Fix early-clobber handling in shrinkToUses.

I broke this in r144515, it affected most ARM testers.

<rdar://problem/10441389>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144547 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 62 insertions, 0 deletions

diff --git a/test/CodeGen/ARM/2011-11-14-EarlyClobber.ll b/test/CodeGen/ARM/2011-11-14-EarlyClobber.ll
new file mode 100644
index 0000000000..52aa0bfaa5
--- /dev/null
+++ b/test/CodeGen/ARM/2011-11-14-EarlyClobber.ll
@@ -0,0 +1,62 @@
+; RUN: llc < %s -mcpu=cortex-a8 -verify-regalloc
+target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"
+target triple = "thumbv7-apple-ios"
+
+; This test calls shrinkToUses with an early-clobber redefined live range during
+; spilling.
+;
+;   Shrink: %vreg47,1.158257e-02 = [384r,400e:0)[400e,420r:1)  0@384r 1@400e
+;
+; The early-clobber instruction is an str:
+;
+;   %vreg12<earlyclobber,def> = t2STR_PRE %vreg6, %vreg12, 32, pred:14, pred:%noreg
+;
+; This tests that shrinkToUses handles the EC redef correctly.
+
+%struct.Transform_Struct.0.11.12.17.43.46.56.58.60 = type { [4 x [4 x double]] }
+
+define void @Compute_Axis_Rotation_Transform(%struct.Transform_Struct.0.11.12.17.43.46.56.58.60* nocapture %transform, double* nocapture %V1, double %angle) nounwind {
+entry:
+  store double 1.000000e+00, double* null, align 4
+  %arrayidx5.1.i = getelementptr inbounds %struct.Transform_Struct.0.11.12.17.43.46.56.58.60* %transform, i32 0, i32 0, i32 0, i32 1
+  store double 0.000000e+00, double* %arrayidx5.1.i, align 4
+  %arrayidx5.2.i = getelementptr inbounds %struct.Transform_Struct.0.11.12.17.43.46.56.58.60* %transform, i32 0, i32 0, i32 0, i32 2
+  store double 0.000000e+00, double* %arrayidx5.2.i, align 4
+  %arrayidx5.114.i = getelementptr inbounds %struct.Transform_Struct.0.11.12.17.43.46.56.58.60* %transform, i32 0, i32 0, i32 1, i32 0
+  store double 0.000000e+00, double* %arrayidx5.114.i, align 4
+  %arrayidx5.1.1.i = getelementptr inbounds %struct.Transform_Struct.0.11.12.17.43.46.56.58.60* %transform, i32 0, i32 0, i32 1, i32 1
+  store double 1.000000e+00, double* %arrayidx5.1.1.i, align 4
+  store double 0.000000e+00, double* null, align 4
+  store double 1.000000e+00, double* null, align 4
+  store double 0.000000e+00, double* null, align 4
+  %call = tail call double @cos(double %angle) nounwind readnone
+  %call1 = tail call double @sin(double %angle) nounwind readnone
+  %0 = load double* %V1, align 4
+  %arrayidx2 = getelementptr inbounds double* %V1, i32 1
+  %1 = load double* %arrayidx2, align 4
+  %mul = fmul double %0, %1
+  %sub = fsub double 1.000000e+00, %call
+  %mul3 = fmul double %mul, %sub
+  %2 = load double* undef, align 4
+  %mul5 = fmul double %2, %call1
+  %add = fadd double %mul3, %mul5
+  store double %add, double* %arrayidx5.1.i, align 4
+  %3 = load double* %V1, align 4
+  %mul11 = fmul double %3, undef
+  %mul13 = fmul double %mul11, %sub
+  %4 = load double* %arrayidx2, align 4
+  %mul15 = fmul double %4, %call1
+  %sub16 = fsub double %mul13, %mul15
+  store double %sub16, double* %arrayidx5.2.i, align 4
+  %5 = load double* %V1, align 4
+  %6 = load double* %arrayidx2, align 4
+  %mul22 = fmul double %5, %6
+  %mul24 = fmul double %mul22, %sub
+  %sub27 = fsub double %mul24, undef
+  store double %sub27, double* %arrayidx5.114.i, align 4
+  ret void
+}
+
+declare double @cos(double) nounwind readnone
+
+declare double @sin(double) nounwind readnone