[PATCH] D40959: [mips] Provide additional DSP bitconvert patterns

[Stefan Maksimovic via Phabricator via llvm-commits]

smaksimovic created this revision.
Herald added subscribers: arichardson, srhines.

Previously, v2i16 -> f32 bitcast could not be matched.
Add patterns to support matching this and similar types of bitcasts.


https://reviews.llvm.org/D40959

Files:
  lib/Target/Mips/MipsDSPInstrInfo.td
  test/CodeGen/Mips/v2i16tof32.ll


Index: test/CodeGen/Mips/v2i16tof32.ll
===================================================================
--- test/CodeGen/Mips/v2i16tof32.ll
+++ test/CodeGen/Mips/v2i16tof32.ll
@@ -0,0 +1,19 @@
+; RUN: llc < %s -O2 -mtriple mipsel--linux-android -mattr=+dsp -verify-machineinstrs 
+
+; Function below generates a v2i16 to f32 bitcast.
+; Test that we are able to match it.
+
+define float @f(<8 x i16>* %a) {
+entry:
+  %m = alloca <8 x i16>
+  %0 = load <8 x i16>, <8 x i16>* %a
+  store <8 x i16> %0, <8 x i16>* %m 
+  %1 = bitcast <8 x i16> %0 to <4 x float>
+  %2 = shufflevector <4 x float> %1, <4 x float> undef, <8 x i32> <i32 0, i32 3, i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef>
+  %3 = shufflevector <8 x float> zeroinitializer, <8 x float> %2, <8 x i32> <i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7>
+  %4 = bitcast <8 x float> %3 to <8 x i32>
+  %5 = extractelement <8 x i32> %4, i32 0
+  %6 = bitcast i32 %5 to float
+  ret float %6
+}
+
Index: lib/Target/Mips/MipsDSPInstrInfo.td
===================================================================
--- lib/Target/Mips/MipsDSPInstrInfo.td
+++ lib/Target/Mips/MipsDSPInstrInfo.td
@@ -1325,6 +1325,10 @@
 def : BitconvertPat<i32, v4i8, GPR32, DSPR>;
 def : BitconvertPat<v2i16, i32, DSPR, GPR32>;
 def : BitconvertPat<v4i8, i32, DSPR, GPR32>;
+def : BitconvertPat<f32, v2i16, FGR32, DSPR>;
+def : BitconvertPat<f32, v4i8, FGR32, DSPR>;
+def : BitconvertPat<v2i16, f32, DSPR, FGR32>;
+def : BitconvertPat<v4i8, f32, DSPR, FGR32>;
 
 def : DSPPat<(v2i16 (load addr:$a)),
              (v2i16 (COPY_TO_REGCLASS (LW addr:$a), DSPR))>;


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