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llvm-project/llvm/test/CodeGen/Thumb2/v8_IT_5.ll

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[ARMv8] Prevent generation of deprecated IT blocks on ARMv8 in Thumb mode. IT blocks can only be one instruction lonf, and can only contain a subset of the 16 instructions. Patch by Artyom Skrobov! llvm-svn: 190309
2013-09-09 22:21:49 +08:00
; RUN: llc < %s -mtriple=thumbv8 | FileCheck %s
Enable generating legacy IT block for AArch32 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. llvm-svn: 194592
2013-11-14 02:29:49 +08:00
; RUN: llc < %s -mtriple=thumbv7 -arm-restrict-it | FileCheck %s
[ARMv8] Prevent generation of deprecated IT blocks on ARMv8 in Thumb mode. IT blocks can only be one instruction lonf, and can only contain a subset of the 16 instructions. Patch by Artyom Skrobov! llvm-svn: 190309
2013-09-09 22:21:49 +08:00
; CHECK: it ne
; CHECK-NEXT: cmpne
; CHECK-NEXT: beq
; CHECK: cmp
; CHECK-NEXT: beq
; CHECK-NEXT: %if.else163
; CHECK-NEXT: mov.w
; CHECK-NEXT: b
; CHECK-NEXT: %if.else145
; CHECK-NEXT: mov.w
%struct.hc = type { i32, i32, i32, i32 }
define i32 @t(i32 %type) optsize {
entry:
br i1 undef, label %if.then, label %if.else
if.then:
unreachable
if.else:
br i1 undef, label %if.then15, label %if.else18
if.then15:
unreachable
if.else18:
switch i32 %type, label %if.else173 [
i32 3, label %if.then115
i32 1, label %if.then102
]
if.then102:
br i1 undef, label %cond.true10.i, label %t.exit
cond.true10.i:
br label %t.exit
t.exit:
unreachable
if.then115:
br i1 undef, label %if.else163, label %if.else145
if.else145:
%call150 = call fastcc %struct.hc* @foo(%struct.hc* undef, i32 34865152) optsize
br label %while.body172
if.else163:
%call168 = call fastcc %struct.hc* @foo(%struct.hc* undef, i32 34078720) optsize
br label %while.body172
while.body172:
br label %while.body172
if.else173:
ret i32 -1
}
declare hidden fastcc %struct.hc* @foo(%struct.hc* nocapture, i32) nounwind optsize