[AArch64] Add tests with sign cmps patterns that can be improved.

Some of the sign patterns can be optimized to or & asr, which requires
fewer instructions.

diff --git a/llvm/test/CodeGen/AArch64/cmp-select-sign.ll b/llvm/test/CodeGen/AArch64/cmp-select-sign.ll
new file mode 100644 (file)
index 0000000..55a1130
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/cmp-select-sign.ll
@@ -0,0 +1,297 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=arm64-apple-iphoneos -o - %s | FileCheck %s
+
+define i3 @sign_i3(i3 %a) {
+; CHECK-LABEL: sign_i3:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sbfx w8, w0, #0, #3
+; CHECK-NEXT:    cmp w8, #0 // =0
+; CHECK-NEXT:    mov w8, #1
+; CHECK-NEXT:    cneg w0, w8, lt
+; CHECK-NEXT:    ret
+  %c = icmp sgt i3 %a, -1
+  %res = select i1 %c, i3 1, i3 -1
+  ret i3 %res
+}
+
+define i4 @sign_i4(i4 %a) {
+; CHECK-LABEL: sign_i4:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sbfx w8, w0, #0, #4
+; CHECK-NEXT:    cmp w8, #0 // =0
+; CHECK-NEXT:    mov w8, #1
+; CHECK-NEXT:    cneg w0, w8, lt
+; CHECK-NEXT:    ret
+  %c = icmp sgt i4 %a, -1
+  %res = select i1 %c, i4 1, i4 -1
+  ret i4 %res
+}
+
+define i8 @sign_i8(i8 %a) {
+; CHECK-LABEL: sign_i8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sxtb w8, w0
+; CHECK-NEXT:    cmp w8, #0 // =0
+; CHECK-NEXT:    mov w8, #1
+; CHECK-NEXT:    cneg w0, w8, lt
+; CHECK-NEXT:    ret
+  %c = icmp sgt i8 %a, -1
+  %res = select i1 %c, i8 1, i8 -1
+  ret i8 %res
+}
+
+define i16 @sign_i16(i16 %a) {
+; CHECK-LABEL: sign_i16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sxth w8, w0
+; CHECK-NEXT:    cmp w8, #0 // =0
+; CHECK-NEXT:    mov w8, #1
+; CHECK-NEXT:    cneg w0, w8, lt
+; CHECK-NEXT:    ret
+  %c = icmp sgt i16 %a, -1
+  %res = select i1 %c, i16 1, i16 -1
+  ret i16 %res
+}
+
+define i32 @sign_i32(i32 %a) {
+; CHECK-LABEL: sign_i32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    cmp w0, #0 // =0
+; CHECK-NEXT:    mov w8, #1
+; CHECK-NEXT:    cneg w0, w8, lt
+; CHECK-NEXT:    ret
+  %c = icmp sgt i32 %a, -1
+  %res = select i1 %c, i32 1, i32 -1
+  ret i32 %res
+}
+
+define i64 @sign_i64(i64 %a) {
+; CHECK-LABEL: sign_i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    cmp x0, #0 // =0
+; CHECK-NEXT:    mov w8, #1
+; CHECK-NEXT:    cneg x0, x8, lt
+; CHECK-NEXT:    ret
+  %c = icmp sgt i64 %a, -1
+  %res = select i1 %c, i64 1, i64 -1
+  ret i64 %res
+}
+
+
+define i64 @not_sign_i64(i64 %a) {
+; CHECK-LABEL: not_sign_i64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    cmp x0, #0 // =0
+; CHECK-NEXT:    mov w8, #1
+; CHECK-NEXT:    cneg x0, x8, le
+; CHECK-NEXT:    ret
+  %c = icmp sgt i64 %a, 0
+  %res = select i1 %c, i64 1, i64 -1
+  ret i64 %res
+}
+
+define i64 @not_sign_i64_2(i64 %a) {
+; CHECK-LABEL: not_sign_i64_2:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    asr x0, x0, #63
+; CHECK-NEXT:    ret
+  %c = icmp sgt i64 %a, -1
+  %res = select i1 %c, i64 0, i64 -1
+  ret i64 %res
+}
+
+define i64 @not_sign_i64_3(i64 %a) {
+; CHECK-LABEL: not_sign_i64_3:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mvn x8, x0
+; CHECK-NEXT:    lsr x0, x8, #63
+; CHECK-NEXT:    ret
+  %c = icmp sgt i64 %a, -1
+  %res = select i1 %c, i64 1, i64 0
+  ret i64 %res
+}
+
+define i64 @not_sign_i64_4(i64 %a) {
+; CHECK-LABEL: not_sign_i64_4:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov x0, #-1
+; CHECK-NEXT:    ret
+  %c = icmp ugt i64 %a, -1
+  %res = select i1 %c, i64 1, i64 -1
+  ret i64 %res
+}
+
+define <7 x i8> @sign_7xi8(<7 x i8> %a) {
+; CHECK-LABEL: sign_7xi8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0xffffffffffffffff
+; CHECK-NEXT:    cmgt v0.8b, v0.8b, v1.8b
+; CHECK-NEXT:    movi v1.8b, #1
+; CHECK-NEXT:    and v1.8b, v0.8b, v1.8b
+; CHECK-NEXT:    orn v0.8b, v1.8b, v0.8b
+; CHECK-NEXT:    ret
+  %c = icmp sgt <7 x i8> %a, <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>
+  %res = select <7 x i1> %c, <7 x i8> <i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1>, <7 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>
+  ret <7 x i8> %res
+}
+
+define <8 x i8> @sign_8xi8(<8 x i8> %a) {
+; CHECK-LABEL: sign_8xi8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0xffffffffffffffff
+; CHECK-NEXT:    cmgt v0.8b, v0.8b, v1.8b
+; CHECK-NEXT:    movi v1.8b, #1
+; CHECK-NEXT:    and v1.8b, v0.8b, v1.8b
+; CHECK-NEXT:    orn v0.8b, v1.8b, v0.8b
+; CHECK-NEXT:    ret
+  %c = icmp sgt <8 x i8> %a, <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>
+  %res = select <8 x i1> %c, <8 x i8> <i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1>, <8 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>
+  ret <8 x i8> %res
+}
+
+define <16 x i8> @sign_16xi8(<16 x i8> %a) {
+; CHECK-LABEL: sign_16xi8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0xffffffffffffffff
+; CHECK-NEXT:    cmgt v0.16b, v0.16b, v1.16b
+; CHECK-NEXT:    movi v1.16b, #1
+; CHECK-NEXT:    and v1.16b, v0.16b, v1.16b
+; CHECK-NEXT:    orn v0.16b, v1.16b, v0.16b
+; CHECK-NEXT:    ret
+  %c = icmp sgt <16 x i8> %a, <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>
+  %res = select <16 x i1> %c, <16 x i8> <i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1>, <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>
+  ret <16 x i8> %res
+}
+
+define <3 x i32> @sign_3xi32(<3 x i32> %a) {
+; CHECK-LABEL: sign_3xi32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0xffffffffffffffff
+; CHECK-NEXT:    cmgt v0.4s, v0.4s, v1.4s
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    and v1.16b, v0.16b, v1.16b
+; CHECK-NEXT:    orn v0.16b, v1.16b, v0.16b
+; CHECK-NEXT:    ret
+  %c = icmp sgt <3 x i32> %a, <i32 -1, i32 -1, i32 -1>
+  %res = select <3 x i1> %c, <3 x i32> <i32 1, i32 1, i32 1>, <3 x i32> <i32 -1, i32 -1, i32 -1>
+  ret <3 x i32> %res
+}
+
+define <4 x i32> @sign_4xi32(<4 x i32> %a) {
+; CHECK-LABEL: sign_4xi32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    movi v1.2d, #0xffffffffffffffff
+; CHECK-NEXT:    cmgt v0.4s, v0.4s, v1.4s
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    and v1.16b, v0.16b, v1.16b
+; CHECK-NEXT:    orn v0.16b, v1.16b, v0.16b
+; CHECK-NEXT:    ret
+  %c = icmp sgt <4 x i32> %a, <i32 -1, i32 -1, i32 -1, i32 -1>
+  %res = select <4 x i1> %c, <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
+  ret <4 x i32> %res
+}
+
+define <4 x i32> @sign_4xi32_multi_use(<4 x i32> %a) {
+; CHECK-LABEL: sign_4xi32_multi_use:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sub sp, sp, #32 // =32
+; CHECK-NEXT:    str x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    .cfi_def_cfa_offset 32
+; CHECK-NEXT:    .cfi_offset w30, -16
+; CHECK-NEXT:    movi v1.2d, #0xffffffffffffffff
+; CHECK-NEXT:    movi v2.4s, #1
+; CHECK-NEXT:    cmgt v0.4s, v0.4s, v1.4s
+; CHECK-NEXT:    and v1.16b, v0.16b, v2.16b
+; CHECK-NEXT:    orn v1.16b, v1.16b, v0.16b
+; CHECK-NEXT:    xtn v0.4h, v0.4s
+; CHECK-NEXT:    str q1, [sp] // 16-byte Folded Spill
+; CHECK-NEXT:    bl use_4xi1
+; CHECK-NEXT:    ldr q0, [sp] // 16-byte Folded Reload
+; CHECK-NEXT:    ldr x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    add sp, sp, #32 // =32
+; CHECK-NEXT:    ret
+  %c = icmp sgt <4 x i32> %a, <i32 -1, i32 -1, i32 -1, i32 -1>
+  %res = select <4 x i1> %c, <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
+  call void @use_4xi1(<4 x i1> %c)
+  ret <4 x i32> %res
+}
+
+; Second icmp operand breaks sign pattern.
+define <4 x i32> @not_sign_4xi32(<4 x i32> %a) {
+; CHECK-LABEL: not_sign_4xi32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    adrp x8, .LCPI16_0
+; CHECK-NEXT:    ldr q1, [x8, :lo12:.LCPI16_0]
+; CHECK-NEXT:    cmgt v0.4s, v0.4s, v1.4s
+; CHECK-NEXT:    movi v1.4s, #1
+; CHECK-NEXT:    and v1.16b, v0.16b, v1.16b
+; CHECK-NEXT:    orn v0.16b, v1.16b, v0.16b
+; CHECK-NEXT:    ret
+  %c = icmp sgt <4 x i32> %a, <i32 1, i32 -1, i32 -1, i32 -1>
+  %res = select <4 x i1> %c, <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
+  ret <4 x i32> %res
+}
+
+; First select operand breaks sign pattern.
+define <4 x i32> @not_sign_4xi32_2(<4 x i32> %a) {
+; CHECK-LABEL: not_sign_4xi32_2:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    adrp x8, .LCPI17_0
+; CHECK-NEXT:    ldr q1, [x8, :lo12:.LCPI17_0]
+; CHECK-NEXT:    movi v2.2d, #0xffffffffffffffff
+; CHECK-NEXT:    cmgt v0.4s, v0.4s, v2.4s
+; CHECK-NEXT:    and v1.16b, v0.16b, v1.16b
+; CHECK-NEXT:    orn v0.16b, v1.16b, v0.16b
+; CHECK-NEXT:    ret
+  %c = icmp sgt <4 x i32> %a, <i32 -1, i32 -1, i32 -1, i32 -1>
+  %res = select <4 x i1> %c, <4 x i32> <i32 1, i32 1, i32 -1, i32 1>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
+  ret <4 x i32> %res
+}
+
+; Second select operand breaks sign pattern.
+define <4 x i32> @not_sign_4xi32_3(<4 x i32> %a) {
+; CHECK-LABEL: not_sign_4xi32_3:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    adrp x8, .LCPI18_0
+; CHECK-NEXT:    ldr q1, [x8, :lo12:.LCPI18_0]
+; CHECK-NEXT:    movi v2.2d, #0xffffffffffffffff
+; CHECK-NEXT:    cmgt v0.4s, v0.4s, v2.4s
+; CHECK-NEXT:    movi v2.4s, #1
+; CHECK-NEXT:    bsl v0.16b, v2.16b, v1.16b
+; CHECK-NEXT:    ret
+  %c = icmp sgt <4 x i32> %a, <i32 -1, i32 -1, i32 -1, i32 -1>
+  %res = select <4 x i1> %c, <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 1>
+  ret <4 x i32> %res
+}
+
+; i65 is not legal.
+define <4 x i65> @sign_4xi65(<4 x i65> %a) {
+; CHECK-LABEL: sign_4xi65:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    sbfx x11, x3, #0, #1
+; CHECK-NEXT:    sbfx x10, x5, #0, #1
+; CHECK-NEXT:    mov w12, #1
+; CHECK-NEXT:    cmp x11, #0 // =0
+; CHECK-NEXT:    sbfx x9, x7, #0, #1
+; CHECK-NEXT:    cneg x2, x12, lt
+; CHECK-NEXT:    cmp x10, #0 // =0
+; CHECK-NEXT:    sbfx x8, x1, #0, #1
+; CHECK-NEXT:    cneg x4, x12, lt
+; CHECK-NEXT:    cmp x9, #0 // =0
+; CHECK-NEXT:    cneg x6, x12, lt
+; CHECK-NEXT:    cmp x8, #0 // =0
+; CHECK-NEXT:    lsr x5, x10, #63
+; CHECK-NEXT:    cneg x10, x12, lt
+; CHECK-NEXT:    lsr x1, x8, #63
+; CHECK-NEXT:    fmov d0, x10
+; CHECK-NEXT:    mov v0.d[1], x1
+; CHECK-NEXT:    lsr x3, x11, #63
+; CHECK-NEXT:    lsr x7, x9, #63
+; CHECK-NEXT:    fmov x0, d0
+; CHECK-NEXT:    ret
+  %c = icmp sgt <4 x i65> %a, <i65 -1, i65 -1, i65 -1, i65 -1>
+  %res = select <4 x i1> %c, <4 x i65> <i65 1, i65 1, i65 1, i65 1>, <4 x i65 > <i65 -1, i65 -1, i65 -1, i65 -1>
+  ret <4 x i65> %res
+}
+
+declare void @use_4xi1(<4 x i1>)