[SystemZ] Add CodeGen test cases

This adds all CodeGen tests for the SystemZ target.

This version of the patch incorporates feedback from a review by
Sean Silva.  Thanks to all reviewers!

Patch by Richard Sandiford.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181204 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 220 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/int-cmp-20.ll b/test/CodeGen/SystemZ/int-cmp-20.ll
new file mode 100644
index 0000000000..8fffbc86a7
--- /dev/null
+++ b/test/CodeGen/SystemZ/int-cmp-20.ll
@@ -0,0 +1,220 @@
+; Test 32-bit ordered comparisons that are really between a memory byte
+; and a constant.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check unsigned comparison near the low end of the CLI range, using zero
+; extension.
+define double @f1(double %a, double %b, i8 *%ptr) {
+; CHECK: f1:
+; CHECK: cli 0(%r2), 1
+; CHECK-NEXT: j{{g?}}h
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = zext i8 %val to i32
+  %cond = icmp ugt i32 %ext, 1
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check unsigned comparison near the low end of the CLI range, using sign
+; extension.
+define double @f2(double %a, double %b, i8 *%ptr) {
+; CHECK: f2:
+; CHECK: cli 0(%r2), 1
+; CHECK-NEXT: j{{g?}}h
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp ugt i32 %ext, 1
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check unsigned comparison near the high end of the CLI range, using zero
+; extension.
+define double @f3(double %a, double %b, i8 *%ptr) {
+; CHECK: f3:
+; CHECK: cli 0(%r2), 254
+; CHECK-NEXT: j{{g?}}l
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = zext i8 %val to i32
+  %cond = icmp ult i32 %ext, 254
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check unsigned comparison near the high end of the CLI range, using sign
+; extension.
+define double @f4(double %a, double %b, i8 *%ptr) {
+; CHECK: f4:
+; CHECK: cli 0(%r2), 254
+; CHECK-NEXT: j{{g?}}l
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp ult i32 %ext, -2
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check unsigned comparison above the high end of the CLI range, using zero
+; extension.  The condition is always true.
+define double @f5(double %a, double %b, i8 *%ptr) {
+; CHECK: f5:
+; CHECK-NOT: cli
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = zext i8 %val to i32
+  %cond = icmp ult i32 %ext, 256
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; When using unsigned comparison with sign extension, equality with values
+; in the range [128, MAX-129] is impossible, and ordered comparisons with
+; those values are effectively sign tests.  Since such comparisons are
+; unlikely to occur in practice, we don't bother optimizing the second case,
+; and simply ignore CLI for this range.  First check the low end of the range.
+define double @f6(double %a, double %b, i8 *%ptr) {
+; CHECK: f6:
+; CHECK-NOT: cli
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp ult i32 %ext, 128
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; ...and then the high end.
+define double @f7(double %a, double %b, i8 *%ptr) {
+; CHECK: f7:
+; CHECK-NOT: cli
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp ult i32 %ext, -129
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check signed comparison near the low end of the CLI range, using zero
+; extension.  This is equivalent to unsigned comparison.
+define double @f8(double %a, double %b, i8 *%ptr) {
+; CHECK: f8:
+; CHECK: cli 0(%r2), 1
+; CHECK-NEXT: j{{g?}}h
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = zext i8 %val to i32
+  %cond = icmp sgt i32 %ext, 1
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check signed comparison near the low end of the CLI range, using sign
+; extension.  This cannot use CLI.
+define double @f9(double %a, double %b, i8 *%ptr) {
+; CHECK: f9:
+; CHECK-NOT: cli
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp sgt i32 %ext, 1
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check signed comparison near the high end of the CLI range, using zero
+; extension.  This is equivalent to unsigned comparison.
+define double @f10(double %a, double %b, i8 *%ptr) {
+; CHECK: f10:
+; CHECK: cli 0(%r2), 254
+; CHECK-NEXT: j{{g?}}l
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = zext i8 %val to i32
+  %cond = icmp slt i32 %ext, 254
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check signed comparison near the high end of the CLI range, using sign
+; extension.  This cannot use CLI.
+define double @f11(double %a, double %b, i8 *%ptr) {
+; CHECK: f11:
+; CHECK-NOT: cli
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp slt i32 %ext, -2
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check signed comparison above the high end of the CLI range, using zero
+; extension.  The condition is always true.
+define double @f12(double %a, double %b, i8 *%ptr) {
+; CHECK: f12:
+; CHECK-NOT: cli
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = zext i8 %val to i32
+  %cond = icmp slt i32 %ext, 256
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check tests for nonnegative values.
+define double @f13(double %a, double %b, i8 *%ptr) {
+; CHECK: f13:
+; CHECK: cli 0(%r2), 128
+; CHECK-NEXT: j{{g?}}l
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp sge i32 %ext, 0
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; ...and another form
+define double @f14(double %a, double %b, i8 *%ptr) {
+; CHECK: f14:
+; CHECK: cli 0(%r2), 128
+; CHECK-NEXT: j{{g?}}l
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp sgt i32 %ext, -1
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; Check tests for negative values.
+define double @f15(double %a, double %b, i8 *%ptr) {
+; CHECK: f15:
+; CHECK: cli 0(%r2), 127
+; CHECK-NEXT: j{{g?}}h
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp slt i32 %ext, 0
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}
+
+; ...and another form
+define double @f16(double %a, double %b, i8 *%ptr) {
+; CHECK: f16:
+; CHECK: cli 0(%r2), 127
+; CHECK-NEXT: j{{g?}}h
+; CHECK: br %r14
+  %val = load i8 *%ptr
+  %ext = sext i8 %val to i32
+  %cond = icmp sle i32 %ext, -1
+  %res = select i1 %cond, double %a, double %b
+  ret double %res
+}