12 Commits

Author	SHA1	Message	Date
Chris Lattner	8b2bc3d574	fix PR5016, a crash I introduced in GVN handing first class ... arrays and structs, which cannot be bitcast to integers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82460 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-21 17:24:04 +00:00
Chris Lattner	4fbd14e80e	enable non-local analysis and PRE of large store -> little load. ... This doesn't kick in too much because of phi translation issues, but this can be resolved in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82447 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-21 06:48:08 +00:00
Chris Lattner	f716330c90	add pr# ... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82440 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-21 05:57:47 +00:00
Chris Lattner	eed919b1ba	Improve GVN to be able to forward substitute a small load ... from a piece of a large store when both are in the same block. This allows clang to compile the testcase in PR4216 to this code: _test_bitfield: movl 4(%esp), %eax movl %eax, %ecx andl $-65536, %ecx orl $32962, %eax andl $40186, %eax orl %ecx, %eax ret This is not ideal, but is a whole lot better than the code produced by llvm-gcc: _test_bitfield: movw $-32574, %ax orw 4(%esp), %ax andw $-25350, %ax movw %ax, 4(%esp) movw 7(%esp), %cx shlw $8, %cx movzbl 6(%esp), %edx orw %cx, %dx movzwl %dx, %ecx shll $16, %ecx movzwl %ax, %eax orl %ecx, %eax ret and dramatically better than that produced by gcc 4.2: _test_bitfield: pushl %ebx call L3 "L00000000001$pb": L3: popl %ebx movl 8(%esp), %eax leal 0(,%eax,4), %edx sarb $7, %dl movl %eax, %ecx andl $7168, %ecx andl $-7201, %ebx movzbl %dl, %edx andl $1, %edx sall $5, %edx orl %ecx, %ebx orl %edx, %ebx andl $24, %eax andl $-58336, %ebx orl %eax, %ebx orl $32962, %ebx movl %ebx, %eax popl %ebx ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82439 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-21 05:57:11 +00:00
Chris Lattner	8111576521	fix a FileCheck bug where: ... ; CHECK: foo ; CHECK-NOT: foo ; CHECK: bar would always fail. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82424 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-21 02:30:42 +00:00
Daniel Dunbar	3d4138bd58	Work around a FileCheck bug, for now. ... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82416 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-20 23:30:31 +00:00
Chris Lattner	66364346e0	Revert r82404, it is causing a bootstrap miscompile. This is very very ... scary, as it indicates a lurking bug. yay. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82411 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-20 22:44:26 +00:00
Chris Lattner	6a089c3257	this was not supposed to be committed ... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82409 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-20 22:36:11 +00:00
Chris Lattner	f15380ba8a	implement and document support for CHECK-NOT ... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82408 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-20 22:35:26 +00:00
Chris Lattner	386251341f	improve memdep to eliminate bitcasts (and aliases, and noop geps) ... early for the stated reasons: this allows it to find more equivalences and depend less on code layout. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82404 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-20 21:00:18 +00:00
Chris Lattner	771a5422e1	Move CoerceAvailableValueToLoadType earlier in GVN.cpp. Hook it up ... so that nonlocal and partially redundant loads can use it as well. The testcase shows examples of craziness this can handle. This triggers *many* times in 176.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82403 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-20 20:09:34 +00:00
Chris Lattner	bb6495cc67	enhance GVN to forward substitute a stored value to a load ... (and load -> load) when the base pointers must alias but when they are different types. This occurs very very frequently in 176.gcc and other code that uses bitfields a lot. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82399 91177308-0d34-0410-b5e6-96231b3b80d8	2009-09-20 19:03:47 +00:00