Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

external/llvm/test/Transforms/DeadArgElim/musttail-caller.ll

@@ -0,0 +1,16 @@
+; RUN: opt -deadargelim -S < %s | FileCheck %s
+; PR36441
+; Dead arguments should not be removed in presence of `musttail` calls.
+
+; CHECK-LABEL: define internal void @test(i32 %a, i32 %b)
+; CHECK: musttail call void @foo(i32 %a, i32 0)
+; FIXME: we should replace those with `undef`s
+define internal void @test(i32 %a, i32 %b) {
+  musttail call void @foo(i32 %a, i32 0)
+  ret void
+}
+
+; CHECK-LABEL: define internal void @foo(i32 %a, i32 %b)
+define internal void @foo(i32 %a, i32 %b) {
+  ret void
+}

external/llvm/test/Transforms/InstCombine/gep-addrspace.ll

@@ -32,3 +32,22 @@ entry:
   ret void
 }
 
+declare void @escape_alloca(i16*)
+
+; check that addrspacecast is not ignored (leading to an assertion failure)
+; when trying to mark a GEP as inbounds
+define { i8, i8 } @inbounds_after_addrspacecast() {
+top:
+; CHECK-LABEL: @inbounds_after_addrspacecast
+  %0 = alloca i16, align 2
+  call void @escape_alloca(i16* %0)
+  %tmpcast = bitcast i16* %0 to [2 x i8]*
+; CHECK: addrspacecast [2 x i8]* %tmpcast to [2 x i8] addrspace(11)*
+  %1 = addrspacecast [2 x i8]* %tmpcast to [2 x i8] addrspace(11)*
+; CHECK: getelementptr [2 x i8], [2 x i8] addrspace(11)* %1, i64 0, i64 1
+  %2 = getelementptr [2 x i8], [2 x i8] addrspace(11)* %1, i64 0, i64 1
+; CHECK: addrspace(11)
+  %3 = load i8, i8 addrspace(11)* %2, align 1
+  %.fca.1.insert = insertvalue { i8, i8 } zeroinitializer, i8 %3, 1
+  ret { i8, i8 } %.fca.1.insert
+}

external/llvm/test/Transforms/JumpThreading/header-succ.ll

@@ -0,0 +1,99 @@
+; RUN: opt -S -jump-threading < %s | FileCheck %s
+
+; Check that the heuristic for avoiding accidental introduction of irreducible
+; loops doesn't also prevent us from threading simple constructs where this
+; isn't a problem.
+
+declare void @opaque_body()
+
+define void @jump_threading_loopheader() {
+; CHECK-LABEL: @jump_threading_loopheader
+top:
+    br label %entry
+
+entry:
+    %ind = phi i32 [0, %top], [%nextind, %latch]
+    %nextind = add i32 %ind, 1
+    %cmp = icmp ule i32 %ind, 10
+; CHECK: br i1 %cmp, label %latch, label %exit
+    br i1 %cmp, label %body, label %latch
+
+body:
+    call void @opaque_body()
+; CHECK: br label %entry
+    br label %latch
+
+latch:
+    %cond = phi i2 [1, %entry], [2, %body]
+    switch i2 %cond, label %unreach [
+        i2 2, label %entry
+        i2 1, label %exit
+    ]
+
+unreach:
+    unreachable
+
+exit:
+    ret void
+}
+
+; We also need to check the opposite order of the branches, in the switch
+; instruction because jump-threading relies on that to decide which edge to
+; try to thread first.
+define void @jump_threading_loopheader2() {
+; CHECK-LABEL: @jump_threading_loopheader2
+top:
+    br label %entry
+
+entry:
+    %ind = phi i32 [0, %top], [%nextind, %latch]
+    %nextind = add i32 %ind, 1
+    %cmp = icmp ule i32 %ind, 10
+; CHECK: br i1 %cmp, label %exit, label %latch
+    br i1 %cmp, label %body, label %latch
+
+body:
+    call void @opaque_body()
+; CHECK: br label %entry
+    br label %latch
+
+latch:
+    %cond = phi i2 [1, %entry], [2, %body]
+    switch i2 %cond, label %unreach [
+        i2 1, label %entry
+        i2 2, label %exit
+    ]
+
+unreach:
+    unreachable
+
+exit:
+    ret void
+}
+
+; Check if we can handle undef branch condition.
+define void @jump_threading_loopheader3() {
+; CHECK-LABEL: @jump_threading_loopheader3
+top:
+    br label %entry
+
+entry:
+    %ind = phi i32 [0, %top], [%nextind, %latch]
+    %nextind = add i32 %ind, 1
+    %cmp = icmp ule i32 %ind, 10
+; CHECK: br i1 %cmp, label %latch, label %exit
+    br i1 %cmp, label %body, label %latch
+
+body:
+    call void @opaque_body()
+; CHECK: br label %entry
+    br label %latch
+
+latch:
+   %phi = phi i32 [undef, %entry], [0, %body]
+   %cmp1 = icmp eq i32 %phi, 0
+   br i1 %cmp1, label %entry, label %exit
+
+exit:
+    ret void
+}

external/llvm/test/Transforms/MergeFunc/inline-asm.ll

@@ -0,0 +1,53 @@
+; RUN: opt -mergefunc -S < %s | FileCheck %s
+
+; CHECK-LABEL: @int_ptr_arg_different
+; CHECK-NEXT: call void asm
+
+; CHECK-LABEL: @int_ptr_arg_same
+; CHECK-NEXT: %2 = bitcast i32* %0 to float*
+; CHECK-NEXT: tail call void @float_ptr_arg_same(float* %2)
+
+; CHECK-LABEL: @int_ptr_null
+; CHECK-NEXT: tail call void @float_ptr_null()
+
+; Used to satisfy minimum size limit
+declare void @stuff()
+
+; Can be merged
+define void @float_ptr_null() {
+  call void asm "nop", "r"(float* null)
+  call void @stuff()
+  ret void
+}
+
+define void @int_ptr_null() {
+  call void asm "nop", "r"(i32* null)
+  call void @stuff()
+  ret void
+}
+
+; Can be merged (uses same argument differing by pointer type)
+define void @float_ptr_arg_same(float*) {
+  call void asm "nop", "r"(float* %0)
+  call void @stuff()
+  ret void
+}
+
+define void @int_ptr_arg_same(i32*) {
+  call void asm "nop", "r"(i32* %0)
+  call void @stuff()
+  ret void
+}
+
+; Can not be merged (uses different arguments)
+define void @float_ptr_arg_different(float*, float*) {
+  call void asm "nop", "r"(float* %0)
+  call void @stuff()
+  ret void
+}
+
+define void @int_ptr_arg_different(i32*, i32*) {
+  call void asm "nop", "r"(i32* %1)
+  call void @stuff()
+  ret void
+}

external/llvm/test/Transforms/MergeFunc/weak-small.ll

@@ -0,0 +1,16 @@
+; RUN: opt -mergefunc -S < %s | FileCheck %s
+
+; Weak functions too small for merging to be profitable
+
+; CHECK: define weak i32 @foo(i8*, i32)
+; CHECK-NEXT: ret i32 %1
+; CHECK: define weak i32 @bar(i8*, i32)
+; CHECK-NEXT: ret i32 %1
+
+define weak i32 @foo(i8*, i32) #0 {
+    ret i32 %1
+}
+
+define weak i32 @bar(i8*, i32) #0 {
+    ret i32 %1
+}