llvm-project/llvm/test/CodeGen/X86/shrink-fp-const1.ll

; RUN: llc < %s -mtriple=x86_64-- -mattr=+sse2 | not grep cvtss2sd
; PR1264

define double @foo(double %x) {
        %y = fmul double %x, 5.000000e-01
        ret double %y
}
X86: Do not use llc -march in tests. `llc -march` is problematic because it only switches the target architecture, but leaves the operating system unchanged. This occasionally leads to indeterministic tests because the OS from LLVM_DEFAULT_TARGET_TRIPLE is used. However we can simply always use `llc -mtriple` instead. This changes all the tests to do this to avoid people using -march when they copy and paste parts of tests. See also the discussion in https://reviews.llvm.org/D35287 llvm-svn: 309774 2017-08-02 08:28:10 +08:00			`; RUN: llc < %s -mtriple=x86_64-- -mattr=+sse2 \| not grep cvtss2sd`
Add a target lowering hook to control whether it's worthwhile to compress fp constant. For x86, if sse2 is available, it's not a good idea since cvtss2sd is slower than a movsd load and it prevents load folding. On x87, it's important to shrink fp constant since fldt is very expensive. llvm-svn: 47931 2008-03-05 09:30:59 +08:00			`; PR1264`

			`define double @foo(double %x) {`
Split the Add, Sub, and Mul instruction opcodes into separate integer and floating-point opcodes, introducing FAdd, FSub, and FMul. For now, the AsmParser, BitcodeReader, and IRBuilder all preserve backwards compatability, and the Core LLVM APIs preserve backwards compatibility for IR producers. Most front-ends won't need to change immediately. This implements the first step of the plan outlined here: http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt llvm-svn: 72897 2009-06-05 06:49:04 +08:00			`%y = fmul double %x, 5.000000e-01`
Add a target lowering hook to control whether it's worthwhile to compress fp constant. For x86, if sse2 is available, it's not a good idea since cvtss2sd is slower than a movsd load and it prevents load folding. On x87, it's important to shrink fp constant since fldt is very expensive. llvm-svn: 47931 2008-03-05 09:30:59 +08:00			`ret double %y`
			`}`