Revert changes for Linux x86-64

Author: diegorusso

Misc/NEWS.d/next/Core_and_Builtins/2026-04-08-06-59-23.gh-issue-115802.jqfZty.rst

@@ -1 +1 @@
-Improve JIT code generation on Linux targets by reducing the indirect call to external symbols. Patch by Diego Russo.
+Improve JIT code generation on Linux AArch64 by reducing the indirect call to external symbols. Patch by Diego Russo.

Python/jit.c

@@ -316,25 +316,18 @@ patch_32(unsigned char *location, uint64_t value)
     memcpy(location, &final_value, sizeof(final_value));
 }
 
-// 32-bit absolute address, sign-extended by the instruction.
+// 32-bit relative address.
 void
-patch_32s(unsigned char *location, uint64_t value)
+patch_32r(unsigned char *location, uint64_t value)
 {
+    value -= (uintptr_t)location;
     // Check that we're not out of range of 32 signed bits:
     assert((int64_t)value >= -(1LL << 31));
     assert((int64_t)value < (1LL << 31));
-    int32_t final_value = (int32_t)value;
+    uint32_t final_value = (uint32_t)value;
     memcpy(location, &final_value, sizeof(final_value));
 }
 
-// 32-bit relative address.
-void
-patch_32r(unsigned char *location, uint64_t value)
-{
-    value -= (uintptr_t)location;
-    patch_32s(location, value);
-}
-
 // 64-bit absolute address.
 void
 patch_64(unsigned char *location, uint64_t value)

Tools/jit/_stencils.py

@@ -90,7 +90,6 @@ class HoleValue(enum.Enum):
     "R_AARCH64_MOVW_UABS_G2_NC": "patch_aarch64_16c",
     "R_AARCH64_MOVW_UABS_G3": "patch_aarch64_16d",
     # x86_64-unknown-linux-gnu:
-    "R_X86_64_32S": "patch_32s",
     "R_X86_64_64": "patch_64",
     "R_X86_64_GOTPCRELX": "patch_x86_64_32rx",
     "R_X86_64_PLT32": "patch_32r",

Tools/jit/_targets.py

@@ -622,7 +622,7 @@ def get_target(host: str) -> _COFF32 | _COFF64 | _ELF | _MachO:
     elif re.fullmatch(r"x86_64-.*-linux-gnu", host):
         host = "x86_64-unknown-linux-gnu"
         condition = "defined(__x86_64__) && defined(__linux__)"
-        args = ["-fno-pic", "-mcmodel=medium", "-mlarge-data-threshold=0"]
+        args = ["-fno-pic", "-mcmodel=medium", "-mlarge-data-threshold=0", "-fno-plt"]
         optimizer = _optimizers.OptimizerX86
         target = _ELF(
             host, condition, args=args, optimizer=optimizer, frame_pointers=True