[commit: ghc] master: CodeGen: Teach CodeGen about aliasing of XMM/YMM/ZMM registers (139ef7e)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/139ef7e19194c8396bb857df83fdd6bbe9ff3283/ghc

>---------------------------------------------------------------

commit 139ef7e19194c8396bb857df83fdd6bbe9ff3283
Author: Ben Gamari <bgamari.foss at gmail.com>
Date:   Mon Oct 1 15:13:32 2018 +0200

    CodeGen: Teach CodeGen about aliasing of XMM/YMM/ZMM registers
    
    Reviewers: simonmar
    
    Reviewed By: simonmar
    
    Subscribers: rwbarton, carter
    
    Differential Revision: https://phabricator.haskell.org/D5186


>---------------------------------------------------------------

139ef7e19194c8396bb857df83fdd6bbe9ff3283
 includes/CodeGen.Platform.hs | 66 +++++++++++++++++++++++---------------------
 1 file changed, 34 insertions(+), 32 deletions(-)

diff --git a/includes/CodeGen.Platform.hs b/includes/CodeGen.Platform.hs
index 868608a..8e93690 100644
--- a/includes/CodeGen.Platform.hs
+++ b/includes/CodeGen.Platform.hs
@@ -48,6 +48,8 @@ import Reg
 # define fake4 20
 # define fake5 21
 
+-- N.B. XMM, YMM, and ZMM are all aliased to the same hardware registers hence
+-- being assigned the same RegNos.
 # define xmm0  24
 # define xmm1  25
 # define xmm2  26
@@ -65,39 +67,39 @@ import Reg
 # define xmm14 38
 # define xmm15 39
 
-# define ymm0  40
-# define ymm1  41
-# define ymm2  42
-# define ymm3  43
-# define ymm4  44
-# define ymm5  45
-# define ymm6  46
-# define ymm7  47
-# define ymm8  48
-# define ymm9  49
-# define ymm10 50
-# define ymm11 51
-# define ymm12 52
-# define ymm13 53
-# define ymm14 54
-# define ymm15 55
+# define ymm0  24
+# define ymm1  25
+# define ymm2  26
+# define ymm3  27
+# define ymm4  28
+# define ymm5  29
+# define ymm6  30
+# define ymm7  31
+# define ymm8  32
+# define ymm9  33
+# define ymm10 34
+# define ymm11 35
+# define ymm12 36
+# define ymm13 37
+# define ymm14 38
+# define ymm15 39
 
-# define zmm0  56
-# define zmm1  57
-# define zmm2  58
-# define zmm3  59
-# define zmm4  60
-# define zmm5  61
-# define zmm6  62
-# define zmm7  63
-# define zmm8  64
-# define zmm9  65
-# define zmm10 66
-# define zmm11 67
-# define zmm12 68
-# define zmm13 69
-# define zmm14 70
-# define zmm15 71
+# define zmm0  24
+# define zmm1  25
+# define zmm2  26
+# define zmm3  27
+# define zmm4  28
+# define zmm5  29
+# define zmm6  30
+# define zmm7  31
+# define zmm8  32
+# define zmm9  33
+# define zmm10 34
+# define zmm11 35
+# define zmm12 36
+# define zmm13 37
+# define zmm14 38
+# define zmm15 39
 
 -- Note: these are only needed for ARM/ARM64 because globalRegMaybe is now used in CmmSink.hs.
 -- Since it's only used to check 'isJust', the actual values don't matter, thus