llvm/test/CodeGen/ARM/widen-vmovs.ll
Jakob Stoklund Olesen 1c062c24ab Fix -widen-vmovs liveness issues.
When widening a copy, we are reading a larger register that may not be
live.  Use an <undef> flag to tell the register scavenger and machine
code verifier that we know the value isn't defined.

We now widen:

  %S6<def> = COPY %S4<kill>, %D3<imp-def>

into:

  %D3<def> = VMOVD %D2<undef>, pred:14, pred:%noreg, %S4<imp-use,kill>

This also keeps the <kill> flag on %S4 so we don't inadvertently kill a
live value in %S5.

Finally, ensure that ARMBaseInstrInfo::setExecutionDomain() preserves
the <undef> flag when converting VMOVD to VORR.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141746 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-12 00:06:23 +00:00

36 lines
1.1 KiB
LLVM

; RUN: llc < %s -widen-vmovs -mcpu=cortex-a8 -verify-machineinstrs | FileCheck %s
target triple = "thumbv7-apple-ios"
; The 0.0 constant is loaded from the constant pool and kept in a register.
; CHECK: %entry
; CHECK: vldr.32 s
; The float loop variable is initialized with a vmovs from the constant register.
; The vmovs is first widened to a vmovd, and then converted to a vorr because of the v2f32 vadd.f32.
; CHECK: vorr [[DL:d[0-9]+]], [[DN:d[0-9]+]]
; CHECK: , [[DN]]
; CHECK: %for.body.i
; CHECK: vadd.f32 [[DL]], [[DL]], [[DN]]
;
; This test is verifying:
; - The VMOVS widening is happening.
; - Register liveness is verified.
; - The execution domain switch to vorr works across basic blocks.
define void @Mm() nounwind {
entry:
br label %for.body4
for.body4:
br label %for.body.i
for.body.i:
%tmp3.i = phi float [ 0.000000e+00, %for.body4 ], [ %add.i, %for.body.i ]
%add.i = fadd float %tmp3.i, 0.000000e+00
%exitcond.i = icmp eq i32 undef, 41
br i1 %exitcond.i, label %rInnerproduct.exit, label %for.body.i
rInnerproduct.exit:
store float %add.i, float* undef, align 4
br label %for.body4
}