Subzero: Add Non-SFI support for x86-32.

tests_lit/llvm2ice_tests/nonsfi.ll

+; RUN: %p2i -i %s --filetype=obj --assemble --disassemble --args -O2 -nonsfi \
+; RUN:   | FileCheck %s
+
+@G1 = internal global [4 x i8] zeroinitializer, align 4
+
+define internal void @testCallRegular() {
+entry:
+  call void @testCallRegular()
+  ret void
+}
+; Expect a simple direct call to testCallRegular.
+; CHECK-LABEL: testCallRegular
+; CHECK: call {{.*}} R_386_PC32 testCallRegular
+
+define internal double @testCallBuiltin(double %val) {
+entry:
+  %result = frem double %val, %val
+  ret double %result
+}
+; Expect a simple direct call to fmod.
+; CHECK-LABEL: testCallBuiltin
+; CHECK: call {{.*}} R_386_PC32 fmod
+
+define internal i32 @testLoadBasic() {
+entry:
+  %a = bitcast [4 x i8]* @G1 to i32*
+  %b = load i32, i32* %a, align 1
+  ret i32 %b
+}
+; Expect a load with a R_386_GOTOFF relocation.
+; CHECK-LABEL: testLoadBasic
+; CHECK: mov {{.*}} R_386_GOTOFF G1
+
+define internal i32 @testLoadFixedOffset() {
+entry:
+  %a = ptrtoint [4 x i8]* @G1 to i32
+  %a1 = add i32 %a, 4
+  %a2 = inttoptr i32 %a1 to i32*
+  %b = load i32, i32* %a2, align 1
+  ret i32 %b
+}
+; Expect a load with a R_386_GOTOFF relocation plus an immediate offset.
+; CHECK-LABEL: testLoadFixedOffset
+; CHECK: mov {{.*}}+0x4] {{.*}} R_386_GOTOFF G1
+
+define internal i32 @testLoadIndexed(i32 %idx) {
+entry:
+  %a = ptrtoint [4 x i8]* @G1 to i32
+  %a0 = mul i32 %idx, 4
+  %a1 = add i32 %a0, 12
+  %a2 = add i32 %a1, %a
+  %a3 = inttoptr i32 %a2 to i32*
+  %b = load i32, i32* %a3, align 1
+  ret i32 %b
+}
+; CHECK-LABEL: testLoadIndexed
+
+define internal i32 @testLoadIndexedBase(i32 %base, i32 %idx) {
+entry:
+  %a = ptrtoint [4 x i8]* @G1 to i32
+  %a0 = mul i32 %idx, 4
+  %a1 = add i32 %a0, 12
+  %a2 = add i32 %a1, %a
+  %a3 = add i32 %a2, %base
+  %a4 = inttoptr i32 %a3 to i32*
+  %b = load i32, i32* %a4, align 1
+  ret i32 %b
+}
+; CHECK-LABEL: testLoadIndexedBase
+
+define internal i32 @testLoadOpt() {
+entry:
+  %a = bitcast [4 x i8]* @G1 to i32*
+  %b = load i32, i32* %a, align 1
+  %c = bitcast [4 x i8]* @G1 to i32*
+  %d = load i32, i32* %a, align 1
+  %e = add i32 %b, %d
+  ret i32 %e
+}
+; Expect a load-folding optimization with a R_386_GOTOFF relocation.
+; CHECK-LABEL: testLoadOpt
+
+define internal void @testRMW() {
+entry:
+  %a = bitcast [4 x i8]* @G1 to i32*
+  %b = load i32, i32* %a, align 1
+  %c = add i32 %b, 1
+  store i32 %c, i32* %a, align 1
+  ret void
+}
+; Expect an RMW optimization with a R_386_GOTOFF relocation.
+; CHECK-LABEL: testRMW