Rebased PNaCl localmods in LLVM to 223109

test/Transforms/NaCl/promote-i1-ops.ll

+; RUN: opt %s -nacl-promote-i1-ops -S | FileCheck %s
+
+; Test that the PromoteI1Ops pass expands out i1 loads/stores and i1
+; comparison and arithmetic operations, with the exception of "and",
+; "or" and "xor".
+
+
+; i1 loads and stores are converted to i8 load and stores with
+; explicit casts.
+
+define i1 @load(i1* %ptr) {
+  %val = load i1* %ptr
+  ret i1 %val
+}
+; CHECK: define i1 @load
+; CHECK-NEXT: %ptr.i8ptr = bitcast i1* %ptr to i8*
+; CHECK-NEXT: %val.pre_trunc = load i8* %ptr.i8ptr
+; CHECK-NEXT: %val = trunc i8 %val.pre_trunc to i1
+
+define void @store(i1 %val, i1* %ptr) {
+  store i1 %val, i1* %ptr
+  ret void
+}
+; CHECK: define void @store
+; CHECK-NEXT: %ptr.i8ptr = bitcast i1* %ptr to i8*
+; CHECK-NEXT: %val.expand_i1_val = zext i1 %val to i8
+; CHECK-NEXT: store i8 %val.expand_i1_val, i8* %ptr.i8ptr
+
+
+; i1 arithmetic and comparisons are converted to their i8 equivalents
+; with explicit casts.
+
+define i1 @add(i1 %x, i1 %y) {
+  %result = add i1 %x, %y
+  ret i1 %result
+}
+; CHECK: define i1 @add
+; CHECK-NEXT: %x.expand_i1_val = zext i1 %x to i8
+; CHECK-NEXT: %y.expand_i1_val = zext i1 %y to i8
+; CHECK-NEXT: %result.pre_trunc = add i8 %x.expand_i1_val, %y.expand_i1_val
+; CHECK-NEXT: %result = trunc i8 %result.pre_trunc to i1
+
+define i1 @compare(i1 %x, i1 %y) {
+  %result = icmp slt i1 %x, %y
+  ret i1 %result
+}
+; CHECK: define i1 @compare
+; CHECK-NEXT: %x.expand_i1_val = sext i1 %x to i8
+; CHECK-NEXT: %y.expand_i1_val = sext i1 %y to i8
+; CHECK-NEXT: %result = icmp slt i8 %x.expand_i1_val, %y.expand_i1_val
+
+
+; Non-shift bitwise operations should not be modified.
+define void @bitwise_ops(i1 %x, i1 %y) {
+  %and = and i1 %x, %y
+  %or = or i1 %x, %y
+  %xor = xor i1 %x, %y
+  ret void
+}
+; CHECK: define void @bitwise_ops
+; CHECK-NEXT: %and = and i1 %x, %y
+; CHECK-NEXT: %or = or i1 %x, %y
+; CHECK-NEXT: %xor = xor i1 %x, %y
+
+
+define void @unchanged_cases(i32 %x, i32 %y, i32* %ptr) {
+  %add = add i32 %x, %y
+  %cmp = icmp slt i32 %x, %y
+  %val = load i32* %ptr
+  store i32 %x, i32* %ptr
+  ret void
+}
+; CHECK: define void @unchanged_cases
+; CHECK-NEXT: %add = add i32 %x, %y
+; CHECK-NEXT: %cmp = icmp slt i32 %x, %y
+; CHECK-NEXT: %val = load i32* %ptr
+; CHECK-NEXT: store i32 %x, i32* %ptr
+
+define void @i1_switch(i1 %a) {
+entry:
+  switch i1 %a, label %impossible [
+    i1 true, label %truedest
+    i1 false, label %falsedest
+  ]
+
+impossible:
+  %phi = phi i32 [ 123, %entry ]
+  unreachable
+
+truedest:
+  unreachable
+
+falsedest:
+  unreachable
+}
+; CHECK-LABEL: define void @i1_switch
+; CHECK-LABEL: entry:
+; CHECK-NEXT:    br i1 %a, label %truedest, label %falsedest
+; CHECK-LABEL: impossible:
+; CHECK-NEXT:    unreachable
+; CHECK-LABEL: truedest:
+; CHECK-NEXT:    unreachable
+; CHECK-LABEL: falsedest:
+; CHECK-NEXT:    unreachable
+
+define void @i1_switch_default_true(i1 %a) {
+entry:
+  switch i1 %a, label %truedest [
+    i1 false, label %falsedest
+  ]
+
+truedest:
+  unreachable
+falsedest:
+  unreachable
+}
+; CHECK-LABEL: define void @i1_switch_default_true(i1 %a)
+; CHECK-LABEL: entry:
+; CHECK-NEXT:    br i1 %a, label %truedest, label %falsedest
+; CHECK-LABEL: truedest:
+; CHECK-NEXT:    unreachable
+; CHECK-LABEL: falsedest:
+; CHECK-NEXT:    unreachable
+
+define void @i1_switch_default_false(i1 %a) {
+entry:
+  switch i1 %a, label %falsedest [
+    i1 true, label %truedest
+  ]
+
+truedest:
+  unreachable
+falsedest:
+  unreachable
+}
+; CHECK-LABEL: define void @i1_switch_default_false(i1 %a)
+; CHECK-LABEL: entry:
+; CHECK-NEXT:    br i1 %a, label %truedest, label %falsedest
+; CHECK-LABEL: truedest:
+; CHECK-NEXT:    unreachable
+; CHECK-LABEL: falsedest:
+; CHECK-NEXT:    unreachable
+