http://llvm.org/bugs/show_bug.cgi?id=16334
Bug ID: 16334
Summary: NVPTX generates PTX that prevent the driver to use
certain instructions
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: llc
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 10681
--> http://llvm.org/bugs/attachment.cgi?id=10681&action=edit
Repro
NVPTX generates code that hinders the compute compiler to generate certain,
optimized instructions, like ISCADD.
The attached kernel (cmplx_mul_ir_builder.ll) compiles with libnvvm and the
compute compiler to
/*0038*/ @P0 ISCADD R6, R0, c[0x0][0x14c], 0x2; /*
0x60c008002980001a */
/*
0x08a0bc8c8c10a010 */
/*0048*/ @P0 ISCADD R7, R0, c[0x0][0x148], 0x2; /*
0x60c008002900001e */
/*0050*/ @P0 LD R5, [R6]; /*
0xc400000000001814 */
/*0058*/ @P0 ISCADD R0, R0, c[0x0][0x144], 0x2; /*
0x60c0080028800002 */
/*0060*/ @P0 LD R4, [R7]; /*
0xc400000000001c10 */
Whereas NVPTX generates code that the driver compiles to
/*0048*/ @P0 IADD R6, R0, 0x1000; /*
0xc080000800000019 */
/*0050*/ @P0 IMAD R8.CC, R0, R7, c[0x0][0x150]; /*
0x910c1c002a000022 */
/*0058*/ @P0 IMAD.HI.X R9, R0, R7, c[0x0][0x154]; /*
0x93181c002a800026 */
/*0060*/ @P0 IMAD R14.CC, R6, R7, c[0x0][0x150]; /*
0x910c1c002a00183a */
/*0068*/ @P0 LD.E R2, [R8]; /*
0xc480000000002008 */
This might be just another symptom of bug 16333 or it is unrelated.
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