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Fixed x86-64 optimization flags for clang (#13913)

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* Fixed x86-64 optimization flags for clang
* Fixed expected results in unit tests

Before the flags used where the one for llc, the underlying compiler from LLVM IR to machine assembly. It turns out that the semantic of `-march`, `-mtune` and `-mcpu` changes from clang front-end to llc.

I found no definitive reference for the flags submitted in this PR, but I checked the assembly on a vectorizable function using Godbolt's web-site.
This commit is contained in:
Massimiliano Culpo
2019-12-04 18:11:34 +01:00
committed by Todd Gamblin
parent 728f5a76f3
commit e9f027210f
3 changed files with 32 additions and 53 deletions
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74
lib/spack/llnl/util/cpu/microarchitectures.json
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@@ -64,13 +64,13 @@
"clang": [
{
"versions": "0.0.0-apple:",
"family": "x86-64",
"flags": "-march={family}"
"name": "x86-64",
"flags": "-march={name}"
},
{
"versions": ":",
"family": "x86-64",
"flags": "-march={family} -mcpu=generic"
"name": "x86-64",
"flags": "-march={name} -mtune=generic"
}
],
"intel": {
@@ -96,8 +96,7 @@
},
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -122,8 +121,7 @@
},
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -157,8 +155,7 @@
],
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -188,8 +185,7 @@
},
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -227,8 +223,7 @@
],
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": [
{
@@ -274,8 +269,7 @@
],
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": [
{
@@ -326,8 +320,7 @@
],
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": [
{
@@ -373,8 +366,7 @@
},
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "18.0:",
@@ -416,8 +408,7 @@
},
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "18.0:",
@@ -463,8 +454,7 @@
"clang": {
"versions": "3.9:",
"name": "knl",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "18.0:",
@@ -515,8 +505,7 @@
"clang": {
"versions": "3.9:",
"name": "skylake-avx512",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "18.0:",
@@ -568,8 +557,7 @@
},
"clang": {
"versions": "3.9:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "18.0:",
@@ -618,8 +606,7 @@
},
"clang": {
"versions": "8.0:",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "19.0:",
@@ -685,13 +672,11 @@
{
"versions": "7.0:",
"name": "icelake-client",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
{
"versions": "6.0:6.9",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
}
],
"intel": {
@@ -723,8 +708,7 @@
"clang": {
"versions": "3.9:",
"name": "amdfam10",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -761,8 +745,7 @@
"clang": {
"versions": "3.9:",
"name": "bdver1",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -803,8 +786,7 @@
"clang": {
"versions": "3.9:",
"name": "bdver2",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -846,8 +828,7 @@
"clang": {
"versions": "3.9:",
"name": "bdver3",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -892,8 +873,7 @@
"clang": {
"versions": "3.9:",
"name": "bdver4",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -942,8 +922,7 @@
"clang": {
"versions": "4.0:",
"name": "znver1",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",
@@ -993,8 +972,7 @@
"clang": {
"versions": "9.0:",
"name": "znver2",
"family": "x86-64",
"flags": "-march={family} -mcpu={name}"
"flags": "-march={name} -mtune={name}"
},
"intel": {
"versions": "16.0:",