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Enable generating legacy IT block for AArch32

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By default, the behavior of IT block generation will be determinated
dynamically base on the arch (armv8 vs armv7). This patch adds backend
options: -arm-restrict-it and -arm-no-restrict-it.  The former one
restricts the generation of IT blocks (the same behavior as thumbv8) for
both arches. The later one allows the generation of legacy IT block (the
same behavior as ARMv7 Thumb2) for both arches.

Clang will support -mrestrict-it and -mno-restrict-it, which is
compatible with GCC.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194592 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Weiming Zhao
2013-11-13 18:29:49 +00:00
parent e258845a63
commit 929bdb2379
14 changed files with 57 additions and 8 deletions
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1
test/CodeGen/Thumb2/v8_IT_2.ll
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@@ -1,4 +1,5 @@
; RUN: llc < %s -mtriple=thumbv8 | FileCheck %s
; RUN: llc < %s -mtriple=thumbv7 -arm-restrict-it | FileCheck %s
%struct.quad_struct = type { i32, i32, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct* }