4 Commits

Author	SHA1	Message	Date
Nadav Rotem	71d07ae5cb	1. Remove the part of r153848 which optimizes shuffle-of-shuffle into a new ... shuffle node because it could introduce new shuffle nodes that were not supported efficiently by the target. 2. Add a more restrictive shuffle-of-shuffle optimization for cases where the second shuffle reverses the transformation of the first shuffle. llvm-svn: 154266	2012-04-07 21:19:08 +00:00
Nadav Rotem	269703f983	Add an additional testcase which checks ops with multiple users. ... llvm-svn: 153939	2012-04-03 07:39:36 +00:00
Nadav Rotem	702f080767	Optimizing swizzles of complex shuffles may generate additional complex shuffles. ... Do not try to optimize swizzles of shuffles if the source shuffle has more than a single user, except when the source shuffle is also a swizzle. llvm-svn: 153864	2012-04-02 07:11:12 +00:00
Nadav Rotem	b078350872	This commit contains a few changes that had to go in together. ... 1. Simplify xor/and/or (bitcast(A), bitcast(B)) -> bitcast(op (A,B)) (and also scalar_to_vector). 2. Xor/and/or are indifferent to the swizzle operation (shuffle of one src). Simplify xor/and/or (shuff(A), shuff(B)) -> shuff(op (A, B)) 3. Optimize swizzles of shuffles: shuff(shuff(x, y), undef) -> shuff(x, y). 4. Fix an X86ISelLowering optimization which was very bitcast-sensitive. Code which was previously compiled to this: movd (%rsi), %xmm0 movdqa .LCPI0_0(%rip), %xmm2 pshufb %xmm2, %xmm0 movd (%rdi), %xmm1 pshufb %xmm2, %xmm1 pxor %xmm0, %xmm1 pshufb .LCPI0_1(%rip), %xmm1 movd %xmm1, (%rdi) ret Now compiles to this: movl (%rsi), %eax xorl %eax, (%rdi) ret llvm-svn: 153848	2012-04-01 19:31:22 +00:00