Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/CodeGen/Mips/compactbranches/compact-branch-policy.ll

@@ -0,0 +1,28 @@
+; Check that -mips-compact-branches={never,optimal,always} is accepted and honoured.
+; RUN: llc -march=mips -mcpu=mips32r6 -mips-compact-branches=never < %s | FileCheck %s -check-prefix=NEVER
+; RUN: llc -march=mips -mcpu=mips32r6 -mips-compact-branches=optimal < %s | FileCheck %s -check-prefix=OPTIMAL
+; RUN: llc -march=mips -mcpu=mips32r6 -mips-compact-branches=always < %s | FileCheck %s -check-prefix=ALWAYS
+
+define i32 @l(i32 signext %a, i32 signext %b) {
+entry:
+  %add = add nsw i32 %b, %a
+  %cmp = icmp slt i32 %add, 100
+; NEVER: beq
+; OPTIMAL: beq
+; ALWAYS: beqzc
+; This nop is required for correct as having (j|b)al as the instruction
+; immediately following beqzc would cause a forbidden slot hazard.
+; ALWAYS: nop
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %call = tail call i32 @k()
+  br label %if.end
+
+if.end:                                           ; preds = %entry, %if.then
+  %call.pn = phi i32 [ %call, %if.then ], [ -1, %entry ]
+  %c.0 = add nsw i32 %call.pn, %add
+  ret i32 %c.0
+}
+
+declare i32 @k() #1