diff options
| -rw-r--r-- | lib/CodeGen/RegisterScavenging.cpp | 3 | ||||
| -rw-r--r-- | test/CodeGen/ARM/2009-08-04-RegScavengerAssert.ll | 25 |
2 files changed, 27 insertions, 1 deletions
diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp index e1c8f2fe22..0a29ef02bc 100644 --- a/lib/CodeGen/RegisterScavenging.cpp +++ b/lib/CodeGen/RegisterScavenging.cpp @@ -267,7 +267,8 @@ void RegScavenger::forward() { unsigned UseIdx; if (MI->isRegTiedToUseOperand(Idx, &UseIdx) && !MI->getOperand(UseIdx).isUndef()) { - assert(isUsed(Reg) && "Using an undefined register!"); + assert(!MI->getOperand(UseIdx).isKill() && + "Using an undefined register!"); continue; } diff --git a/test/CodeGen/ARM/2009-08-04-RegScavengerAssert.ll b/test/CodeGen/ARM/2009-08-04-RegScavengerAssert.ll new file mode 100644 index 0000000000..cb274738da --- /dev/null +++ b/test/CodeGen/ARM/2009-08-04-RegScavengerAssert.ll @@ -0,0 +1,25 @@ +; RUN: llvm-as < %s | llc -mtriple=armv6-elf +; PR4528 + +define arm_aapcscc i32 @file_read_actor(i32 %desc, i32 %page, i32 %offset, i32 %size) nounwind optsize { +entry: + br i1 undef, label %fault_in_pages_writeable.exit, label %bb5.i + +bb5.i: ; preds = %entry + %asmtmp.i = tail call i32 asm sideeffect "1:\09strbt\09$1,[$2]\0A2:\0A\09.section .fixup,\22ax\22\0A\09.align\092\0A3:\09mov\09$0, $3\0A\09b\092b\0A\09.previous\0A\09.section __ex_table,\22a\22\0A\09.align\093\0A\09.long\091b, 3b\0A\09.previous", "=r,r,r,i,0,~{cc}"(i8 0, i32 undef, i32 -14, i32 0) nounwind ; <i32> [#uses=1] + br label %fault_in_pages_writeable.exit + +fault_in_pages_writeable.exit: ; preds = %bb5.i, %entry + %0 = phi i32 [ 0, %entry ], [ %asmtmp.i, %bb5.i ] ; <i32> [#uses=1] + %1 = icmp eq i32 %0, 0 ; <i1> [#uses=1] + br i1 %1, label %bb2, label %bb3 + +bb2: ; preds = %fault_in_pages_writeable.exit + unreachable + +bb3: ; preds = %fault_in_pages_writeable.exit + %2 = tail call arm_aapcscc i32 @__copy_to_user(i8* undef, i8* undef, i32 undef) nounwind ; <i32> [#uses=0] + unreachable +} + +declare arm_aapcscc i32 @__copy_to_user(i8*, i8*, i32) |