c0214db51a
For mingw target, if a symbol is not marked DSO local, a `.refptr` is generated for it. This makes CFG check calls use an extra pointer dereference, which adds extra overhead compared to the MSVC version, so mark the CFG guard check funciton pointer DSO local to stop it. This should have no effect on MSVC target. Also adapt the existing cfguard tests to run for mingw targets, so that this change is checked. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D132331
37 lines
906 B
LLVM
37 lines
906 B
LLVM
; RUN: llc < %s -mtriple=x86_64-pc-windows-msvc | FileCheck %s
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; RUN: llc < %s -mtriple=x86_64-w64-windows-gnu | FileCheck %s
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; Check how constant function pointer casts are handled.
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declare void @unprototyped(...)
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define i32 @call_unprototyped() {
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call void bitcast (void (...)* @unprototyped to void ()*)()
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ret i32 0
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}
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; CHECK-LABEL: call_unprototyped:
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; CHECK: callq unprototyped
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; CHECK: xorl %eax, %eax
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; CHECK: retq
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declare void @escaped_cast()
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define i32 @escape_it_with_cast(i8** %p) {
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store i8* bitcast (void ()* @escaped_cast to i8*), i8** %p
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ret i32 0
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}
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declare void @dead_constant()
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"cfguard", i32 1}
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!dead_constant_root = !{!1}
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!1 = !DITemplateValueParameter(name: "dead_constant", value: i8* bitcast (void ()* @dead_constant to i8*))
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; CHECK-LABEL: .section .gfids$y,"dr"
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; CHECK-NEXT: .symidx escaped_cast
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; CHECK-NOT: .symidx
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