[lld] [lld][LoongArch] Relax TLSDESC code sequence (PR #123677)
Lu Weining via llvm-commits
llvm-commits at lists.llvm.org
Thu Mar 20 01:29:18 PDT 2025
================
@@ -0,0 +1,280 @@
+# REQUIRES: loongarch
+# RUN: rm -rf %t && split-file %s %t && cd %t
+# RUN: llvm-mc -filetype=obj -triple=loongarch64 -mattr=+relax a.s -o a.64.o
+# RUN: llvm-mc -filetype=obj -triple=loongarch64 -mattr=+relax c.s -o c.64.o
+# RUN: ld.lld --relax -shared -soname=c.64.so c.64.o -o c.64.so
+
+## Test the TLSDESC relaxation.
+# RUN: ld.lld --relax -shared -z now a.64.o c.64.o -o a.64.so
+# RUN: llvm-readobj -r -x .got a.64.so | FileCheck --check-prefix=GD64-RELA %s
+# RUN: llvm-objdump --no-show-raw-insn -dr -h a.64.so | FileCheck %s --check-prefix=GD64
+
+## FIXME: The transition frome TLSDESC to IE/LE has not yet been implemented.
+## Keep the dynamic relocations and hand them over to dynamic linker.
+
+# RUN: ld.lld --relax -e 0 -z now a.64.o c.64.o -o a.64.le
+# RUN: llvm-readobj -r -x .got a.64.le | FileCheck --check-prefix=LE64-RELA %s
+# RUN: llvm-objdump --no-show-raw-insn -d -h a.64.le | FileCheck %s --check-prefix=LE64
+
+# RUN: ld.lld --no-relax -e 0 -z now a.64.o c.64.o -o a.64.le.norelax
+# RUN: llvm-objdump --no-show-raw-insn -d -h a.64.le.norelax | FileCheck %s --check-prefix=LE64-NORELAX
+
+# RUN: ld.lld --relax -e 0 -z now a.64.o c.64.so -o a.64.ie
+# RUN: llvm-readobj -r -x .got a.64.ie | FileCheck --check-prefix=IE64-RELA %s
+# RUN: llvm-objdump --no-show-raw-insn -d -h a.64.ie | FileCheck %s --check-prefix=IE64
+
+# RUN: ld.lld --no-relax -e 0 -z now a.64.o c.64.so -o a.64.ie.norelax
+# RUN: llvm-objdump --no-show-raw-insn -d -h a.64.ie.norelax | FileCheck %s --check-prefix=IE64-NORELAX
+
+# GD64-RELA: .rela.dyn {
+# GD64-RELA-NEXT: 0x20460 R_LARCH_TLS_DESC64 - 0x7FF
+# GD64-RELA-NEXT: 0x20430 R_LARCH_TLS_DESC64 a 0x0
+# GD64-RELA-NEXT: 0x20440 R_LARCH_TLS_DESC64 c 0x0
+# GD64-RELA-NEXT: 0x20450 R_LARCH_TLS_DESC64 d 0x0
+# GD64-RELA-NEXT: }
+# GD64-RELA: Hex dump of section '.got':
+# GD64-RELA-NEXT: 0x00020430 00000000 00000000 00000000 00000000 .
+# GD64-RELA-NEXT: 0x00020440 00000000 00000000 00000000 00000000 .
+# GD64-RELA-NEXT: 0x00020450 00000000 00000000 00000000 00000000 .
+# GD64-RELA-NEXT: 0x00020460 00000000 00000000 00000000 00000000 .
+
+# GD64: .got 00000040 0000000000020430
+
+## &.got[a]-. = 0x20430 - 0x10318 = 16454<<2
+# GD64: 10318: pcaddi $a0, 16454
+# GD64-NEXT: ld.d $ra, $a0, 0
+# GD64-NEXT: jirl $ra, $ra, 0
+# GD64-NEXT: add.d $a1, $a0, $tp
+
+## &.got[b]-. = 0x20430+48 - 0x10328: 0x10 pages, page offset 0x460
+## R_LARCH_RELAX does not appear in pairs. No relaxation.
+# GD64: 10328: pcalau12i $a0, 16
+# GD64-NEXT: addi.d $a0, $a0, 1120
+# GD64-NEXT: ld.d $ra, $a0, 0
+# GD64-NEXT: jirl $ra, $ra, 0
+# GD64-NEXT: add.d $a2, $a0, $tp
+
+## &.got[c]-. = 0x20430+16 - 0x1033c: 0x10 pages, page offset 0x440
+## Without R_LARCH_RELAX relocation. No relaxation.
+# GD64: 1033c: pcalau12i $a0, 16
+# GD64-NEXT: addi.d $t0, $zero, 0
+# GD64-NEXT: addi.d $a0, $a0, 1088
+# GD64-NEXT: addi.d $t0, $t0, 1
+# GD64-NEXT: ld.d $ra, $a0, 0
+# GD64-NEXT: addi.d $t0, $t0, 1
+# GD64-NEXT: jirl $ra, $ra, 0
+# GD64-NEXT: add.d $a3, $a0, $tp
+
+## &.got[d]-. = 0x20430+32 - 0x1035c = 16445<<2
+# GD64: 1035c: pcaddi $a0, 16445
+# GD64-NEXT: ld.d $ra, $a0, 0
+# GD64-NEXT: jirl $ra, $ra, 0
+# GD64-NEXT: add.d $a4, $a0, $tp
+
+# LE64-RELA: .rela.dyn {
+# LE64-RELA-NEXT: 0x30280 R_LARCH_TLS_DESC64 - 0x8
+# LE64-RELA-NEXT: 0x30290 R_LARCH_TLS_DESC64 - 0x800
+# LE64-RELA-NEXT: 0x302A0 R_LARCH_TLS_DESC64 - 0x1000
+# LE64-RELA-NEXT: 0x302B0 R_LARCH_TLS_DESC64 - 0x7FF
+# LE64-RELA-NEXT: }
+# LE64-RELA: Hex dump of section '.got':
+# LE64-RELA-NEXT: 0x00030280 00000000 00000000 00000000 00000000 .
+# LE64-RELA-NEXT: 0x00030290 00000000 00000000 00000000 00000000 .
+# LE64-RELA-NEXT: 0x000302a0 00000000 00000000 00000000 00000000 .
+# LE64-RELA-NEXT: 0x000302b0 00000000 00000000 00000000 00000000 .
+
+# LE64: .got 00000040 0000000000030280
+
+## &.got[a]-. = 0x30280 - 0x20228 = 16406<<2
+# LE64: 20228: pcaddi $a0, 16406
+# LE64-NEXT: ld.d $ra, $a0, 0
+# LE64-NEXT: jirl $ra, $ra, 0
+# LE64-NEXT: add.d $a1, $a0, $tp
+
+## &.got[b]-. = 0x30280+48 - 0x20238: 0x10 pages, page offset 0x2b0
+## R_LARCH_RELAX does not appear in pairs. No relaxation.
+# LE64: 20238: pcalau12i $a0, 16
+# LE64-NEXT: addi.d $a0, $a0, 688
+# LE64-NEXT: ld.d $ra, $a0, 0
+# LE64-NEXT: jirl $ra, $ra, 0
+# LE64-NEXT: add.d $a2, $a0, $tp
+
+## &.got[c]-. = 0x30280+16 - 0x2024c: 0x10 pages, page offset 0x290
+## Without R_LARCH_RELAX relocation. No relaxation.
+# LE64: 2024c: pcalau12i $a0, 16
+# LE64-NEXT: addi.d $t0, $zero, 0
+# LE64-NEXT: addi.d $a0, $a0, 656
+# LE64-NEXT: addi.d $t0, $t0, 1
+# LE64-NEXT: ld.d $ra, $a0, 0
+# LE64-NEXT: addi.d $t0, $t0, 1
+# LE64-NEXT: jirl $ra, $ra, 0
+# LE64-NEXT: add.d $a3, $a0, $tp
+
+## &.got[d]-. = 0x30280+32 - 0x2026c = 16397<<2
+# LE64: 2026c: pcaddi $a0, 16397
+# LE64-NEXT: ld.d $ra, $a0, 0
+# LE64-NEXT: jirl $ra, $ra, 0
+# LE64-NEXT: add.d $a4, $a0, $tp
+
+# LE64-NORELAX: .got 00000040 0000000000030288
+
+## &.got[a]-. = 0x30288 - 0x20228 = 0x10 pages, page offset 0x288
+# LE64-NORELAX: 20228: pcalau12i $a0, 16
+# LE64-NORELAX-NEXT: addi.d $a0, $a0, 648
+# LE64-NORELAX-NEXT: ld.d $ra, $a0, 0
+# LE64-NORELAX-NEXT: jirl $ra, $ra, 0
+# LE64-NORELAX-NEXT: add.d $a1, $a0, $tp
+
+## &.got[b]-. = 0x30288+48 - 0x2023c: 0x10 pages, page offset 0x2b8
+## R_LARCH_RELAX does not appear in pairs. No relaxation.
+# LE64-NORELAX: 2023c: pcalau12i $a0, 16
+# LE64-NORELAX-NEXT: addi.d $a0, $a0, 696
+# LE64-NORELAX-NEXT: ld.d $ra, $a0, 0
+# LE64-NORELAX-NEXT: jirl $ra, $ra, 0
+# LE64-NORELAX-NEXT: add.d $a2, $a0, $tp
+
+## &.got[c]-. = 0x30288+16 - 0x20250: 0x10 pages, page offset 0x298
+## Without R_LARCH_RELAX relocation. No relaxation.
+# LE64-NORELAX: 20250: pcalau12i $a0, 16
+# LE64-NORELAX-NEXT: addi.d $t0, $zero, 0
+# LE64-NORELAX-NEXT: addi.d $a0, $a0, 664
+# LE64-NORELAX-NEXT: addi.d $t0, $t0, 1
+# LE64-NORELAX-NEXT: ld.d $ra, $a0, 0
+# LE64-NORELAX-NEXT: addi.d $t0, $t0, 1
+# LE64-NORELAX-NEXT: jirl $ra, $ra, 0
+# LE64-NORELAX-NEXT: add.d $a3, $a0, $tp
+
+## &.got[d]-. = 0x30288+32 - 0x20270: 0x10 pages, page offset 0x2a8
+# LE64-NORELAX: 20270: pcalau12i $a0, 16
+# LE64-NORELAX-NEXT: addi.d $a0, $a0, 680
+# LE64-NORELAX-NEXT: ld.d $ra, $a0, 0
+# LE64-NORELAX-NEXT: jirl $ra, $ra, 0
+# LE64-NORELAX-NEXT: add.d $a4, $a0, $tp
+
+# IE64-RELA: .rela.dyn {
+# IE64-RELA-NEXT: 0x30430 R_LARCH_TLS_DESC64 - 0x8
+# IE64-RELA-NEXT: 0x30460 R_LARCH_TLS_DESC64 - 0x7FF
+# IE64-RELA-NEXT: 0x30440 R_LARCH_TLS_DESC64 c 0x0
+# IE64-RELA-NEXT: 0x30450 R_LARCH_TLS_DESC64 d 0x0
+# IE64-RELA-NEXT: }
+# IE64-RELA: Hex dump of section '.got':
+# IE64-RELA-NEXT: 0x00030430 00000000 00000000 00000000 00000000 .
+# IE64-RELA-NEXT: 0x00030440 00000000 00000000 00000000 00000000 .
+# IE64-RELA-NEXT: 0x00030450 00000000 00000000 00000000 00000000 .
+# IE64-RELA-NEXT: 0x00030460 00000000 00000000 00000000 00000000 .
+
+# IE64: .got 00000040 0000000000030430
+
+## a and b are optimized to use LE. c and d are optimized to IE.
+## &.got[a]-. = 0x30430 - 0x202f8 = 16462<<2
+# IE64: 202f8: pcaddi $a0, 16462
+# IE64-NEXT: ld.d $ra, $a0, 0
+# IE64-NEXT: jirl $ra, $ra, 0
+# IE64-NEXT: add.d $a1, $a0, $tp
+
+## &.got[b]-. = 0x30430+48 - 0x20308: 0x10 pages, page offset 0x460
+## R_LARCH_RELAX does not appear in pairs. No relaxation.
+# IE64: 20308: pcalau12i $a0, 16
+# IE64-NEXT: addi.d $a0, $a0, 1120
+# IE64-NEXT: ld.d $ra, $a0, 0
+# IE64-NEXT: jirl $ra, $ra, 0
+# IE64-NEXT: add.d $a2, $a0, $tp
+
+## &.got[c]-. = 0x30430+16 - 0x2031c: 0x10 pages, page offset 0x440
+## Without R_LARCH_RELAX relocation. No relaxation.
+# IE64: 2031c: pcalau12i $a0, 16
+# IE64-NEXT: addi.d $t0, $zero, 0
+# IE64-NEXT: addi.d $a0, $a0, 1088
+# IE64-NEXT: addi.d $t0, $t0, 1
+# IE64-NEXT: ld.d $ra, $a0, 0
+# IE64-NEXT: addi.d $t0, $t0, 1
+# IE64-NEXT: jirl $ra, $ra, 0
+# IE64-NEXT: add.d $a3, $a0, $tp
+
+## &.got[d]-. = 0x30430+32 - 0x2033c = 16453<<2
+# IE64: 2033c: pcaddi $a0, 16453
+# IE64-NEXT: ld.d $ra, $a0, 0
+# IE64-NEXT: jirl $ra, $ra, 0
+# IE64-NEXT: add.d $a4, $a0, $tp
+
+# IE64-NORELAX: .got 00000040 0000000000030438
+
+## &.got[a]-. = 0x30438 - 0x202f8 = 0x10 pages, page offset 0x438
+# IE64-NORELAX: 202f8: pcalau12i $a0, 16
+# IE64-NORELAX-NEXT: addi.d $a0, $a0, 1080
+# IE64-NORELAX-NEXT: ld.d $ra, $a0, 0
+# IE64-NORELAX-NEXT: jirl $ra, $ra, 0
+# IE64-NORELAX-NEXT: add.d $a1, $a0, $tp
+
+## &.got[b]-. = 0x30438+48 - 0x2030c: 0x10 pages, page offset 0x468
+## R_LARCH_RELAX does not appear in pairs. No relaxation.
+# IE64-NORELAX: 2030c: pcalau12i $a0, 16
+# IE64-NORELAX-NEXT: addi.d $a0, $a0, 1128
+# IE64-NORELAX-NEXT: ld.d $ra, $a0, 0
+# IE64-NORELAX-NEXT: jirl $ra, $ra, 0
+# IE64-NORELAX-NEXT: add.d $a2, $a0, $tp
+
+## &.got[c]-. = 0x30438+16 - 0x20320: 0x10 pages, page offset 0x448
+## Without R_LARCH_RELAX relocation. No relaxation.
+# IE64-NORELAX: 20320: pcalau12i $a0, 16
+# IE64-NORELAX-NEXT: addi.d $t0, $zero, 0
+# IE64-NORELAX-NEXT: addi.d $a0, $a0, 1096
+# IE64-NORELAX-NEXT: addi.d $t0, $t0, 1
+# IE64-NORELAX-NEXT: ld.d $ra, $a0, 0
+# IE64-NORELAX-NEXT: addi.d $t0, $t0, 1
+# IE64-NORELAX-NEXT: jirl $ra, $ra, 0
+# IE64-NORELAX-NEXT: add.d $a3, $a0, $tp
+
+## &.got[d]-. = 0x30438+32 - 0x20340: 0x10 pages, page offset 0x458
+# IE64-NORELAX: 20340: pcalau12i $a0, 16
+# IE64-NORELAX-NEXT: addi.d $a0, $a0, 1112
+# IE64-NORELAX-NEXT: ld.d $ra, $a0, 0
+# IE64-NORELAX-NEXT: jirl $ra, $ra, 0
+# IE64-NORELAX-NEXT: add.d $a4, $a0, $tp
+
+#--- a.s
+la.tls.desc $a0, a
+add.d $a1, $a0, $tp
+
+# ADDI.D does not have R_LARCH_RELAX. No relaxation.
+pcalau12i $a0, %desc_pc_hi20(b)
+.reloc .-4, R_LARCH_RELAX, 0
+addi.d $a0, $a0, %desc_pc_lo12(b)
+ld.d $ra, $a0, %desc_ld(b)
+jirl $ra, $ra, %desc_call(b)
+add.d $a2, $a0, $tp
+
+# TLSDESC to LE. No relaxation.
+pcalau12i $a0, %desc_pc_hi20(c)
+addi.d $t0, $zero, 0
+addi.d $a0, $a0, %desc_pc_lo12(c)
+addi.d $t0, $t0, 1
+ld.d $ra, $a0, %desc_ld(c)
+addi.d $t0, $t0, 1
+jirl $ra, $ra, %desc_call(c)
+add.d $a3, $a0, $tp
+
+# PCALAU12I and ADDI.D have R_LARCH_RELAX. We preform relaxation.
----------------
SixWeining wrote:
```suggestion
# PCALAU12I and ADDI.D have R_LARCH_RELAX. We perform relaxation.
```
https://github.com/llvm/llvm-project/pull/123677
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