Vendor import of llvm trunk r238337:vendor/llvm/llvm-trunk-r238337

https://llvm.org/svn/llvm-project/llvm/trunk@238337

1 files changed, 52 insertions, 0 deletions

diff --git a/test/CodeGen/X86/cmov-double.ll b/test/CodeGen/X86/cmov-double.ll
new file mode 100644
index 000000000000..994a027596c6
--- /dev/null
+++ b/test/CodeGen/X86/cmov-double.ll
@@ -0,0 +1,52 @@
+; RUN: llc -o - %s | FileCheck %s
+target triple = "x86_64-unknown-unknown"
+
+; select with and i1/or i1 condition should be implemented as a series of 2
+; cmovs, not by producing two conditions and using and on them.
+
+define i32 @select_and(i32 %a0, i32 %a1, float %a2, float %a3, i32 %a4, i32 %a5) {
+; CHECK-LABEL: select_and
+; CHECK-NOT: set
+; CHECK-NOT: and[lb]
+; CHECK-NOT: test
+; CHECK: cmov
+; CHECK: cmov
+  %cmp0 = icmp ult i32 %a0, %a1
+  %cmp1 = fcmp olt float %a2, %a3
+  %and = and i1 %cmp0, %cmp1
+  %res = select i1 %and, i32 %a4, i32 %a5
+  ret i32 %res
+}
+
+define i32 @select_or(i32 %a0, i32 %a1, float %a2, float %a3, i32 %a4, i32 %a5) {
+; select with and i1 condition should be implemented as a series of 2 cmovs, not
+; by producing two conditions and using and on them.
+; CHECK-LABEL: select_or
+; CHECK-NOT: set
+; CHECK-NOT: or[lb]
+; CHECK-NOT: test
+; CHECK: cmov
+; CHECK: cmov
+  %cmp0 = icmp ult i32 %a0, %a1
+  %cmp1 = fcmp olt float %a2, %a3
+  %and = or i1 %cmp0, %cmp1
+  %res = select i1 %and, i32 %a4, i32 %a5
+  ret i32 %res
+}
+
+; If one of the conditions is materialized as a 0/1 value anyway, then the
+; sequence of 2 cmovs should not be used.
+
+@var32 = global i32 0
+define i32 @select_noopt(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
+; CHECK-LABEL: select_noopt
+; CHECK: cmov
+; CHECK-NOT: cmov
+  %cmp0 = icmp ult i32 %a0, %a1
+  %cmp1 = icmp ult i32 %a1, %a2
+  %or = or i1 %cmp0, %cmp1
+  %zero_one = zext i1 %or to i32
+  store volatile i32 %zero_one, i32* @var32
+  %res = select i1 %or, i32 %a3, i32 %a4
+  ret i32 %res
+}