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The PowerPC 128-bit long double data type (ppcf128 in LLVM) is in fact a pair of two doubles, where one is considered the "high" or more-significant part, and the other is considered the "low" or less-significant part. When a ppcf128 value is stored in memory or a register pair, the high part always comes first, i.e. at the lower memory address or in the lower-numbered register, and the low part always comes second. This is true both on big-endian and little-endian PowerPC systems. (Similar to how with a complex number, the real part always comes first and the imaginary part second, no matter the byte order of the system.) This was implemented incorrectly for little-endian systems in LLVM. This commit fixes three related issues: - When printing an immediate ppcf128 constant to assembler output in emitGlobalConstantFP, emit the high part first on both big- and little-endian systems. - When lowering a ppcf128 type to a pair of f64 types in SelectionDAG (which is used e.g. when generating code to load an argument into a register pair), use correct low/high part ordering on little-endian systems. - In a related issue, because lowering ppcf128 into a pair of f64 must operate differently from lowering an int128 into a pair of i64, bitcasts between ppcf128 and int128 must not be optimized away by the DAG combiner on little-endian systems, but must effect a word-swap. Reviewed by Hal Finkel. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212274 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
1.2 KiB
LLVM
42 lines
1.2 KiB
LLVM
; RUN: llc -mtriple=x86_64-none-linux < %s | FileCheck %s
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; Check that all current floating-point types are correctly emitted to assembly
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; on a little-endian target.
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@var128 = global fp128 0xL00000000000000008000000000000000, align 16
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@varppc128 = global ppc_fp128 0xM80000000000000000000000000000000, align 16
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@var80 = global x86_fp80 0xK80000000000000000000, align 16
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@var64 = global double -0.0, align 8
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@var32 = global float -0.0, align 4
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@var16 = global half -0.0, align 2
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; CHECK: var128:
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; CHECK-NEXT: .quad 0 # fp128 -0
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; CHECK-NEXT: .quad -9223372036854775808
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; CHECK-NEXT: .size
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; CHECK: varppc128:
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; For ppc_fp128, the high double always comes first.
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; CHECK-NEXT: .quad -9223372036854775808 # ppc_fp128 -0
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; CHECK-NEXT: .quad 0
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; CHECK-NEXT: .size
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; CHECK: var80:
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; CHECK-NEXT: .quad 0 # x86_fp80 -0
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; CHECK-NEXT: .short 32768
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; CHECK-NEXT: .zero 6
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; CHECK-NEXT: .size
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; CHECK: var64:
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; CHECK-NEXT: .quad -9223372036854775808 # double -0
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; CHECK-NEXT: .size
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; CHECK: var32:
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; CHECK-NEXT: .long 2147483648 # float -0
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; CHECK-NEXT: .size
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; CHECK: var16:
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; CHECK-NEXT: .short 32768 # half -0
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; CHECK-NEXT: .size
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