1 files changed, 65 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/Hexagon/swp-epilog-reuse.ll b/llvm/test/CodeGen/Hexagon/swp-epilog-reuse.ll
new file mode 100644
index 00000000000..6a2ad73f209
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/swp-epilog-reuse.ll
@@ -0,0 +1,65 @@
+; RUN: llc -fp-contract=fast -O3 -march=hexagon -mcpu=hexagonv5 < %s
+; REQUIRES: asserts
+
+; Test that the pipeliner doesn't ICE due because the PHI generation
+; code in the epilog does not attempt to reuse an existing PHI.
+
+define void @test(float* noalias %srcImg, i32 %width, float* noalias %dstImg) {
+entry.split:
+  %shr = lshr i32 %width, 1
+  %incdec.ptr253 = getelementptr inbounds float, float* %dstImg, i32 2
+  br i1 undef, label %for.body, label %for.end
+
+for.body:
+  %dst.21518.reg2mem.0 = phi float* [ null, %while.end712 ], [ %incdec.ptr253, %entry.split ]
+  %dstEnd.01519 = phi float* [ %add.ptr725, %while.end712 ], [ undef, %entry.split ]
+  %add.ptr367 = getelementptr inbounds float, float* %srcImg, i32 undef
+  %dst.31487 = getelementptr inbounds float, float* %dst.21518.reg2mem.0, i32 1
+  br i1 undef, label %while.body661.preheader, label %while.end712
+
+while.body661.preheader:
+  %scevgep1941 = getelementptr float, float* %add.ptr367, i32 1
+  br label %while.body661.ur
+
+while.body661.ur:
+  %lsr.iv1942 = phi float* [ %scevgep1941, %while.body661.preheader ], [ undef, %while.body661.ur ]
+  %col1.31508.reg2mem.0.ur = phi float [ %col3.31506.reg2mem.0.ur, %while.body661.ur ], [ undef, %while.body661.preheader ]
+  %col4.31507.reg2mem.0.ur = phi float [ %add710.ur, %while.body661.ur ], [ 0.000000e+00, %while.body661.preheader ]
+  %col3.31506.reg2mem.0.ur = phi float [ %add689.ur, %while.body661.ur ], [ undef, %while.body661.preheader ]
+  %dst.41511.ur = phi float* [ %incdec.ptr674.ur, %while.body661.ur ], [ %dst.31487, %while.body661.preheader ]
+  %mul662.ur = fmul float %col1.31508.reg2mem.0.ur, 4.000000e+00
+  %add663.ur = fadd float undef, %mul662.ur
+  %add665.ur = fadd float %add663.ur, undef
+  %add667.ur = fadd float undef, %add665.ur
+  %add669.ur = fadd float undef, %add667.ur
+  %add670.ur = fadd float %col4.31507.reg2mem.0.ur, %add669.ur
+  %conv673.ur = fmul float %add670.ur, 3.906250e-03
+  %incdec.ptr674.ur = getelementptr inbounds float, float* %dst.41511.ur, i32 1
+  store float %conv673.ur, float* %dst.41511.ur, align 4
+  %scevgep1959 = getelementptr float, float* %lsr.iv1942, i32 -1
+  %0 = load float, float* %scevgep1959, align 4
+  %mul680.ur = fmul float %0, 4.000000e+00
+  %add681.ur = fadd float undef, %mul680.ur
+  %add684.ur = fadd float undef, %add681.ur
+  %add687.ur = fadd float undef, %add684.ur
+  %add689.ur = fadd float undef, %add687.ur
+  %add699.ur = fadd float undef, undef
+  %add703.ur = fadd float undef, %add699.ur
+  %add707.ur = fadd float undef, %add703.ur
+  %add710.ur = fadd float undef, %add707.ur
+  %cmp660.ur = icmp ult float* %incdec.ptr674.ur, %dstEnd.01519
+  br i1 %cmp660.ur, label %while.body661.ur, label %while.end712
+
+while.end712:
+  %dst.4.lcssa.reg2mem.0 = phi float* [ %dst.31487, %for.body ], [ undef, %while.body661.ur ]
+  %conv721 = fpext float undef to double
+  %mul722 = fmul double %conv721, 0x3F7111112119E8FB
+  %conv723 = fptrunc double %mul722 to float
+  store float %conv723, float* %dst.4.lcssa.reg2mem.0, align 4
+  %add.ptr725 = getelementptr inbounds float, float* %dstEnd.01519, i32 %shr
+  %cmp259 = icmp ult i32 undef, undef
+  br i1 %cmp259, label %for.body, label %for.end
+
+for.end:
+  ret void
+}