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Revert "[PowerPC] [Clang] Enable float128 feature on VSX targets" 

This commit brought build break in some f128 related tests. But that's
not the root cause. There exists some differences between Clang and
GCC's definition for 128-bit float types on PPC, so macros/functions in
glibc may not work with clang -mfloat128 well. We need to handle this
carefully and reland it.
This commit is contained in:
Qiu Chaofan 2021-05-12 16:51:52 +08:00
parent 34c098b780
commit cbd93cee9b
2 changed files with 6 additions and 16 deletions
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10
clang/lib/Basic/Targets/PPC.cpp
View File

@ -328,12 +328,6 @@ bool PPCTargetInfo::initFeatureMap(
.Case("pwr9", true)
.Case("pwr8", true)
.Default(false);
Features["float128"] = llvm::StringSwitch<bool>(CPU)
.Case("ppc64le", true)
.Case("pwr9", true)
.Case("pwr8", true)
.Case("pwr7", true)
.Default(false);
// ROP Protect is off by default.
Features["rop-protect"] = false;
@ -362,9 +356,9 @@ bool PPCTargetInfo::initFeatureMap(
if (!ppcUserFeaturesCheck(Diags, FeaturesVec))
return false;
if (!(ArchDefs & ArchDefinePwr7) && (ArchDefs & ArchDefinePpcgr) &&
if (!(ArchDefs & ArchDefinePwr9) && (ArchDefs & ArchDefinePpcgr) &&
llvm::find(FeaturesVec, "+float128") != FeaturesVec.end()) {
// We have __float128 on PPC but not pre-VSX targets.
// We have __float128 on PPC but not power 9 and above.
Diags.Report(diag::err_opt_not_valid_with_opt) << "-mfloat128" << CPU;
return false;
}

12
clang/test/Driver/ppc-f128-support-check.c
View File

@ -2,17 +2,13 @@
// RUN: -mcpu=pwr9 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=HASF128
// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
// RUN: -mcpu=power9 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=HASF128
// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
// RUN: -mcpu=pwr8 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=HASF128
// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
// RUN: -mcpu=pwr7 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=HASF128
// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
// RUN: -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=HASF128
// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
// RUN: -mcpu=pwr6 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128
// RUN: -mcpu=pwr8 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128
// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
// RUN: -mno-vsx -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128
// RUN: -mcpu=pwr7 -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128
// RUN: not %clang -target powerpc64le-unknown-linux-gnu -fsyntax-only \
// RUN: -mfloat128 %s 2>&1 | FileCheck %s --check-prefix=NOF128
#ifdef __FLOAT128__
static_assert(false, "__float128 enabled");