Remove support for building against LLVM 4

With emscripten removed in #55626, we no longer need to support
building against LLVM 4.

3 files changed, 26 insertions, 59 deletions

diff --git a/src/librustc_codegen_llvm/back/lto.rs b/src/librustc_codegen_llvm/back/lto.rs
index 8f940e0d22a..f04dde26e07 100644
--- a/src/librustc_codegen_llvm/back/lto.rs
+++ b/src/librustc_codegen_llvm/back/lto.rs
@@ -595,9 +595,7 @@ fn run_pass_manager(cgcx: &CodegenContext,
         };
         with_llvm_pmb(llmod, config, opt_level, false, &mut |b| {
             if thin {
-                if !llvm::LLVMRustPassManagerBuilderPopulateThinLTOPassManager(b, pm) {
-                    panic!("this version of LLVM does not support ThinLTO");
-                }
+                llvm::LLVMRustPassManagerBuilderPopulateThinLTOPassManager(b, pm);
             } else {
                 llvm::LLVMPassManagerBuilderPopulateLTOPassManager(b, pm,
                     /* Internalize = */ False,
diff --git a/src/librustc_codegen_llvm/builder.rs b/src/librustc_codegen_llvm/builder.rs
index 2fe6a0377f8..129305963c6 100644
--- a/src/librustc_codegen_llvm/builder.rs
+++ b/src/librustc_codegen_llvm/builder.rs
@@ -859,8 +859,7 @@ impl Builder<'a, 'll, 'tcx> {
             // FIXME: add a non-fast math version once
             // https://bugs.llvm.org/show_bug.cgi?id=36732
             // is fixed.
-            let instr = llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src)
-                .expect("LLVMRustBuildVectorReduceFAdd is not available in LLVM version < 5.0");
+            let instr = llvm::LLVMRustBuildVectorReduceFAdd(self.llbuilder, acc, src);
             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
             instr
         }
@@ -871,66 +870,43 @@ impl Builder<'a, 'll, 'tcx> {
             // FIXME: add a non-fast math version once
             // https://bugs.llvm.org/show_bug.cgi?id=36732
             // is fixed.
-            let instr = llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src)
-                .expect("LLVMRustBuildVectorReduceFMul is not available in LLVM version < 5.0");
+            let instr = llvm::LLVMRustBuildVectorReduceFMul(self.llbuilder, acc, src);
             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
             instr
         }
     }
     pub fn vector_reduce_add(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.add");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceAdd(self.llbuilder, src);
-            instr.expect("LLVMRustBuildVectorReduceAdd is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceAdd(self.llbuilder, src) }
     }
     pub fn vector_reduce_mul(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.mul");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceMul(self.llbuilder, src);
-            instr.expect("LLVMRustBuildVectorReduceMul is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceMul(self.llbuilder, src) }
     }
     pub fn vector_reduce_and(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.and");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceAnd(self.llbuilder, src);
-            instr.expect("LLVMRustBuildVectorReduceAnd is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceAnd(self.llbuilder, src) }
     }
     pub fn vector_reduce_or(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.or");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceOr(self.llbuilder, src);
-            instr.expect("LLVMRustBuildVectorReduceOr is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceOr(self.llbuilder, src) }
     }
     pub fn vector_reduce_xor(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.xor");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceXor(self.llbuilder, src);
-            instr.expect("LLVMRustBuildVectorReduceXor is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceXor(self.llbuilder, src) }
     }
     pub fn vector_reduce_fmin(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.fmin");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ false);
-            instr.expect("LLVMRustBuildVectorReduceFMin is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ false) }
     }
     pub fn vector_reduce_fmax(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.fmax");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ false);
-            instr.expect("LLVMRustBuildVectorReduceFMax is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ false) }
     }
     pub fn vector_reduce_fmin_fast(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.fmin_fast");
         unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ true)
-                .expect("LLVMRustBuildVectorReduceFMin is not available in LLVM version < 5.0");
+            let instr = llvm::LLVMRustBuildVectorReduceFMin(self.llbuilder, src, /*NoNaNs:*/ true);
             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
             instr
         }
@@ -938,25 +914,18 @@ impl Builder<'a, 'll, 'tcx> {
     pub fn vector_reduce_fmax_fast(&self, src: &'ll Value) -> &'ll Value {
         self.count_insn("vector.reduce.fmax_fast");
         unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ true)
-                .expect("LLVMRustBuildVectorReduceFMax is not available in LLVM version < 5.0");
+            let instr = llvm::LLVMRustBuildVectorReduceFMax(self.llbuilder, src, /*NoNaNs:*/ true);
             llvm::LLVMRustSetHasUnsafeAlgebra(instr);
             instr
         }
     }
     pub fn vector_reduce_min(&self, src: &'ll Value, is_signed: bool) -> &'ll Value {
         self.count_insn("vector.reduce.min");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceMin(self.llbuilder, src, is_signed);
-            instr.expect("LLVMRustBuildVectorReduceMin is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceMin(self.llbuilder, src, is_signed) }
     }
     pub fn vector_reduce_max(&self, src: &'ll Value, is_signed: bool) -> &'ll Value {
         self.count_insn("vector.reduce.max");
-        unsafe {
-            let instr = llvm::LLVMRustBuildVectorReduceMax(self.llbuilder, src, is_signed);
-            instr.expect("LLVMRustBuildVectorReduceMax is not available in LLVM version < 5.0")
-        }
+        unsafe { llvm::LLVMRustBuildVectorReduceMax(self.llbuilder, src, is_signed) }
     }
 
     pub fn extract_value(&self, agg_val: &'ll Value, idx: u64) -> &'ll Value {
diff --git a/src/librustc_codegen_llvm/llvm/ffi.rs b/src/librustc_codegen_llvm/llvm/ffi.rs
index 12d4670e4be..9a4b94eda7a 100644
--- a/src/librustc_codegen_llvm/llvm/ffi.rs
+++ b/src/librustc_codegen_llvm/llvm/ffi.rs
@@ -1041,42 +1041,42 @@ extern "C" {
     pub fn LLVMRustBuildVectorReduceFAdd(B: &Builder<'a>,
                                          Acc: &'a Value,
                                          Src: &'a Value)
-                                         -> Option<&'a Value>;
+                                         -> &'a Value;
     pub fn LLVMRustBuildVectorReduceFMul(B: &Builder<'a>,
                                          Acc: &'a Value,
                                          Src: &'a Value)
-                                         -> Option<&'a Value>;
+                                         -> &'a Value;
     pub fn LLVMRustBuildVectorReduceAdd(B: &Builder<'a>,
                                         Src: &'a Value)
-                                        -> Option<&'a Value>;
+                                        -> &'a Value;
     pub fn LLVMRustBuildVectorReduceMul(B: &Builder<'a>,
                                         Src: &'a Value)
-                                        -> Option<&'a Value>;
+                                        -> &'a Value;
     pub fn LLVMRustBuildVectorReduceAnd(B: &Builder<'a>,
                                         Src: &'a Value)
-                                        -> Option<&'a Value>;
+                                        -> &'a Value;
     pub fn LLVMRustBuildVectorReduceOr(B: &Builder<'a>,
                                        Src: &'a Value)
-                                       -> Option<&'a Value>;
+                                       -> &'a Value;
     pub fn LLVMRustBuildVectorReduceXor(B: &Builder<'a>,
                                         Src: &'a Value)
-                                        -> Option<&'a Value>;
+                                        -> &'a Value;
     pub fn LLVMRustBuildVectorReduceMin(B: &Builder<'a>,
                                         Src: &'a Value,
                                         IsSigned: bool)
-                                        -> Option<&'a Value>;
+                                        -> &'a Value;
     pub fn LLVMRustBuildVectorReduceMax(B: &Builder<'a>,
                                         Src: &'a Value,
                                         IsSigned: bool)
-                                        -> Option<&'a Value>;
+                                        -> &'a Value;
     pub fn LLVMRustBuildVectorReduceFMin(B: &Builder<'a>,
                                          Src: &'a Value,
                                          IsNaN: bool)
-                                         -> Option<&'a Value>;
+                                         -> &'a Value;
     pub fn LLVMRustBuildVectorReduceFMax(B: &Builder<'a>,
                                          Src: &'a Value,
                                          IsNaN: bool)
-                                         -> Option<&'a Value>;
+                                         -> &'a Value;
 
     pub fn LLVMRustBuildMinNum(
         B: &Builder<'a>,
@@ -1157,7 +1157,7 @@ extern "C" {
                                                         RunInliner: Bool);
     pub fn LLVMRustPassManagerBuilderPopulateThinLTOPassManager(
         PMB: &PassManagerBuilder,
-        PM: &PassManager) -> bool;
+        PM: &PassManager);
 
     // Stuff that's in rustllvm/ because it's not upstream yet.