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llvm-project/llvm/test/CodeGen/Thumb2/ifcvt-compare.ll

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Thumb2: When optimizing for size, do not if-convert branches involving comparisons with zero. This allows the constant island pass to lower these branches to cbn?z instructions, resulting in a shorter instruction sequence. Differential Revision: http://reviews.llvm.org/D9183 llvm-svn: 235638
2015-04-24 04:31:30 +08:00
; RUN: llc -mtriple=thumbv7-unknown-linux %s -o - | FileCheck %s
declare void @x()
define void @f0(i32 %x) optsize {
; CHECK-LABEL: f0:
; CHECK: cbnz
%p = icmp eq i32 %x, 0
br i1 %p, label %t, label %f
t:
call void @x()
br label %f
f:
ret void
}
define void @f1(i32 %x) optsize {
; CHECK-LABEL: f1:
; CHECK: cmp r0, #1
[ARM] Enable shrink-wrapping by default. Differential Revision: http://reviews.llvm.org/D14357 rdar://problem/21942589 llvm-svn: 253411
2015-11-18 08:40:54 +08:00
; CHECK: it ne
; CHECK-NEXT: bxne lr
Thumb2: When optimizing for size, do not if-convert branches involving comparisons with zero. This allows the constant island pass to lower these branches to cbn?z instructions, resulting in a shorter instruction sequence. Differential Revision: http://reviews.llvm.org/D9183 llvm-svn: 235638
2015-04-24 04:31:30 +08:00
%p = icmp eq i32 %x, 1
br i1 %p, label %t, label %f
t:
call void @x()
br label %f
f:
ret void
}
define void @f2(i32 %x) {
; CHECK-LABEL: f2:
; CHECK: cmp r0, #0
[ARM] Enable shrink-wrapping by default. Differential Revision: http://reviews.llvm.org/D14357 rdar://problem/21942589 llvm-svn: 253411
2015-11-18 08:40:54 +08:00
; CHECK: it ne
; CHECK-NEXT: bxne lr
Thumb2: When optimizing for size, do not if-convert branches involving comparisons with zero. This allows the constant island pass to lower these branches to cbn?z instructions, resulting in a shorter instruction sequence. Differential Revision: http://reviews.llvm.org/D9183 llvm-svn: 235638
2015-04-24 04:31:30 +08:00
%p = icmp eq i32 %x, 0
br i1 %p, label %t, label %f
t:
call void @x()
br label %f
f:
ret void
}