vendor/llvm/llvm-trunk-r178860

1 files changed, 218 insertions, 0 deletions

diff --git a/test/CodeGen/AArch64/bitfield.ll b/test/CodeGen/AArch64/bitfield.ll
new file mode 100644
index 0000000000000..36d337ef05ef5
--- /dev/null
+++ b/test/CodeGen/AArch64/bitfield.ll
@@ -0,0 +1,218 @@
+
+; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu | FileCheck %s
+
+@var32 = global i32 0
+@var64 = global i64 0
+
+define void @test_extendb(i8 %var) {
+; CHECK: test_extendb:
+
+  %sxt32 = sext i8 %var to i32
+  store volatile i32 %sxt32, i32* @var32
+; CHECK: sxtb {{w[0-9]+}}, {{w[0-9]+}}
+
+  %sxt64 = sext i8 %var to i64
+  store volatile i64 %sxt64, i64* @var64
+; CHECK: sxtb {{x[0-9]+}}, {{w[0-9]+}}
+
+; N.b. this doesn't actually produce a bitfield instruction at the
+; moment, but it's still a good test to have and the semantics are
+; correct.
+  %uxt32 = zext i8 %var to i32
+  store volatile i32 %uxt32, i32* @var32
+; CHECK: and {{w[0-9]+}}, {{w[0-9]+}}, #0xff
+
+  %uxt64 = zext i8 %var to i64
+  store volatile i64 %uxt64, i64* @var64
+; CHECK: uxtb {{x[0-9]+}}, {{w[0-9]+}}
+  ret void
+}
+
+define void @test_extendh(i16 %var) {
+; CHECK: test_extendh:
+
+  %sxt32 = sext i16 %var to i32
+  store volatile i32 %sxt32, i32* @var32
+; CHECK: sxth {{w[0-9]+}}, {{w[0-9]+}}
+
+  %sxt64 = sext i16 %var to i64
+  store volatile i64 %sxt64, i64* @var64
+; CHECK: sxth {{x[0-9]+}}, {{w[0-9]+}}
+
+; N.b. this doesn't actually produce a bitfield instruction at the
+; moment, but it's still a good test to have and the semantics are
+; correct.
+  %uxt32 = zext i16 %var to i32
+  store volatile i32 %uxt32, i32* @var32
+; CHECK: and {{w[0-9]+}}, {{w[0-9]+}}, #0xffff
+
+  %uxt64 = zext i16 %var to i64
+  store volatile i64 %uxt64, i64* @var64
+; CHECK: uxth {{x[0-9]+}}, {{w[0-9]+}}
+  ret void
+}
+
+define void @test_extendw(i32 %var) {
+; CHECK: test_extendw:
+
+  %sxt64 = sext i32 %var to i64
+  store volatile i64 %sxt64, i64* @var64
+; CHECK: sxtw {{x[0-9]+}}, {{w[0-9]+}}
+
+  %uxt64 = zext i32 %var to i64
+  store volatile i64 %uxt64, i64* @var64
+; CHECK: ubfx {{w[0-9]+}}, {{w[0-9]+}}, #0, #32
+  ret void
+}
+
+define void @test_shifts(i32 %val32, i64 %val64) {
+; CHECK: test_shifts:
+
+  %shift1 = ashr i32 %val32, 31
+  store volatile i32 %shift1, i32* @var32
+; CHECK: asr {{w[0-9]+}}, {{w[0-9]+}}, #31
+
+  %shift2 = lshr i32 %val32, 8
+  store volatile i32 %shift2, i32* @var32
+; CHECK: lsr {{w[0-9]+}}, {{w[0-9]+}}, #8
+
+  %shift3 = shl i32 %val32, 1
+  store volatile i32 %shift3, i32* @var32
+; CHECK: lsl {{w[0-9]+}}, {{w[0-9]+}}, #1
+
+  %shift4 = ashr i64 %val64, 31
+  store volatile i64 %shift4, i64* @var64
+; CHECK: asr {{x[0-9]+}}, {{x[0-9]+}}, #31
+
+  %shift5 = lshr i64 %val64, 8
+  store volatile i64 %shift5, i64* @var64
+; CHECK: lsr {{x[0-9]+}}, {{x[0-9]+}}, #8
+
+  %shift6 = shl i64 %val64, 63
+  store volatile i64 %shift6, i64* @var64
+; CHECK: lsl {{x[0-9]+}}, {{x[0-9]+}}, #63
+
+  %shift7 = ashr i64 %val64, 63
+  store volatile i64 %shift7, i64* @var64
+; CHECK: asr {{x[0-9]+}}, {{x[0-9]+}}, #63
+
+  %shift8 = lshr i64 %val64, 63
+  store volatile i64 %shift8, i64* @var64
+; CHECK: lsr {{x[0-9]+}}, {{x[0-9]+}}, #63
+
+  %shift9 = lshr i32 %val32, 31
+  store volatile i32 %shift9, i32* @var32
+; CHECK: lsr {{w[0-9]+}}, {{w[0-9]+}}, #31
+
+  %shift10 = shl i32 %val32, 31
+  store volatile i32 %shift10, i32* @var32
+; CHECK: lsl {{w[0-9]+}}, {{w[0-9]+}}, #31
+
+  ret void
+}
+
+; LLVM can produce in-register extensions taking place entirely with
+; 64-bit registers too.
+define void @test_sext_inreg_64(i64 %in) {
+; CHECK: test_sext_inreg_64:
+
+; i1 doesn't have an official alias, but crops up and is handled by
+; the bitfield ops.
+  %trunc_i1 = trunc i64 %in to i1
+  %sext_i1 = sext i1 %trunc_i1 to i64
+  store volatile i64 %sext_i1, i64* @var64
+; CHECK: sbfx {{x[0-9]+}}, {{x[0-9]+}}, #0, #1
+
+  %trunc_i8 = trunc i64 %in to i8
+  %sext_i8 = sext i8 %trunc_i8 to i64
+  store volatile i64 %sext_i8, i64* @var64
+; CHECK: sxtb {{x[0-9]+}}, {{w[0-9]+}}
+
+  %trunc_i16 = trunc i64 %in to i16
+  %sext_i16 = sext i16 %trunc_i16 to i64
+  store volatile i64 %sext_i16, i64* @var64
+; CHECK: sxth {{x[0-9]+}}, {{w[0-9]+}}
+
+  %trunc_i32 = trunc i64 %in to i32
+  %sext_i32 = sext i32 %trunc_i32 to i64
+  store volatile i64 %sext_i32, i64* @var64
+; CHECK: sxtw {{x[0-9]+}}, {{w[0-9]+}}
+  ret void
+}
+
+; These instructions don't actually select to official bitfield
+; operations, but it's important that we select them somehow:
+define void @test_zext_inreg_64(i64 %in) {
+; CHECK: test_zext_inreg_64:
+
+  %trunc_i8 = trunc i64 %in to i8
+  %zext_i8 = zext i8 %trunc_i8 to i64
+  store volatile i64 %zext_i8, i64* @var64
+; CHECK: and {{x[0-9]+}}, {{x[0-9]+}}, #0xff
+
+  %trunc_i16 = trunc i64 %in to i16
+  %zext_i16 = zext i16 %trunc_i16 to i64
+  store volatile i64 %zext_i16, i64* @var64
+; CHECK: and {{x[0-9]+}}, {{x[0-9]+}}, #0xffff
+
+  %trunc_i32 = trunc i64 %in to i32
+  %zext_i32 = zext i32 %trunc_i32 to i64
+  store volatile i64 %zext_i32, i64* @var64
+; CHECK: and {{x[0-9]+}}, {{x[0-9]+}}, #0xffffffff
+
+  ret void
+}
+
+define i64 @test_sext_inreg_from_32(i32 %in) {
+; CHECK: test_sext_inreg_from_32:
+
+  %small = trunc i32 %in to i1
+  %ext = sext i1 %small to i64
+
+  ; Different registers are of course, possible, though suboptimal. This is
+  ; making sure that a 64-bit "(sext_inreg (anyext GPR32), i1)" uses the 64-bit
+  ; sbfx rather than just 32-bits.
+; CHECK: sbfx x0, x0, #0, #1
+  ret i64 %ext
+}
+
+
+define i32 @test_ubfx32(i32* %addr) {
+; CHECK: test_ubfx32:
+; CHECK: ubfx {{w[0-9]+}}, {{w[0-9]+}}, #23, #3
+
+   %fields = load i32* %addr
+   %shifted = lshr i32 %fields, 23
+   %masked = and i32 %shifted, 7
+   ret i32 %masked
+}
+
+define i64 @test_ubfx64(i64* %addr) {
+; CHECK: test_ubfx64:
+; CHECK: ubfx {{x[0-9]+}}, {{x[0-9]+}}, #25, #10
+
+   %fields = load i64* %addr
+   %shifted = lshr i64 %fields, 25
+   %masked = and i64 %shifted, 1023
+   ret i64 %masked
+}
+
+define i32 @test_sbfx32(i32* %addr) {
+; CHECK: test_sbfx32:
+; CHECK: sbfx {{w[0-9]+}}, {{w[0-9]+}}, #6, #3
+
+   %fields = load i32* %addr
+   %shifted = shl i32 %fields, 23
+   %extended = ashr i32 %shifted, 29
+   ret i32 %extended
+}
+
+define i64 @test_sbfx64(i64* %addr) {
+; CHECK: test_sbfx64:
+; CHECK: sbfx {{x[0-9]+}}, {{x[0-9]+}}, #0, #63
+
+   %fields = load i64* %addr
+   %shifted = shl i64 %fields, 1
+   %extended = ashr i64 %shifted, 1
+   ret i64 %extended
+}