[GlobalIsel][X86] support G_TRUNC selection.

Summary:
[GlobalIsel][X86] support G_TRUNC selection.
Add regbank-select and legalizer tests. Currently legalization of trunc i64 on 32bit platform not supported.

Reviewers: ab, zvi, rovka

Reviewed By: zvi

Subscribers: dberris, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D32115

llvm-svn: 300678

1 files changed, 57 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/GlobalISel/trunc.ll b/llvm/test/CodeGen/X86/GlobalISel/trunc.ll
new file mode 100644
index 00000000000..a56fc3b5a87
--- /dev/null
+++ b/llvm/test/CodeGen/X86/GlobalISel/trunc.ll
@@ -0,0 +1,57 @@
+; 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=CHECK
+
+define i1 @trunc_i32toi1(i32 %a) {
+; CHECK-LABEL: trunc_i32toi1:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    retq
+  %r = trunc i32 %a to i1
+  ret i1 %r
+}
+
+define i8 @trunc_i32toi8(i32 %a) {
+; CHECK-LABEL: trunc_i32toi8:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    retq
+  %r = trunc i32 %a to i8
+  ret i8 %r
+}
+
+define i16 @trunc_i32toi16(i32 %a) {
+; CHECK-LABEL: trunc_i32toi16:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    retq
+  %r = trunc i32 %a to i16
+  ret i16 %r
+}
+
+define i8 @trunc_i64toi8(i64 %a) {
+; CHECK-LABEL: trunc_i64toi8:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    retq
+  %r = trunc i64 %a to i8
+  ret i8 %r
+}
+
+define i16 @trunc_i64toi16(i64 %a) {
+; CHECK-LABEL: trunc_i64toi16:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    retq
+  %r = trunc i64 %a to i16
+  ret i16 %r
+}
+
+define i32 @trunc_i64toi32(i64 %a) {
+; CHECK-LABEL: trunc_i64toi32:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    retq
+  %r = trunc i64 %a to i32
+  ret i32 %r
+}
+