[ia64] code generation error

[llvmbot]

Bugzilla Link	2617
Resolution	LATER
Resolved on	Oct 16, 2008 01:17
Version	unspecified
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@asl

Extended Description

The following fails on the ia64 with llc -march ia64:

; ModuleID = 't0039.ubc'

define i32 @​main(...) {
entry:
%retval = alloca i32 ; <i32*> [#uses=2]
store i32 0, i32* %retval
%fn = alloca void ()* ; <void ()> [#uses=2]
%f = alloca [1 x void ()] ; <[1 x void ()]> [#uses=1]
getelementptr [1 x void ()]* %f, i32 0, i32 1 ; <void ()>:0 [#uses=1]
bitcast void ()** %0 to void ()* ; <void ()>:1 [#uses=1]
store void () %1, void ()** %fn
load void ()** %fn ; <void ()*>:2 [#uses=1]
call void %2( )
br label %return

return: ; preds = %entry
load i32* %retval ; :3 [#uses=1]
ret i32 %3
}

[~/ellcc/ellcc] main% llc -f -march ia64 t0039.ubc
llc: /home/rich/llvm-trunk-new/lib/Target/TargetRegisterInfo.cpp:72: const llvm::TargetRegisterClass* llvm::TargetRegisterInfo::getPhysicalRegisterRegClass(unsigned int, llvm::MVT) const: Assertion `false && "Couldn't find the register class"' failed.
llc[0x8b5105e]
...

[llvmbot]

The itanium backend needs some love, it isn't modelling branch registers correctly, which is confusing recent changes in the register allocator.

[lattner]

I don't think this bug is useful. The IA64 target has serious problems and this is just the tip of the iceburg. I changed the llc --help output to list it as experimental.