PNaCl: Disable parts of InstCombine that introduce *.with.overflow intrinsics

Change the PNaCl ABI checker to disallow these intrinsics.

Note that I had originally intended to commit this before my earlier
change (https://codereview.chromium.org/15688011) that enables the
ExpandArithWithOverflow pass.  Enabling ExpandArithWithOverflow
without changing InstCombine causes ExpandArithWithOverflow to fail on
some of the *.with.overflow intrinsic calls that InstCombine
introduces.  This change therefore fixes some breakage.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3434
TEST=PNaCl toolchain trybots + GCC torture tests + LLVM test suite

Review URL: https://codereview.chromium.org/16042011

1 files changed, 17 insertions, 8 deletions

diff --git a/test/Transforms/InstCombine/overflow.ll b/test/Transforms/InstCombine/overflow.ll
index 81ceef8c41..d8e3be3c94 100644
--- a/test/Transforms/InstCombine/overflow.ll
+++ b/test/Transforms/InstCombine/overflow.ll
@@ -1,17 +1,24 @@
 ; RUN: opt -S -instcombine < %s | FileCheck %s
 ; <rdar://problem/8558713>
 
+; @LOCALMOD-BEGIN
+; PNaCl does not support the with.overflow intrinsics in its stable
+; ABI, so these optimizations are disabled.
+
+; RUN: opt -S -instcombine < %s | FileCheck %s -check-prefix=PNACL
+; PNACL-NOT: with.overflow
+
 declare void @throwAnExceptionOrWhatever()
 
 ; CHECK: @test1
 define i32 @test1(i32 %a, i32 %b) nounwind ssp {
 entry:
-; CHECK-NOT: sext
+; C;HECK-NOT: sext
   %conv = sext i32 %a to i64
   %conv2 = sext i32 %b to i64
   %add = add nsw i64 %conv2, %conv
   %add.off = add i64 %add, 2147483648
-; CHECK: llvm.sadd.with.overflow.i32
+; C;HECK: llvm.sadd.with.overflow.i32
   %0 = icmp ugt i64 %add.off, 4294967295
   br i1 %0, label %if.then, label %if.end
 
@@ -20,9 +27,9 @@ if.then:
   br label %if.end
 
 if.end:
-; CHECK-NOT: trunc
+; C;HECK-NOT: trunc
   %conv9 = trunc i64 %add to i32
-; CHECK: ret i32
+; C;HECK: ret i32
   ret i32 %conv9
 }
 
@@ -86,7 +93,7 @@ entry:
   %add4 = add nsw i32 %add, 128
   %cmp = icmp ugt i32 %add4, 255
   br i1 %cmp, label %if.then, label %if.end
-; CHECK: llvm.sadd.with.overflow.i8
+; C;HECK: llvm.sadd.with.overflow.i8
 if.then:                                          ; preds = %entry
   tail call void @throwAnExceptionOrWhatever() nounwind
   unreachable
@@ -98,7 +105,7 @@ if.end:                                           ; preds = %entry
 }
 
 ; CHECK: @test5
-; CHECK: llvm.uadd.with.overflow
+; C;HECK: llvm.uadd.with.overflow
 ; CHECK: ret i64
 define i64 @test5(i64 %a, i64 %b) nounwind ssp {
 entry:
@@ -109,7 +116,7 @@ entry:
 }
 
 ; CHECK: @test6
-; CHECK: llvm.uadd.with.overflow
+; C;HECK: llvm.uadd.with.overflow
 ; CHECK: ret i64
 define i64 @test6(i64 %a, i64 %b) nounwind ssp {
 entry:
@@ -120,7 +127,7 @@ entry:
 }
 
 ; CHECK: @test7
-; CHECK: llvm.uadd.with.overflow
+; C;HECK: llvm.uadd.with.overflow
 ; CHECK: ret i64
 define i64 @test7(i64 %a, i64 %b) nounwind ssp {
 entry:
@@ -153,3 +160,5 @@ if.end:
   %conv9 = trunc i64 %add to i32
   ret i32 %conv9
 }
+
+; @LOCALMOD-END