[GlobalIsel][X86] support G_CONSTANT selection.

Summary: [GlobalISel][X86] support G_CONSTANT selection. Add regbank select tests.

Reviewers: zvi, guyblank

Reviewed By: guyblank

Subscribers: llvm-commits, dberris, rovka, kristof.beyls

Differential Revision: https://reviews.llvm.org/D31974

llvm-svn: 300057

3 files changed, 224 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/GlobalISel/X86-regbankselect.mir b/llvm/test/CodeGen/X86/GlobalISel/X86-regbankselect.mir
index e9a0957845a..c4e5fb2d05f 100644
--- a/llvm/test/CodeGen/X86/GlobalISel/X86-regbankselect.mir
+++ b/llvm/test/CodeGen/X86/GlobalISel/X86-regbankselect.mir
@@ -102,6 +102,10 @@
     ret double* %p1
   }
 
+  define void @constInt_check() {
+    ret void
+  }
+
 ...
 ---
 name:            test_add_i8
@@ -604,4 +608,27 @@ body:             |
     RET 0, implicit %rax
 
 ...
+---
+name:            constInt_check
+alignment:       4
+legalized:       true
+# CHECK-LABEL: name:            constInt_check
+# CHECK: registers:
+# CHECK-NEXT:  - { id: 0, class: gpr }
+# CHECK-NEXT:  - { id: 1, class: gpr }
+# CHECK-NEXT:  - { id: 2, class: gpr }
+# CHECK-NEXT:  - { id: 3, class: gpr }
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+  - { id: 3, class: _ }
+body:             |
+  bb.0 (%ir-block.0):
+    %0(s8) = G_CONSTANT i8 8
+    %1(s16) = G_CONSTANT i16 16
+    %2(s32) = G_CONSTANT i32 32
+    %3(s64) = G_CONSTANT i64 64
+    RET 0
 
+...
diff --git a/llvm/test/CodeGen/X86/GlobalISel/constant.ll b/llvm/test/CodeGen/X86/GlobalISel/constant.ll
new file mode 100644
index 00000000000..cab043a51f0
--- /dev/null
+++ b/llvm/test/CodeGen/X86/GlobalISel/constant.ll
@@ -0,0 +1,54 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=x86_64-linux-gnu -global-isel < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=X64
+
+define i8 @const_i8() {
+; ALL-LABEL: const_i8:
+; ALL:       # BB#0:
+; ALL-NEXT:    movb $2, %al
+; ALL-NEXT:    retq
+  ret i8 2
+}
+
+define i16 @const_i16() {
+; ALL-LABEL: const_i16:
+; ALL:       # BB#0:
+; ALL-NEXT:    movw $3, %ax
+; ALL-NEXT:    retq
+  ret i16 3
+}
+
+define i32 @const_i32() {
+; ALL-LABEL: const_i32:
+; ALL:       # BB#0:
+; ALL-NEXT:    movl $4, %eax
+; ALL-NEXT:    retq
+  ret i32 4
+}
+
+define i64 @const_i64() {
+; ALL-LABEL: const_i64:
+; ALL:       # BB#0:
+; ALL-NEXT:    movabsq $68719476720, %rax # imm = 0xFFFFFFFF0
+; ALL-NEXT:    retq
+  ret i64 68719476720
+}
+
+;i64 value fit into u32
+define i64 @const_i64_u32() {
+; ALL-LABEL: const_i64_u32:
+; ALL:       # BB#0:
+; ALL-NEXT:    movq $1879048192, %rax # imm = 0x70000000
+; ALL-NEXT:    retq
+  ret i64 1879048192
+}
+
+;i64 value fit into i32
+define i64 @const_i64_i32() {
+; ALL-LABEL: const_i64_i32:
+; ALL:       # BB#0:
+; ALL-NEXT:    movq $-1, %rax
+; ALL-NEXT:    retq
+  ret i64 -1
+}
+
+
diff --git a/llvm/test/CodeGen/X86/GlobalISel/select-constant.mir b/llvm/test/CodeGen/X86/GlobalISel/select-constant.mir
new file mode 100644
index 00000000000..f6b97b578b9
--- /dev/null
+++ b/llvm/test/CodeGen/X86/GlobalISel/select-constant.mir
@@ -0,0 +1,143 @@
+# RUN: llc -mtriple=x86_64-linux-gnu -global-isel -run-pass=instruction-select %s -o - | FileCheck %s --check-prefix=CHECK
+
+--- |
+  define i8 @const_i8() {
+    ret i8 2
+  }
+
+  define i16 @const_i16() {
+    ret i16 3
+  }
+
+  define i32 @const_i32() {
+    ret i32 4
+  }
+
+  define i64 @const_i64() {
+    ret i64 68719476720
+  }
+
+  define i64 @const_i64_u32() {
+    ret i64 1879048192
+  }
+
+  define i64 @const_i64_i32() {
+    ret i64 -1
+  }
+
+...
+---
+name:            const_i8
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK-LABEL: name:            const_i8
+# CHECK: registers:
+# CHECK-NEXT:  - { id: 0, class: gr8 }
+registers:
+  - { id: 0, class: gpr }
+# CHECK:  body:
+# CHECK:    %0 = MOV8ri 2
+body:             |
+  bb.1 (%ir-block.0):
+    %0(s8) = G_CONSTANT i8 2
+    %al = COPY %0(s8)
+    RET 0, implicit %al
+
+...
+---
+name:            const_i16
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK-LABEL: name:            const_i16
+# CHECK: registers:
+# CHECK-NEXT:  - { id: 0, class: gr16 }
+registers:
+  - { id: 0, class: gpr }
+# CHECK:  body:
+# CHECK:    %0 = MOV16ri 3
+body:             |
+  bb.1 (%ir-block.0):
+    %0(s16) = G_CONSTANT i16 3
+    %ax = COPY %0(s16)
+    RET 0, implicit %ax
+
+...
+---
+name:            const_i32
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK-LABEL: name:            const_i32
+# CHECK: registers:
+# CHECK-NEXT:  - { id: 0, class: gr32 }
+registers:
+  - { id: 0, class: gpr }
+# CHECK:  body:
+# CHECK:    %0 = MOV32ri 4
+body:             |
+  bb.1 (%ir-block.0):
+    %0(s32) = G_CONSTANT i32 4
+    %eax = COPY %0(s32)
+    RET 0, implicit %eax
+
+...
+---
+name:            const_i64
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK-LABEL: name:            const_i64
+# CHECK: registers:
+# CHECK-NEXT:  - { id: 0, class: gr64 }
+registers:
+  - { id: 0, class: gpr }
+# CHECK:  body:
+# CHECK:    %0 = MOV64ri 68719476720
+body:             |
+  bb.1 (%ir-block.0):
+    %0(s64) = G_CONSTANT i64 68719476720
+    %rax = COPY %0(s64)
+    RET 0, implicit %rax
+
+...
+---
+name:            const_i64_u32
+alignment:       4
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK-LABEL: name:            const_i64_u32
+# CHECK: registers:
+# CHECK-NEXT:  - { id: 0, class: gr64 }
+registers:
+  - { id: 0, class: gpr }
+# CHECK:  body:
+# CHECK:    %0 = MOV64ri32 1879048192
+body:             |
+  bb.1 (%ir-block.0):
+    %0(s64) = G_CONSTANT i64 1879048192
+    %rax = COPY %0(s64)
+    RET 0, implicit %rax
+
+...
+---
+name:            const_i64_i32
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK-LABEL: name:            const_i64_i32
+# CHECK: registers:
+# CHECK-NEXT:  - { id: 0, class: gr64 }
+registers:
+  - { id: 0, class: gpr }
+# CHECK:  body:
+# CHECK:    %0 = MOV64ri32 -1
+body:             |
+  bb.1 (%ir-block.0):
+    %0(s64) = G_CONSTANT i64 -1
+    %rax = COPY %0(s64)
+    RET 0, implicit %rax
+
+...