2019-09-05 03:50:39 +08:00
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; RUN: llc -mattr=+bulk-memory,+atomics -filetype=obj %s -o %t.o
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[WebAssembly] Compute and export TLS block alignment
Summary:
Add immutable WASM global `__tls_align` which stores the alignment
requirements of the TLS segment.
Add `__builtin_wasm_tls_align()` intrinsic to get this alignment in Clang.
The expected usage has now changed to:
__wasm_init_tls(memalign(__builtin_wasm_tls_align(),
__builtin_wasm_tls_size()));
Reviewers: tlively, aheejin, sbc100, sunfish, alexcrichton
Reviewed By: tlively
Subscribers: dschuff, jgravelle-google, hiraditya, cfe-commits, llvm-commits
Tags: #clang, #llvm
Differential Revision: https://reviews.llvm.org/D65028
llvm-svn: 366624
2019-07-20 07:34:16 +08:00
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target triple = "wasm32-unknown-unknown"
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@no_tls = global i32 0, align 4
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@tls1 = thread_local(localexec) global i32 1, align 4
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@tls2 = thread_local(localexec) global i32 1, align 16
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define i32* @tls1_addr() {
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ret i32* @tls1
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}
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define i32* @tls2_addr() {
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ret i32* @tls2
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}
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; RUN: wasm-ld -no-gc-sections --shared-memory --max-memory=131072 --no-entry -o %t.wasm %t.o
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; RUN: obj2yaml %t.wasm | FileCheck %s
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; CHECK: - Type: GLOBAL
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; CHECK-NEXT: Globals:
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; CHECK-NEXT: - Index: 0
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; CHECK-NEXT: Type: I32
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; CHECK-NEXT: Mutable: true
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; CHECK-NEXT: InitExpr:
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; CHECK-NEXT: Opcode: I32_CONST
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; CHECK-NEXT: Value: 66608
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; __tls_base
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; CHECK-NEXT: - Index: 1
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; CHECK-NEXT: Type: I32
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; CHECK-NEXT: Mutable: true
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; CHECK-NEXT: InitExpr:
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; CHECK-NEXT: Opcode: I32_CONST
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; CHECK-NEXT: Value: 0
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; __tls_size
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; CHECK-NEXT: - Index: 2
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; CHECK-NEXT: Type: I32
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; CHECK-NEXT: Mutable: false
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; CHECK-NEXT: InitExpr:
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; CHECK-NEXT: Opcode: I32_CONST
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; CHECK-NEXT: Value: 20
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; __tls_align
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; CHECK-NEXT: - Index: 3
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; CHECK-NEXT: Type: I32
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; CHECK-NEXT: Mutable: false
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; CHECK-NEXT: InitExpr:
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; CHECK-NEXT: Opcode: I32_CONST
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; CHECK-NEXT: Value: 16
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