Hexagon: Add patterns to generate 'combine' instructions.

llvm-svn: 181805

1 files changed, 80 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/Hexagon/extload-combine.ll b/llvm/test/CodeGen/Hexagon/extload-combine.ll
new file mode 100644
index 00000000000..b3b8bf07032
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/extload-combine.ll
@@ -0,0 +1,80 @@
+; RUN: llc -march=hexagon -mcpu=hexagonv4 -O3 < %s | FileCheck %s
+; Check that the combine/stxw instructions are being generated.
+; In case of combine one of the operand should be 0 and another should be
+; the output of absolute addressing load instruction.
+
+@a = external global i16
+@b = external global i16
+@c = external global i16
+@char_a = external global i8
+@char_b = external global i8
+@char_c = external global i8
+@int_a = external global i32
+@int_b = external global i32
+@int_c = external global i32
+
+; Function Attrs: nounwind
+define i64 @short_test1() #0 {
+; CHECK: [[VAR:r[0-9]+]]{{ *}}={{ *}}memuh(##
+; CHECK: combine(#0, [[VAR]])
+entry:
+  store i16 0, i16* @a, align 2
+  %0 = load i16* @b, align 2
+  %conv2 = zext i16 %0 to i64
+  ret i64 %conv2
+}
+
+; Function Attrs: nounwind
+define i64 @short_test2() #0 {
+; CHECK: [[VAR1:r[0-9]+]]{{ *}}={{ *}}memh(##
+; CHECK: sxtw([[VAR1]])
+entry:
+  store i16 0, i16* @a, align 2
+  %0 = load i16* @c, align 2
+  %conv2 = sext i16 %0 to i64
+  ret i64 %conv2
+}
+
+; Function Attrs: nounwind
+define i64 @char_test1() #0 {
+; CHECK: [[VAR2:r[0-9]+]]{{ *}}={{ *}}memub(##
+; CHECK: combine(#0, [[VAR2]])
+entry:
+  store i8 0, i8* @char_a, align 1
+  %0 = load i8* @char_b, align 1
+  %conv2 = zext i8 %0 to i64
+  ret i64 %conv2
+}
+
+; Function Attrs: nounwind
+define i64 @char_test2() #0 {
+; CHECK: [[VAR3:r[0-9]+]]{{ *}}={{ *}}memb(##
+; CHECK: sxtw([[VAR3]])
+entry:
+  store i8 0, i8* @char_a, align 1
+  %0 = load i8* @char_c, align 1
+  %conv2 = sext i8 %0 to i64
+  ret i64 %conv2
+}
+
+; Function Attrs: nounwind
+define i64 @int_test1() #0 {
+; CHECK: [[VAR4:r[0-9]+]]{{ *}}={{ *}}memw(##
+; CHECK: combine(#0, [[VAR4]])
+entry:
+  store i32 0, i32* @int_a, align 4
+  %0 = load i32* @int_b, align 4
+  %conv = zext i32 %0 to i64
+  ret i64 %conv
+}
+
+; Function Attrs: nounwind
+define i64 @int_test2() #0 {
+; CHECK: [[VAR5:r[0-9]+]]{{ *}}={{ *}}memw(##
+; CHECK: sxtw([[VAR5]])
+entry:
+  store i32 0, i32* @int_a, align 4
+  %0 = load i32* @int_c, align 4
+  %conv = sext i32 %0 to i64
+  ret i64 %conv
+}