Chris Lattner 784f333aef Add an instcombine to clean up a common pattern produced ... by the SRoA "promote to large integer" code, eliminating some type conversions like this: %94 = zext i16 %93 to i32 ; <i32> [#uses=2] %96 = lshr i32 %94, 8 ; <i32> [#uses=1] %101 = trunc i32 %96 to i8 ; <i8> [#uses=1] This also unblocks other xforms from happening, now clang is able to compile: struct S { float A, B, C, D; }; float foo(struct S A) { return A.A + A.B+A.C+A.D; } into: _foo: ## @foo ## BB#0: ## %entry pshufd $1, %xmm0, %xmm2 addss %xmm0, %xmm2 movdqa %xmm1, %xmm3 addss %xmm2, %xmm3 pshufd $1, %xmm1, %xmm0 addss %xmm3, %xmm0 ret on x86-64, instead of: _foo: ## @foo ## BB#0: ## %entry movd %xmm0, %rax shrq $32, %rax movd %eax, %xmm2 addss %xmm0, %xmm2 movapd %xmm1, %xmm3 addss %xmm2, %xmm3 movd %xmm1, %rax shrq $32, %rax movd %eax, %xmm0 addss %xmm3, %xmm0 ret This seems pretty close to optimal to me, at least without using horizontal adds. This also triggers in lots of other code, including SPEC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112278 91177308-0d34-0410-b5e6-96231b3b80d8		2010-08-27 18:31:05 +00:00
..
CMakeLists.txt	split and/or/xor out into one overly-large (2000LOC) file. However, I think	2010-01-05 07:50:36 +00:00
InstCombine.h	Reapply r110396, with fixes to appease the Linux buildbot gods.	2010-08-06 18:33:48 +00:00
InstCombineAddSub.cpp	Floating-point add, sub, and mul are now spelled fadd, fsub, and fmul,	2010-03-02 01:11:08 +00:00
InstCombineAndOrXor.cpp	Re-apply the infamous r108614, with a fix pointed out by Dirk Steinke.	2010-08-02 09:32:13 +00:00
InstCombineCalls.cpp	PR7853: fix a silly mistake introduced in r101899, and add a test to make sure	2010-08-09 20:49:43 +00:00
InstCombineCasts.cpp	Add an instcombine to clean up a common pattern produced	2010-08-27 18:31:05 +00:00
InstCombineCompares.cpp	PR7750: !CExpr->isNullValue() only properly computes whether CExpr is nonnull	2010-07-29 18:03:33 +00:00
InstCombineLoadStoreAlloca.cpp	Re-apply r111568 with a fix for the clang self-host.	2010-08-20 18:24:43 +00:00
InstCombineMulDivRem.cpp	Floating-point add, sub, and mul are now spelled fadd, fsub, and fmul,	2010-03-02 01:11:08 +00:00
InstCombinePHI.cpp	cache result of operator*	2010-07-12 14:15:58 +00:00
InstCombineSelect.cpp	Remove the rest of my instcombine changes. Back to the drawing board on this one.	2010-07-16 16:39:00 +00:00
InstCombineShifts.cpp	use ArgOperand API	2010-06-24 00:44:01 +00:00
InstCombineSimplifyDemanded.cpp	use ArgOperand API	2010-06-28 16:45:00 +00:00
InstCombineVectorOps.cpp	Temporarily revert r110987 as it's causing some miscompares in	2010-08-17 22:55:27 +00:00
InstCombineWorklist.h	I got tired of VISIBILITY_HIDDEN colliding with the gcc enum. Rename it	2010-05-11 20:16:09 +00:00
InstructionCombining.cpp	Fix batch of converting RegisterPass<> to INTIALIZE_PASS().	2010-07-21 22:09:45 +00:00
Makefile	make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.	2010-01-24 20:43:08 +00:00