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60 lines
1.5 KiB
LLVM
60 lines
1.5 KiB
LLVM
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; RUN: llc < %s -march=x86-64 -mtriple=x86_64-linux-gnu -relocation-model=pic | FileCheck %s
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@x = internal thread_local global i32 0, align 4
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@y = internal thread_local global i32 0, align 4
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; get_x and get_y are here to prevent x and y to be optimized away as 0
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define i32* @get_x() {
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entry:
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ret i32* @x
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; FIXME: This function uses a single thread-local variable,
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; so we might want to fall back to general-dynamic here.
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; CHECK: get_x:
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; CHECK: leaq x@TLSLD(%rip), %rdi
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; CHECK-NEXT: callq __tls_get_addr@PLT
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; CHECK: x@DTPOFF
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}
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define i32* @get_y() {
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entry:
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ret i32* @y
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}
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define i32 @f(i32 %i) {
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entry:
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%cmp = icmp eq i32 %i, 1
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br i1 %cmp, label %return, label %if.else
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; This bb does not access TLS, so should not call __tls_get_addr.
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; CHECK: f:
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; CHECK-NOT: __tls_get_addr
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; CHECK: je
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if.else:
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%0 = load i32* @x, align 4
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%cmp1 = icmp eq i32 %i, 2
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br i1 %cmp1, label %if.then2, label %return
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; Now we call __tls_get_addr.
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; CHECK: # %if.else
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; CHECK: leaq x@TLSLD(%rip), %rdi
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; CHECK-NEXT: callq __tls_get_addr@PLT
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; CHECK: x@DTPOFF
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if.then2:
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%1 = load i32* @y, align 4
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%add = add nsw i32 %1, %0
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br label %return
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; This accesses TLS, but is dominated by the previous block,
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; so should not have to call __tls_get_addr again.
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; CHECK: # %if.then2
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; CHECK-NOT: __tls_get_addr
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; CHECK: y@DTPOFF
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return:
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%retval.0 = phi i32 [ %add, %if.then2 ], [ 5, %entry ], [ %0, %if.else ]
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ret i32 %retval.0
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}
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