Chris Lattner 3fe6c1d389 Legalize is no longer limited to cleverness with just constant shift amounts. ... Allow it to be clever when possible and fall back to the gross code when needed. This allows us to compile: long long foo1(long long X, int C) { return X << (C|32); } long long foo2(long long X, int C) { return X << (C&~32); } to: _foo1: rlwinm r2, r5, 0, 27, 31 slw r3, r4, r2 li r4, 0 blr .globl _foo2 .align 4 _foo2: rlwinm r2, r5, 0, 27, 25 subfic r5, r2, 32 slw r3, r3, r2 srw r5, r4, r5 or r3, r3, r5 slw r4, r4, r2 blr instead of: _foo1: ori r2, r5, 32 subfic r5, r2, 32 addi r6, r2, -32 srw r5, r4, r5 slw r3, r3, r2 slw r6, r4, r6 or r3, r3, r5 slw r4, r4, r2 or r3, r3, r6 blr .globl _foo2 .align 4 _foo2: rlwinm r2, r5, 0, 27, 25 subfic r5, r2, 32 addi r6, r2, -32 srw r5, r4, r5 slw r3, r3, r2 slw r6, r4, r6 or r3, r3, r5 slw r4, r4, r2 or r3, r3, r6 blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30507 91177308-0d34-0410-b5e6-96231b3b80d8		2006-09-20 03:47:40 +00:00
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CodeGen	Expand 64-bit shifts more optimally if we know that the high bit of the	2006-09-20 03:38:48 +00:00
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Target	Legalize is no longer limited to cleverness with just constant shift amounts.	2006-09-20 03:47:40 +00:00
Transforms	Back out Chris' last set of changes. This breaks 177.mesa and povray somehow.	2006-09-20 01:39:40 +00:00
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