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4 Commits

Author SHA1 Message Date
Kang Zhang 86e3abc9e6 [PowerPC] Add some InstAlias definitions 
Summary:
This patch add the InstAlias definitions for below instructions.

ADDI ADDIS ADDI8 ADDIS8
RLWINM8
ISEL ISEL8
OR OR_rec ORI ORI8 XORI8
CNTLZW8 CNTLZW8_rec
TEND TSR
RFEBB
NOR NOR_rec
MTCRF
SUBF SUBF_rec SUBFC SUBFC_rec
RLDICL_32_64
TW

Reviewed By: steven.zhang

Differential Revision: https://reviews.llvm.org/D77559
 2020-05-24 14:05:28 +00:00
Yi-Hong Lyu 6bbfafd037 [CGP] Make ICMP_EQ use CR result of ICMP_S(L|G)T dominators 
For example:

long long test(long long a, long long b) {
  if (a << b > 0)
    return b;
  if (a << b < 0)
    return a;
  return a*b;
}

Produces:

        sld. 5, 3, 4
        ble 0, .LBB0_2
        mr 3, 4
        blr
.LBB0_2:                                # %if.end
        cmpldi  5, 0
        li 5, 1
        isel 4, 4, 5, 2
        mulld 3, 4, 3
        blr

But the compare (cmpldi 5, 0) is redundant and can be removed (CR0 already
contains the result of that comparison).

The root cause of this is that LLVM converts signed comparisons into equality
comparison based on dominance. Equality comparisons are unsigned by default, so
we get either a record-form or cmp (without the l for logical) feeding a cmpl.
That is the situation we want to avoid here.

Differential Revision: https://reviews.llvm.org/D60506
 2019-11-11 17:28:50 +00:00
Yi-Hong Lyu 6088f84398 [NFC][CGP] Tests for making ICMP_EQ use CR result of ICMP_S(L|G)T dominators 
llvm-svn: 373876
 2019-10-07 05:29:11 +00:00
Nemanja Ivanovic 80808ed0f6 [PowerPC][NFC] Add test for D60506 to show differences in code-gen 
Differential revision: https://reviews.llvm.org/D61723

llvm-svn: 360338
 2019-05-09 12:26:39 +00:00