9b599408491f7abc00947782054
+level 1, long=18, file files/g10000-P50
+d1de679e9a8c962ed1cc668a96bf930a
+level 19, long=18, file files/g10000-P50
+c61ad9309da86f7229498e46daacd6d9
+level 1, long=18, file files/g10000-P75
+dcf9822423e2ad42a569985707cd5ab4
+level 19, long=18, file files/g10000-P75
+f0ea19930e3866ff7a1932931346e0ac
+level 1, long=18, file files/g10000-P90
+87d249fd8c1ad0064d067a1e5ad97647
+level 19, long=18, file files/g10000-P90
+582e2c4c5a06e452d8dae22e7210c070
+level 1, long=18, file files/g100000
+daa38a869130494c077290cf54f2d895
+level 19, long=18, file files/g100000
+7ae11dc1919d94e80979d41d12a0b578
+level 1, long=18, file files/g1000000
+81b9ffd138f3b25254a7078b06950e5f
+level 19, long=18, file files/g1000000
+db54f06bf3abdbfd57892ab3aad18233
+level 1, long=18, file files/g20000
+1da5b56511e8693867c0cdd962c521aa
+level 19, long=18, file files/g20000
+70028792166e24282f5497592b632192
+level 1, long=18, file files/g200000
+17eb9ff8d912da9c445def85cb748e54
+level 19, long=18, file files/g200000
+ab03b5ab84b6ebe79fa325118a895c6b
+level 1, long=18, file files/g30000
+788bc5abca5e33d79bb79a4eca98b9cd
+level 19, long=18, file files/g30000
+d698feea5119e141a08656439c4c1508
+level 1, long=18, file files/g50000
+0bf9fafd84a2d56a788a9159f1f23f26
+level 19, long=18, file files/g50000
+b81384753f0db76004ac97681f6ef757
+level 1, long=18, file files/g500000
+f035223dc02f581daf5dd79773c4dc2b
+level 19, long=18, file files/g500000
+97093f718faf7b9094e27ea822fd1a29
+level -1, file files/g0
+5d80401e01d33084c65e94f93351e94c
+level -1, file files/g1
+8436b07a7eb916ac9c48af847b7e612f
+level -1, file files/g10
+6cf177a3e6494ac3c76c857df6a9b31d
+level -1, file files/g100
+eb805e7fdb95bc42231b20d0e12e2a53
+level -1, file files/g1000
+ac7c900e31b9e4fe37b7846a898c7d48
+level -1, file files/g10000
+55e1e6ed7fcf5581a17f72f3a32e0834
+level -1, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level -1, file files/g10000-P10
+0bf549bdfc20b644c37901918de0d0eb
+level -1, file files/g10000-P100
+93436482b4da30ce2300d356448c8990
+level -1, file files/g10000-P25
+b65475ee206e480b3adc9fcc7b79c54b
+level -1, file files/g10000-P50
+ae4bf85c8343052ecb1d666bd9766fbc
+level -1, file files/g10000-P75
+b0674333f519e71708f226f935ae63d5
+level -1, file files/g10000-P90
+2daa80aa34a8259fed7e04ae41397d6c
+level -1, file files/g100000
+586e12a3aa574f35aedf0afadee3040c
+level -1, file files/g1000000
+1cc8eb9ee1e4c20373fe3c1b0aa1a982
+level -1, file files/g20000
+b220e6387b1f5036c203f8be5f1a571c
+level -1, file files/g200000
+fc42db710c19a4f4a27f004fb4678d9c
+level -1, file files/g30000
+5350a7346d815f4ad42216b91ba8749a
+level -1, file files/g50000
+4f00a5a94e8f98c6972053057f6ac971
+level -1, file files/g500000
+4abb2e46c936c273955778c00f3eb492
diff --git a/tests/cli-tests/determinism/multithread.sh.stdout.selective_lazy.exact b/tests/cli-tests/determinism/multithread.sh.stdout.selective_lazy.exact
new file mode 100644
index 00000000000..1f286511f8c
--- /dev/null
+++ b/tests/cli-tests/determinism/multithread.sh.stdout.selective_lazy.exact
@@ -0,0 +1,260 @@
+level 1, file files/g0
+5d80401e01d33084c65e94f93351e94c
+level 1, file files/g1
+8436b07a7eb916ac9c48af847b7e612f
+level 1, file files/g10
+6cf177a3e6494ac3c76c857df6a9b31d
+level 1, file files/g100
+c94d1ef6bbec8b4899486b06207ee829
+level 1, file files/g1000
+6bf2f4b179864fd8db4676037465feed
+level 1, file files/g10000
+2ae44c4053b2b47724c8f612dfb60d24
+level 1, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level 1, file files/g10000-P10
+2d0eeab6a966098583a1dfeafb5090c1
+level 1, file files/g10000-P100
+93436482b4da30ce2300d356448c8990
+level 1, file files/g10000-P25
+c64b5f512c44b6a647da81753791b9a7
+level 1, file files/g10000-P50
+3982325490d90c8307e734c1b25790df
+level 1, file files/g10000-P75
+b7504f80fee16b5ba6a0f46571eb563a
+level 1, file files/g10000-P90
+350892bec7f7ad6a7d6af01c5d8b07c7
+level 1, file files/g100000
+daa38a869130494c077290cf54f2d895
+level 1, file files/g1000000
+a1d548531221d408b95dc5d9c600b3f0
+level 1, file files/g20000
+1da5b56511e8693867c0cdd962c521aa
+level 1, file files/g200000
+41fb3b3d46d4221f2f0b072c65dd6e0a
+level 1, file files/g30000
+788bc5abca5e33d79bb79a4eca98b9cd
+level 1, file files/g50000
+0bf9fafd84a2d56a788a9159f1f23f26
+level 1, file files/g500000
+73401d6df0657e091de20468f32579a9
+level 3, file files/g0
+5d80401e01d33084c65e94f93351e94c
+level 3, file files/g1
+8436b07a7eb916ac9c48af847b7e612f
+level 3, file files/g10
+6cf177a3e6494ac3c76c857df6a9b31d
+level 3, file files/g100
+c94d1ef6bbec8b4899486b06207ee829
+level 3, file files/g1000
+3ec47dcb2d606b9fdef3f19b1304f8fe
+level 3, file files/g10000
+69a9d518b84fe2a66b57dfb4ab8905ae
+level 3, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level 3, file files/g10000-P10
+ac9866ac355c4ed8939deb9fbeec1aef
+level 3, file files/g10000-P100
+93436482b4da30ce2300d356448c8990
+level 3, file files/g10000-P25
+5e1fe7a3831f6632bc8c9873ab8b633d
+level 3, file files/g10000-P50
+76295f181396a98565eb9cc69b96dc75
+level 3, file files/g10000-P75
+1f751dc70508e81fef197311e8583e99
+level 3, file files/g10000-P90
+47c7b061c299dc253c6aaaf489e936cb
+level 3, file files/g100000
+4b30b2be3394f03f1cf1f37a08dcec12
+level 3, file files/g1000000
+4301dea72cc4dd6162e46caa59788a09
+level 3, file files/g20000
+30456361833d27c0962c2faaa254e615
+level 3, file files/g200000
+0f01c07c57d60298dd54c6b6b197c3d3
+level 3, file files/g30000
+0b3c506a1b1b6ccbb54a852c370f5cdc
+level 3, file files/g50000
+81368c0b96bf1a2f318940b836b46074
+level 3, file files/g500000
+0c1ef9c6d3d75bfa0dd5d893f65da47c
+level 7, file files/g0
+5d80401e01d33084c65e94f93351e94c
+level 7, file files/g1
+8436b07a7eb916ac9c48af847b7e612f
+level 7, file files/g10
+6cf177a3e6494ac3c76c857df6a9b31d
+level 7, file files/g100
+c94d1ef6bbec8b4899486b06207ee829
+level 7, file files/g1000
+c936d4e4e394a4f624547e69a052301d
+level 7, file files/g10000
+63cf34f755e23eabfb214dfd87d34c85
+level 7, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level 7, file files/g10000-P10
+32e7f626a7b315b1ee8a548da7a6611f
+level 7, file files/g10000-P100
+15fede9faa3d7c484dead66071fb8c5d
+level 7, file files/g10000-P25
+c0a9bc6c746587c554761b8ba7410a09
+level 7, file files/g10000-P50
+b3a2130316b64b97e5cacfe6b6ebdd28
+level 7, file files/g10000-P75
+78e5eda414fac7408a21501caf8a5f95
+level 7, file files/g10000-P90
+62526857508e6808a0d703d05c3f9ae4
+level 7, file files/g100000
+dd729d4afa0d85fcd5325806a115cfac
+level 7, file files/g1000000
+45a44f60d23023c5a4b964966dad1c10
+level 7, file files/g20000
+6b9deb71254d04556baf95bdb7ad2925
+level 7, file files/g200000
+f57a51e3d9f1c7e95d34933eb696a8f6
+level 7, file files/g30000
+ba35a0d86f89d8730a3dde12d7973041
+level 7, file files/g50000
+a60b5f9ba139a98ba6969c443373e6cd
+level 7, file files/g500000
+bfb0345078043d40cfe3b84c7e664b93
+level 19, file files/g0
+5d80401e01d33084c65e94f93351e94c
+level 19, file files/g1
+8436b07a7eb916ac9c48af847b7e612f
+level 19, file files/g10
+6cf177a3e6494ac3c76c857df6a9b31d
+level 19, file files/g100
+e6e88e42b891fbc82c87a60928d88e97
+level 19, file files/g1000
+f3eeeae11e293292fe1810d8745d0ae1
+level 19, file files/g10000
+23c5d58cca20ab65ff8a5d780f09e075
+level 19, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level 19, file files/g10000-P10
+cced9c0f5709262da932fc8540bb72f4
+level 19, file files/g10000-P100
+049015191cf579b24653c8730fcc10f5
+level 19, file files/g10000-P25
+6676c9b599408491f7abc00947782054
+level 19, file files/g10000-P50
+c61ad9309da86f7229498e46daacd6d9
+level 19, file files/g10000-P75
+d3171f297dfd08e444d481b30b1bbefa
+level 19, file files/g10000-P90
+87c4a59ec6e15f6da86b26969044a8a4
+level 19, file files/g100000
+7ae11dc1919d94e80979d41d12a0b578
+level 19, file files/g1000000
+d4b9ee8879d7f30bed3ec9e70520ca67
+level 19, file files/g20000
+70028792166e24282f5497592b632192
+level 19, file files/g200000
+ab03b5ab84b6ebe79fa325118a895c6b
+level 19, file files/g30000
+d698feea5119e141a08656439c4c1508
+level 19, file files/g50000
+b81384753f0db76004ac97681f6ef757
+level 19, file files/g500000
+0a25ba39483255a2c16899ab80a3ed8f
+level 1, long=18, file files/g0
+5d80401e01d33084c65e94f93351e94c
+level 19, long=18, file files/g0
+5d80401e01d33084c65e94f93351e94c
+level 1, long=18, file files/g1
+8436b07a7eb916ac9c48af847b7e612f
+level 19, long=18, file files/g1
+8436b07a7eb916ac9c48af847b7e612f
+level 1, long=18, file files/g10
+6cf177a3e6494ac3c76c857df6a9b31d
+level 19, long=18, file files/g10
+6cf177a3e6494ac3c76c857df6a9b31d
+level 1, long=18, file files/g100
+c94d1ef6bbec8b4899486b06207ee829
+level 19, long=18, file files/g100
+e6e88e42b891fbc82c87a60928d88e97
+level 1, long=18, file files/g1000
+6bf2f4b179864fd8db4676037465feed
+level 19, long=18, file files/g1000
+f3eeeae11e293292fe1810d8745d0ae1
+level 1, long=18, file files/g10000
+2ae44c4053b2b47724c8f612dfb60d24
+level 19, long=18, file files/g10000
+23c5d58cca20ab65ff8a5d780f09e075
+level 1, long=18, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level 19, long=18, file files/g10000-P0
+6c2641d3b83775c50b766793b39967c4
+level 1, long=18, file files/g10000-P10
+6a8f6e75ab538eb08a422febc8b68006
+level 19, long=18, file files/g10000-P10
+cced9c0f5709262da932fc8540bb72f4
+level 1, long=18, file files/g10000-P100
+5db6fbe04a2de772ad4e49f5357d0543
+level 19, long=18, file files/g10000-P100
+049015191cf579b24653c8730fcc10f5
+level 1, long=18, file files/g10000-P25
+6fd603b31365845346faab9cd64fd647
+level 19, long=18, file files/g10000-P25
+6676c9b599408491f7abc00947782054
+level 1, long=18, file files/g10000-P50
+d1de679e9a8c962ed1cc668a96bf930a
+level 19, long=18, file files/g10000-P50
+c61ad9309da86f7229498e46daacd6d9
+level 1, long=18, file files/g10000-P75
+dcf9822423e2ad42a569985707cd5ab4
+level 19, long=18, file files/g10000-P75
+f0ea19930e3866ff7a1932931346e0ac
+level 1, long=18, file files/g10000-P90
+87d249fd8c1ad0064d067a1e5ad97647
+level 19, long=18, file files/g10000-P90
+582e2c4c5a06e452d8dae22e7210c070
+level 1, long=18, file files/g100000
+daa38a869130494c077290cf54f2d895
+level 19, long=18, file files/g100000
+7ae11dc1919d94e80979d41d12a0b578
+level 1, long=18, file files/g1000000
+2c410773bb02367d20d20569393faf1e
+level 19, long=18, file files/g1000000
+e3f5ef0204aedbac03e80d4300b3afc7
+level 1, long=18, file files/g20000
+1da5b56511e8693867c0cdd962c521aa
+level 19, long=18, file files/g20000
+70028792166e24282f5497592b632192
+level 1, long=18, file files/g200000
+17eb9ff8d912da9c445def85cb748e54
+level 19, long=18, file files/g200000
+ab03b5ab84b6ebe79fa325118a895c6b
+level 1, long=18, file files/g30000
+788bc5abca5e33d79bb79a4eca98b9cd
+level 19, long=18, file files/g30000
+d698feea5119e141a08656439c4c1508
+level 1, long=18, file files/g50000
+0bf9fafd84a2d56a788a9159f1f23f26
+level 19, long=18, file files/g50000
+b81384753f0db76004ac97681f6ef757
+level 1, long=18, file files/g500000
+f035223dc02f581daf5dd79773c4dc2b
+level 19, long=18, file files/g500000
+97093f718faf7b9094e27ea822fd1a29
+Vary number of threads on files/g0
+Vary number of threads on files/g1
+Vary number of threads on files/g10
+Vary number of threads on files/g100
+Vary number of threads on files/g1000
+Vary number of threads on files/g10000
+Vary number of threads on files/g10000-P0
+Vary number of threads on files/g10000-P10
+Vary number of threads on files/g10000-P100
+Vary number of threads on files/g10000-P25
+Vary number of threads on files/g10000-P50
+Vary number of threads on files/g10000-P75
+Vary number of threads on files/g10000-P90
+Vary number of threads on files/g100000
+Vary number of threads on files/g1000000
+Vary number of threads on files/g20000
+Vary number of threads on files/g200000
+Vary number of threads on files/g30000
+Vary number of threads on files/g50000
+Vary number of threads on files/g500000
diff --git a/tests/cli-tests/determinism/setup_once b/tests/cli-tests/determinism/setup_once
index 1d7b34c1fd1..40b6a82fe2d 100755
--- a/tests/cli-tests/determinism/setup_once
+++ b/tests/cli-tests/determinism/setup_once
@@ -28,3 +28,23 @@ datagen -g10000 -P50 > files/g10000-P50
 datagen -g10000 -P75 > files/g10000-P75
 datagen -g10000 -P90 > files/g10000-P90
 datagen -g10000 -P100 > files/g10000-P100
+
+# Detect ZSTD_SELECTIVE_LAZY build and swap in matching test expectations.
+# g10000 at L6 reliably differs between dev and selective-lazy builds.
+_sl_file="$CLI_TESTS/determinism/basic.sh.stdout.selective_lazy.exact"
+if [ -f "$_sl_file" ]; then
+    _actual=$(zstd --single-thread -q -6 files/g10000 -c | md5hash)
+    _sl_hash=$(grep -A1 '^level 6, file files/g10000$' "$_sl_file" | tail -1)
+    if [ "$_actual" = "$_sl_hash" ]; then
+        # Back up originals so teardown_once can restore them.
+        cp "$CLI_TESTS/determinism/basic.sh.stdout.exact" \
+           "$CLI_TESTS/determinism/basic.sh.stdout.exact.bak"
+        cp "$CLI_TESTS/determinism/multithread.sh.stdout.exact" \
+           "$CLI_TESTS/determinism/multithread.sh.stdout.exact.bak"
+        # Swap in selective-lazy expectations.
+        cp "$_sl_file" "$CLI_TESTS/determinism/basic.sh.stdout.exact"
+        [ -f "$CLI_TESTS/determinism/multithread.sh.stdout.selective_lazy.exact" ] && \
+            cp "$CLI_TESTS/determinism/multithread.sh.stdout.selective_lazy.exact" \
+               "$CLI_TESTS/determinism/multithread.sh.stdout.exact"
+    fi
+fi
diff --git a/tests/cli-tests/determinism/teardown_once b/tests/cli-tests/determinism/teardown_once
new file mode 100755
index 00000000000..a00364fefe4
--- /dev/null
+++ b/tests/cli-tests/determinism/teardown_once
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# Restore original test expectations if they were swapped for
+# a ZSTD_SELECTIVE_LAZY build during setup_once.
+
+_det_dir="$CLI_TESTS/determinism"
+
+for f in basic.sh.stdout.exact multithread.sh.stdout.exact; do
+    if [ -f "$_det_dir/$f.bak" ]; then
+        cp "$_det_dir/$f.bak" "$_det_dir/$f"
+        rm "$_det_dir/$f.bak"
+    fi
+done