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=1 \
+; RUN:   | FileCheck --check-prefix=NONSFI %s
+; RUN: %p2i -i %s --filetype=obj --assemble --disassemble --args -O2 -nonsfi=0 \
+; RUN:   | FileCheck --check-prefix=DEFAULT %s
+
+@G1 = internal global [4 x i8] zeroinitializer, align 4
+@G2 = 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.
+; NONSFI-LABEL: testCallRegular
+; NONSFI: call {{.*}} R_386_PC32 testCallRegular
+; DEFAULT-LABEL: testCallRegular
+
+define internal double @testCallBuiltin(double %val) {
+entry:
+  %result = frem double %val, %val
+  ret double %result
+}
+; Expect a simple direct call to fmod.
+; NONSFI-LABEL: testCallBuiltin
+; NONSFI: call {{.*}} R_386_PC32 fmod
+; DEFAULT-LABEL: testCallBuiltin
+
+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.
+; NONSFI-LABEL: testLoadBasic
+; NONSFI: mov {{.*}} R_386_GOTOFF G1
+; DEFAULT-LABEL: testLoadBasic
+
+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.
+; NONSFI-LABEL: testLoadFixedOffset
+; NONSFI: mov {{.*}}+0x4] {{.*}} R_386_GOTOFF G1
+; DEFAULT-LABEL: testLoadFixedOffset
+
+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
+}
+; Expect a load with a R_386_GOTOFF relocation plus an immediate offset, plus a
+; scaled index register.
+; NONSFI-LABEL: testLoadIndexed
+; NONSFI: mov {{.*}}*4+0xc] {{.*}} R_386_GOTOFF G1
+; DEFAULT-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, %base
+  %a2 = add i32 %a1, %a
+  %a3 = add i32 %a2, 12
+  %a4 = inttoptr i32 %a3 to i32*
+  %b = load i32, i32* %a4, align 1
+  ret i32 %b
+}
+; Expect a load with a R_386_GOTOFF relocation plus an immediate offset, but
+; without the scaled index.
+; NONSFI-LABEL: testLoadIndexedBase
+; NONSFI: mov {{.*}}*1+0xc] {{.*}} R_386_GOTOFF G1
+; By contrast, without -nonsfi, expect a load with a *R_386_32* relocation plus
+; an immediate offset, and *with* the scaled index.
+; DEFAULT-LABEL: testLoadIndexedBase
+; DEFAULT: mov {{.*}},DWORD PTR [{{.*}}+{{.*}}*4+0xc] {{.*}} R_386_32 G1
+
+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]* @G2 to i32*
+  %d = load i32, i32* %c, align 1
+  %e = add i32 %b, %d
+  ret i32 %e
+}
+; Expect a load-folding optimization with a R_386_GOTOFF relocation.
+; NONSFI-LABEL: testLoadOpt
+; NONSFI: mov [[REG:e..]],{{.*}}+0x0] {{.*}} R_386_GOTOFF G1
+; NONSFI-NEXT: add [[REG]],{{.*}}+0x0] {{.*}} R_386_GOTOFF G2
+; DEFAULT-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, 1234
+  store i32 %c, i32* %a, align 1
+  ret void
+}
+; Expect an RMW optimization with a R_386_GOTOFF relocation.
+; NONSFI-LABEL: testRMW
+; NONSFI: add DWORD PTR {{.*}}+0x0],0x4d2 {{.*}} R_386_GOTOFF G1
+; DEFAULT-LABEL: testRMW