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llvm-project/llvm/test/CodeGen/X86/tail-call-win64.ll

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Win64: Put a REX_W prefix on all TAILJMP* instructions MSDN's x64 software conventions page says that this is one of the fixed list of legal epilogues: https://msdn.microsoft.com/en-us/library/tawsa7cb.aspx Presumably this is how the unwinder distinguishes epilogue jumps from in-function control flow. Also normalize the way we place "## TAILCALL" comments on such jumps. llvm-svn: 227611
2015-01-31 05:03:31 +08:00
; RUN: llc -mtriple=x86_64-windows -show-mc-encoding < %s | FileCheck %s
; The Win64 ABI wants tail jmps to use a REX_W prefix so it can distinguish
; in-function jumps from function exiting jumps.
define void @tail_jmp_reg(i32, i32, void ()* %fptr) {
tail call void ()* %fptr()
ret void
}
; Check that we merge the REX prefixes into 0x49 instead of 0x48, 0x41.
; CHECK-LABEL: tail_jmp_reg:
; CHECK: rex64 jmpq *%r8
; CHECK: encoding: [0x49,0xff,0xe0]
declare void @tail_tgt()
define void @tail_jmp_imm() {
tail call void @tail_tgt()
ret void
}
; CHECK-LABEL: tail_jmp_imm:
; CHECK: rex64 jmp tail_tgt
@g_fptr = global void ()* @tail_tgt
define void @tail_jmp_mem() {
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%fptr = load void ()*, void ()** @g_fptr
Win64: Put a REX_W prefix on all TAILJMP* instructions MSDN's x64 software conventions page says that this is one of the fixed list of legal epilogues: https://msdn.microsoft.com/en-us/library/tawsa7cb.aspx Presumably this is how the unwinder distinguishes epilogue jumps from in-function control flow. Also normalize the way we place "## TAILCALL" comments on such jumps. llvm-svn: 227611
2015-01-31 05:03:31 +08:00
tail call void ()* %fptr()
ret void
}
; CHECK-LABEL: tail_jmp_mem:
; CHECK: rex64 jmpq *g_fptr(%rip)